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QSPR Study on the Glass Transition Temperature of Polyacrylates 被引量:17
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作者 刘天宝 彭艳芬 吴新民 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2007年第12期1466-1470,共5页
Structural parameters of 22 polyacrylic compounds were computed at two levels using Hartree-Fock and DFT methods. Based on the experimental data of glass transition temperature (Tg), four-parameter (energy of the l... Structural parameters of 22 polyacrylic compounds were computed at two levels using Hartree-Fock and DFT methods. Based on the experimental data of glass transition temperature (Tg), four-parameter (energy of the lowest unoccupied molecular orbital (ELoMO), the highest positive charge (Qmax^+), dipole moments(μ) and the next highest occupied molecular orbital (ENLOMO)) dependent equations were developed using structural parameters as theoretical descriptors. Especially, Tg dependent equation calculated at the HF/6-31G(d) level is more advantageous than others in view of their correlation and predictive abilities. This dependent equation was validated by variance inflation factors (VIF) and t-test methods. 展开更多
关键词 glass transition temperature QSPR POLYACRYLATE HARTREE-FOCK DFT
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Mixed Alkali-zinc Effects on Thermo-mechanical Properties in Borosilicate Glasses
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作者 XIAO Guanzhou TAO Yunhang +3 位作者 ZHOU Hemin ZHENG Qingshuang QIAO Ang TAO Haizheng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第5期1093-1099,共7页
A series of mixed alkali-zinc borosilicate glasses with various r values(r=molar ratio of[ZnO]/([R^(2)O]+[ZnO]))from 0.00 to 1.00 were fabricated to probe the mixed alkali-zinc effects on thermo-mechanical properties.... A series of mixed alkali-zinc borosilicate glasses with various r values(r=molar ratio of[ZnO]/([R^(2)O]+[ZnO]))from 0.00 to 1.00 were fabricated to probe the mixed alkali-zinc effects on thermo-mechanical properties.The nonlinear evolution of glass transition temperature(T_(g))with the addition of ZnO is ascribed to the competition of two converse factors,i e,the T_(g)depression as one of the colligative properties for a solution,on the one hand,and the enhancement of T_(g)due to the higher field strength of zinc cations compared to that of alkali ions.However,the nonlinear evolution of elastic moduli and coefficients of thermal expansion with r is attributed to the variance of intermediate-range clusters,which is confirmed by infrared and Raman scattering spectra.These findings are very helpful in tailoring the performance of borosilicate glasses. 展开更多
关键词 glass transition temperature elastic moduli coefficient of thermal expansion borosilicate glass
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POLYMER CHAIN DIFFUSION AT A TEMPERATURE BELOW ITS BULK GLASS TRANSITION TEMPERATURE
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作者 TisatoKajiyama DaisukeKawaguchi +1 位作者 KeijiTanaka TisatoKajiyama 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2003年第2期141-146,共6页
In this study, it was examined whether the dynamics of polymer chains at a surface is different from that in thebulk, and if so, to what extent they differ in terms of surface glass transition temperature and diffusio... In this study, it was examined whether the dynamics of polymer chains at a surface is different from that in thebulk, and if so, to what extent they differ in terms of surface glass transition temperature and diffusion coefficient. Obtainedresults clearly indicate that surface chains can travel for a relatively large distance in comparison with the characteristiclength scale of usual segmental motion even at a temperature below its bulk glass transition temperature, T_g^b. This isconsistent with our previous results that the surface glass transition temperature is much lower than the corresponding T_g^b.Also, it was experimentally revealed that there was a gradient of molecular motion in the surface region. 展开更多
关键词 Surface molecular motion Surface glass transition temperature POLYSTYRENE Poly(styrene-block-methyl methacrylate)
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Effects of C60 on the Glass Transition Temperature of Carbazole-based Photorefractive Polyphosphazenes
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作者 陈百利 CHEN Shufan +5 位作者 LUO Xuan FANG Yu ZHANG Qingjun HUANG Chuanqun DENG Qinghua 吴卫东 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第4期974-979,共6页
The bi-functional carbazole-based photorefractive polyphosphazenes with different content of C_(60)-doped were fabricated. The glass transition temperature(T_g) of these polymer composite materials was determined ... The bi-functional carbazole-based photorefractive polyphosphazenes with different content of C_(60)-doped were fabricated. The glass transition temperature(T_g) of these polymer composite materials was determined using a differential scanning calorimetric(DSC) method. According to the DSC measurement results with different heating rates, the variation of T_g and the active energy of glass transition(E_g) were analyzed in detail. The analysis results indicate that the transition region shifts to higher temperatures with increasing heating rate, and C_(60) content(below 1.0 wt%) can influence the T_g of photorefractive polyphosphazenes. The T_g first increases and then decreases with the C_(60) content(below 1.0 wt%). The probable causes of the influence of C_(60) on T_g was proposed. 展开更多
关键词 differential scanning calorimetric (DSC) fullerene C60 carbazole-based photorefractivepolyphosphazenes glass transition temperature (Tg) active energy of glass transition (Eg)
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Creep performance of PVC aged at temperature relatively close to glass transition temperature
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作者 周志红 贺耀龙 +2 位作者 胡宏玖 赵峰 张晓龙 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2012年第9期1129-1136,共8页
In order to predict the mechanical performance of the polyvinyl chloride (PVC) at a high operating temperature, a series of short-term tensile creep tests (one- tenth of the physical aging time) of the PVC are car... In order to predict the mechanical performance of the polyvinyl chloride (PVC) at a high operating temperature, a series of short-term tensile creep tests (one- tenth of the physical aging time) of the PVC are carried out at 63 ℃ with a small constant stress by a dynamic mechanical analyzer (DMA). The Struik-Kohlrausch (SK) formula and Struik shifting methods are used to describe these creep data for various physical aging time. A new phenomenological model based on the multiple relaxation mechanisms of an amorphous polymer is developed to quantitatively characterize the SK parameters (the initial creep compliance, the characteristic retardation time, and the shape factor) determined by the aging time. It is shown that the momentary creep compliance curve of the PVC at 63℃ can be very well fitted by the SK formula for each aging time. However, the SK parameters for the creep curves are not constant during the aging process at the elevated temperatures, and the evolution of these parameters and the creep rate versus aging time curves at the double logarithmic coordinafes have shown a nonlinear phenomenon. Moreover, the creep master curves obtained by the superposition with the Struik shifting methods are unsatisfactory in such a case. Finally, the predicted results calculated from the present model incorporating with the SK formula are in excellent agreement with the creep experimental data for the PVC isothermally aged at the temperature relatively close to the glass transition temperature. 展开更多
关键词 physical aging polyvinyl chloride (PVC) glass transition temperature creep
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Prediction of Glass Transition Temperatures of Polyarylates Using a Support Vector Machine Model
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作者 张仕华 谭正德 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第7期943-950,共8页
A three-descriptor quantitative structure-property relationship (QSPR) model, based on the support vector machine (SVM) algorithm, was constructed to predict the glass transition temperatures (Tgs) ofpolyarylate... A three-descriptor quantitative structure-property relationship (QSPR) model, based on the support vector machine (SVM) algorithm, was constructed to predict the glass transition temperatures (Tgs) ofpolyarylates with complex structures. A total of 50 polyarylates were randomly divided into three sets, viz., the training set (30 polymers), validation set (10 polymers) and prediction set (10 polymers). By adjusting various parameters by trial and error, the final optimum SVM model based on Austin Model 1 (AM1) calculation is a polynomial kernel with the parameters C of 100, ε of 1.00E-05 and d of 2. The root-mean-square (RMS) errors obtained from the training set, validation set and prediction set are 19.4, 12.8 and 15.5 K, respectively. Research results show that the proposed SVM model has better statistical quality than the previous models. Thus, applying the SVM algorithm to predict Tgs of polymers is feasible. 展开更多
关键词 glass transition temperature structure-property relations support vector machine
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A NEURAL NETWORK STUDY ON GLASS TRANSITION TEMPERATURE OF POLYMERS
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作者 章林溪 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2002年第1期25-30,共6页
In this paper, an artificial neural network model is adopted to study the glass transition temperature of polymers. In our artificial neural networks, the input nodes are the characteristic ratio C-infinity, the avera... In this paper, an artificial neural network model is adopted to study the glass transition temperature of polymers. In our artificial neural networks, the input nodes are the characteristic ratio C-infinity, the average molecular weight M-e between entanglement points and the molecular weight M-mon of repeating unit. The output node is the glass transition temperature T-g, and the number of the hidden layer is 6. We found that the artificial neural network simulations are accurate in predicting the outcome for polymers for which it is not trained. The maximum relative error for predicting of the glass transition temperature is 3.47%, and the overall average error is only 2.27%. Artificial neural networks may provide some new ideas to investigate other properties of the polymers. 展开更多
关键词 neural network glass transition temperature
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High temperature strain glass in Ti–Au and Ti–Pt based shape memory alloys 被引量:1
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作者 Shuai Ren Chang Liu Wei-Hua Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第1期109-113,共5页
Strain glass is a frozen short-range strain ordered state found in shape memory alloys recently, which exhibits novel properties around the ideal glass transition temperature T_(0). However, the T_(0) of current strai... Strain glass is a frozen short-range strain ordered state found in shape memory alloys recently, which exhibits novel properties around the ideal glass transition temperature T_(0). However, the T_(0) of current strain glass systems is still very low, limiting their potential applications and experimental studies. In this paper, we reported two new strain glass systems with relatively high T_(0). In Ti_(50)Au_(50-x)Cr_(x) alloys, the strain glass appears at x = 25, and exhibits a T_(0) of 251 K, while in Ti_(50)Pt_(50-y)Fey alloys, the strain glass takes place at y = 30, and shows a T_(0) of 272 K. Both of them are comparable with the highest T_(0) value reported so far. Moreover, the phase diagrams of main strain glass systems in Ti-based alloys were summarized. It is found that the influence of the martensitic transformation temperature of the host alloy on the T_(0) of the strain glass is limited. This work may help to design new strain glass systems with higher T_(0) above ambient temperature. 展开更多
关键词 shape memory alloys martensitic transformation strain glass glass transition temperature
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Understanding the alkyl effect of geminal dinitropropyl ester energetic plasticizers on hydroxyl terminated polybutadiene(HTPB):Simultaneous tuning on low temperature behavior and processability 被引量:2
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作者 Baodong Zhao Yinglei Wang +3 位作者 Fulei Gao Yajing Liu Weixiao Liu Feng Ding 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第2期364-371,共8页
Geminal dinitropropyl ester plasticizers(DNPEPs) possess excellent energetic performances which provide good potentials as insensitive plasticizer. In this study, we design and synthesize DNPEPs with different alkane ... Geminal dinitropropyl ester plasticizers(DNPEPs) possess excellent energetic performances which provide good potentials as insensitive plasticizer. In this study, we design and synthesize DNPEPs with different alkane chain parts, and systematically investigate their structure-property relationships.Results show that DNPEPs have impact sensitivities all higher than 25.2 J, thermal decomposition temperatures all higher than 254 ℃, and glass transition temperatures(T_(g)) lower than-90 ℃.Furthermore, the effects of DNPEPs as plasticizer are studied on hydroxyl terminated polybutadiene(HTPB) in detail, including the viscosity, glass transition temperatures and others. It is noteworthy that 2,2-dinitropropyl nonanoate(DNPNc) among these DNPEPs exhibits the most expected simultaneous tuning effects on both viscosity and T_(g) of HTPB systems, providing favorable potentials to replace the conventional plastizers as dioctyl sebacate(DOS) in the HTPB based propellants and explosives. 展开更多
关键词 Molecular simulation Experimental validation Preparation Energetic plasticizer glass transition temperature Viscosity
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Molecular Dynamics Simulation of Glass Transition Behavior of Polyimide Ensemble
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作者 Tai Ning LIANG Xiang Yu ZHANG Xiao Zhen YANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2001年第9期827-828,共2页
The effect of chromophores to the glass transition temperature of polyimide ensemble has been investigated by means of molecular dynamics simulation in conjunction with barrier analysis. Simulated Tg results indicated... The effect of chromophores to the glass transition temperature of polyimide ensemble has been investigated by means of molecular dynamics simulation in conjunction with barrier analysis. Simulated Tg results indicated a good agreement with experimental value. This study showed the MD simulation could estimate the effect of chromophores to the Tg of polyimide ensemble conveniently and an estimation approach method had a surprising deviation of Tg from experiment. At the same time, a polyimide structure with higher barrier energy was designed and validated by MD simulation. 展开更多
关键词 glass transition temperature molecular dynamics simulation
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Anti-cracking mechanism of diatomite asphalt and diatomite asphalt mixture at low temperature 被引量:8
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作者 谭忆秋 单丽岩 +1 位作者 房军 张兴友 《Journal of Southeast University(English Edition)》 EI CAS 2009年第1期74-78,共5页
A kind of neat asphalt and three kinds of diatomite asphalt are tested using differential scanning calorimetry(DSC). The anti-cracking mechanism of diatomite asphalt is analyzed by DSC and the thermal stress restrai... A kind of neat asphalt and three kinds of diatomite asphalt are tested using differential scanning calorimetry(DSC). The anti-cracking mechanism of diatomite asphalt is analyzed by DSC and the thermal stress restrained specimen test(TSRST) of the asphalt mixtures. The results show that the low temperature performance of diatomite asphalt is better than that of neat asphalt. The glass transition temperature can reflect the low temperature performance of the diatomite asphalt better and has a good relationship with breaking temperatures. Besides, the TSRST, the bending test, the compressing test and the contraction coefficient test are used to study the low temperature performance of the diatomite asphalt mixture. The results prove that the low temperature performance of the diatomite asphalt mixture is better than that of the neat asphalt mixture. The critical bending strain energy density and the compressing strain energy density of the diatomite asphalt mixture are greater than those of the neat asphalt mixture. After adding diatomite to the asphalt mixture, the contraction coefficient is reduced. Based on the above results, the anti-cracking mechanism of the diatomite asphalt mixture is analyzed from the angle of contraction performance and breaking energy. 展开更多
关键词 diatomite asphalt low temperature performance glass transition temperature differential scanning calorimetry anticracking mechanism
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Physical and Thermal Properties of P_2O_5-Al_2O_3-BaO-La_2O_3 Glasses 被引量:1
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作者 YangLI JianhuYANG +2 位作者 ShiqingXU GuonianWANG LiliHU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第3期391-394,共4页
The physical and thermal properties of P2O5-Al2O3-BaO-La2O3 glasses were investigated. The effects of glass compositions on the transition temperature, thermal expansion coefficient, density, hardness and refractive i... The physical and thermal properties of P2O5-Al2O3-BaO-La2O3 glasses were investigated. The effects of glass compositions on the transition temperature, thermal expansion coefficient, density, hardness and refractive index of glasses were studied. The highest hardness of the glasses is 4143.891 MPa and the lowest thermal expansion coefficient of the glasses is 71.770×10-7/℃. A phosphate glass with high mechanical strength and good thermal characteristic is obtained. 展开更多
关键词 glass transition temperature Thermal expansion coefficient Density HARDNESS Refractive index
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Formation and thermal stability of Cu-Zr-Al-Er bulk metallic glasses with high glass-forming ability 被引量:1
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作者 Junying Fu, Hua Men, Shujie Pang, Chaoli Ma, and Tao Zhang Department of Materials Science and Engineering, Behang University, Beijing 100083, China 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2007年第S1期36-38,共3页
The formation and thermal stabilities of Cu46.25Zr46.25xAl7.5Erx (x=0 to 8) bulk metallic glasses (BMGs) were investigated. The addition of a small amount of Er (2at%) for replacing Zr effectively improves the glass-f... The formation and thermal stabilities of Cu46.25Zr46.25xAl7.5Erx (x=0 to 8) bulk metallic glasses (BMGs) were investigated. The addition of a small amount of Er (2at%) for replacing Zr effectively improves the glass-forming ability of Cu46.25Zr46.25Al7.5 alloy, and the glassy rod with a diameter of at least 12 mm can be formed. The glass transition temperature (Tg), temperature interval of su- percooled liquid region △Tx (=Tx-Tg), and reduced glass transition temperature Trg (=Tg/Tl) of Cu46.25Zr44.25Al7.5Er2 glassy alloy are 699 K, 62 K and 0.607, respectively. 展开更多
关键词 Cu-based alloy bulk metallic glass glass-forming ability glass transition temperature ERBIUM
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The abnormal behavior of polymers glass transition temperature increase and its mechanism 被引量:2
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作者 WANG Xiang QI GuiCun +4 位作者 ZHANG XiaoHong GAO JianMing LI BingHai SONG ZhiHai QIAO JinLiang 《Science China Chemistry》 SCIE EI CAS 2012年第5期713-717,共5页
In terms of the classical theory in textbooks, the two components with phase separation in a binary polymer blend will, depending on their compatibility, have their respective Tg get closer or remain in their original... In terms of the classical theory in textbooks, the two components with phase separation in a binary polymer blend will, depending on their compatibility, have their respective Tg get closer or remain in their original values. According to the classical theory, the Tg of plastic component shall remain unchanged or move toward the lower Tg of rubber component in a rubber/plastic blend. However, ultra-fine full-vulcanized powdered rubber (UFPR) with a diameter of ca. 100 nm can simultaneously increase the toughness and the Tg of plastics, which is abnormal and is difficult to explain by classical theory. In this feature article, the abnormal behavior and its mechanism are discussed in detail. 展开更多
关键词 rubber/plastic blend glass transition temperature ultra-fine full-vulcanized powdered rubber (UFPR) MECHANISM INTERFACE
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Molecular Dynamics Simulation of the Glass Transition Temperature of Fullerene Filled Cis-1,4-polybutadiene Nanocomposites 被引量:2
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作者 Yang-Yang Gao Feng-Yan Hu +1 位作者 Jun Liu Zhao Wang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2018年第1期119-128,共10页
In this work, the effect of the fullerene(C_(60)) weight fraction and PB-C_(60) interaction on the glass transition temperature(T_g) of polymer chains has been systemically investigated by adopting the united ... In this work, the effect of the fullerene(C_(60)) weight fraction and PB-C_(60) interaction on the glass transition temperature(T_g) of polymer chains has been systemically investigated by adopting the united atom model of cis-1,4-poly(butadiene)(cis-PB). Various chain dynamics properties, such as atom translational mobility, bond/segment reorientation dynamics, torsional dynamics, conformational transition rate and dynamic heterogeneity of the cis-PB chains, are analyzed in detail. It is found that T_g could be affected by the C_(60) weight fraction due to its inhibition effect on the mobility of the cis-PB chains. However, T_g is different, which depends on different dynamics scales. Among the chain dynamics properties, T_g is the lowest from atom translational mobility, while it is the highest from the dynamic heterogeneity. In addition, T_g can be more clearly distinguished from the dynamic heterogeneity; however, the conformational transition rate seems to be not very sensitive to the C_(60) weight fraction compared with others. For pure cis-PB chains, T_g and the activation energy in this work can be compared with those of other polymers. In addition, the temperature dependence of the dynamic properties has different Arrhenius behaviors above and below T_g. The activation energy below T_g is lower than that above T_g. This work can help to understand the effect of the C_(60) on the dynamic properties and glass transition temperature of the cis-PB chains from different scales. 展开更多
关键词 glass transition temperature Fullerene Cis-1 4-polybutadiene Molecular dynamics simulation
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An accelerated method to evaluate thymopentin release from microspheres in vitro 被引量:2
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作者 艾国 梅兴国 《Journal of Chinese Pharmaceutical Sciences》 CAS 2008年第1期41-45,共5页
To design an accelerated method to evaluate thymopentin release from PLGA microspheres in vitro. Microspheres were prepared by double emulsion technique, using poly(lactide-co-glycolide) (PLGA) as carrier. At high... To design an accelerated method to evaluate thymopentin release from PLGA microspheres in vitro. Microspheres were prepared by double emulsion technique, using poly(lactide-co-glycolide) (PLGA) as carrier. At higher medium temperature (45℃, 50℃ and 55℃), an accelerated release testing in short time was studied and correlated with the conventional release (37℃) in vitro. The release in vitro of thymopentin from PLGA microspheres at 45 ℃, 50℃ and 55℃ was significantly accelerated (P 〈 0.05). In particular, at 50℃, an accelerated release (30 h) of the hydrophilic peptide from the PLGA matrix was achieved and correlated well with the conventional release (30 d). An accelerated release testing in vitro at higher temperature could be used to monitor thymopentin release from PLGA microspheres. 展开更多
关键词 THYMOPENTIN PLGA microspheres Accelerated release in vitro glass transition temperature
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A Study on the Properties of Resin Transfer Molding Cyanate Ester and Its T800 Grade Carbon Fiber Composites 被引量:5
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作者 Qiuren Ou Peijun Ji +1 位作者 Jun Xiao Ling Wu 《Fluid Dynamics & Materials Processing》 EI 2019年第1期27-37,共11页
The properties of resin transfer molding(RTM)cyanate ester and its T800 grade carbon fiber composites were studied with the rheometer,differential scanning calorimetry(DSC),FT-IR,dynamic mechanical analyzer(DMA),therm... The properties of resin transfer molding(RTM)cyanate ester and its T800 grade carbon fiber composites were studied with the rheometer,differential scanning calorimetry(DSC),FT-IR,dynamic mechanical analyzer(DMA),thermal gravimetric analysis(TGA),mechanical property testing,and scanning electron microscopy(SEM).The results showed that the temperature of cyanate ester suitable for RTM process was 70℃.Curing process of the resin was 130℃/2 h+160℃/2 h+200℃/2 h+220℃/4 h.Glass transition temperature and heat decomposition temperature of the cured resin are 289℃and 415℃,respectively.Mechanical properties of T800/RTM cyanate composites are 13.5%higher than that of T700/RTM cyanate composites and equal to that of T800/Prepreg cyanate composites.Tg of T800/RTM cyanate composites was proved to be 291℃.Fracture pattern of the composites was flat,which proved excellent interface properties between fiber and resin in this composite. 展开更多
关键词 RTM cyanate ester VISCOSITY glass transition temperature heat decomposition temperature mechanical properties
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Multi-scale Studies of Glass Transition and Uniaxial Tensile Properties of a Commercially Available Epoxy Adhesive Using Experimental Measurements and Molecular Dynamics Simulation 被引量:2
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作者 姚力 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2015年第3期465-474,共10页
In this study, the glass transition and uniaxial tensile properties of a commercially available epoxy adhesive were investigated using experimental measurements and molecular dynamics (MD) simulation. Differential s... In this study, the glass transition and uniaxial tensile properties of a commercially available epoxy adhesive were investigated using experimental measurements and molecular dynamics (MD) simulation. Differential scanning calorimetry (DSC) was used to study the change of glass transition temperature (Tg) with cross-link density (CLD). Uniaxial tensile test was performed to measure the Young's modulus (E), Poisson's ratio (v) and yielding strength (tyv). In MD simulation, the complicated epoxy system was simplified as the mixture of two kinds of simple molecules, with the key information well preserved and the less important details omitted. The molecular model of the cross-linked epoxy network was constructed and its mechanical properties were calculated using MD simulation. Overall, the MD simulation results agreed with experimental ones, which proved the validity of the molecular model and justified the simplification method of the industry- level epoxy system. 展开更多
关键词 Epoxy adhesive glass transition temperature Uniaxial tension EXPERIMENT Molecular dynamics simulation.
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Weavability of β-Hydroxybutyrate and β-Hydroxyvalerate Copolymers( PHBV ) /PLA Used in Artificial Blood Vessels 被引量:3
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作者 王红军 李毓陵 马颜雪 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期691-695,共5页
The β-hydroxybutyrate and β-hydroxyvalerate copolymers( PHBV) /polylactic acid( PLA) is a new biocompatible material,which is developed through bacterial fermentation in vivo systems.The PHBV / PLA material could be... The β-hydroxybutyrate and β-hydroxyvalerate copolymers( PHBV) /polylactic acid( PLA) is a new biocompatible material,which is developed through bacterial fermentation in vivo systems.The PHBV / PLA material could be used to make continuous filaments.However,features of artificial blood vessels,especially small diameter vascular grafts made of PHVB / PLA materials are not known.This research are to evaluate and improve weavability of the PHBV / PLA material, and to explore feasibility of using it in artificial blood vessels.Preliminary results showed that weavability of PHBV / PLV was not good,but its weavability could be improved by using methods of weak chemical,such as sizing.In this research,scanning electron microscope( SEM) was adopted to evaluate weavability of PHBV / PLV after sizing and observe surfaces of yarns and fabrics.Also,in order to set proper parameters in heat settings,differential scanning calorimetry( DSC) was used to identify glass transition temperature. 展开更多
关键词 β-hydroxybutyrate and β-hydroxyvalerate copolymers(PHBV) /polylactic acid(PLA) artificial blood vessels glass transition temperature BIOCOMPATIBILITY WEAVABILITY
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Synthesis of Bio-Plasticizer from Soybean Oil and Its Application in Poly(Vinyl Chloride) Films 被引量:2
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作者 Xiao Luo Hongying Chu Mengqi Liu 《Journal of Renewable Materials》 SCIE EI 2020年第10期1295-1304,共10页
Herein,epoxidized soybean oil methyl ester(ESOM)plasticizer was synthesized for the preparation of plasticized poly(vinyl chloride)(PVC)films by the alcoholysis and epoxidation.The chemical structure of ESOM was inves... Herein,epoxidized soybean oil methyl ester(ESOM)plasticizer was synthesized for the preparation of plasticized poly(vinyl chloride)(PVC)films by the alcoholysis and epoxidation.The chemical structure of ESOM was investigated by infrared spectrum and 1 H nuclear magnetic resonance.The effect of content of ESOM and petroleum based plasticizer di-2-ethylhexyl phthalate(DEHP)on the performance of plasticized PVC films was studied.The result showed that substituting DEHP with ESOM can improve the thermal stability of plasticized PVC films.When the weight ratio of ESOM and PVC is fixed at 1:2,plasticized PVC film presents higher elongation at break(350.8%vs.345.1%)and lower tensile strength(14.21 MPa vs.15.8 MPa)compared with PVC plasticized with DEHP.ESOM showed less weight loss than DEHP in all solvents.The excellent migration resistance of ESOM is helpful to improve stability of plasticized PVC films.In all,the obtained bio-based plasticizer will be potential to replace petroleum based plasticizer DEHP in flexible PVC materials. 展开更多
关键词 Soybean oil epoxy plasticizer poly(vinyl chloride) glass transition temperature
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