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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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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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Effect of sintering temperature on the microstructure and properties of foamed glass-ceramics prepared from high-titanium blast furnace slag and waste glass 被引量:5
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作者 Chang-hong Chen Ke-qin Feng +1 位作者 Yu Zhou Hong-ling Zhou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第8期931-936,共6页
Foamed glass-ceramics were prepared via a single-step sintering method using high-titanium blast furnace slag and waste glass as the main raw materials The influence of sintering temperature(900–1060℃) on the micros... Foamed glass-ceramics were prepared via a single-step sintering method using high-titanium blast furnace slag and waste glass as the main raw materials The influence of sintering temperature(900–1060℃) on the microstructure and properties of foamed glass-ceramics was studied. The results show that the crystal shape changed from grainy to rod-shaped and finally turned to multiple shapes as the sintering temperature was increased from 900 to 1060℃. With increasing sintering temperature, the average pore size of the foamed glass-ceramics increased and subsequently decreased. By contrast, the compressive strength and the bulk density decreased and subsequently increased. An excessively high temperature, however, induced the coalescence of pores and decreased the compressive strength. The optimal properties, including the highest compressive strength(16.64 MPa) among the investigated samples and a relatively low bulk density(0.83 g/cm^3), were attained in the case of the foamed glass-ceramics sintered at 1000℃. 展开更多
关键词 foamed glass-CERAMICS sintering temperature BLAST FURNACE SLAG waste glass CRYSTALLIZATION
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Optical temperature sensor based on up-conversion fluorescence emission in Yb^(3+):Er^(3+) co-doped ceramics glass 被引量:5
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作者 徐伟 李成仁 +1 位作者 曹保胜 董斌 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第12期526-529,共4页
yb^3+:Er^3+ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3+ was discussed, and the temperature properties of green up-conversion fluorescence between 30... yb^3+:Er^3+ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3+ was discussed, and the temperature properties of green up-conversion fluorescence between 303 and 823 K were investigated. The results show that the sensitivity of this sample reaches its maximum value, about 0.0047 K^-1, when the temperature is 383 K, indicating that this kind of sample can be used as high temperature and high sensitivity optical temperature sensor. 展开更多
关键词 yb^3+:Er^3+ co-doped ceramics glass up-conversion emission optical temperature sensor
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Deformation and fracture of a Zr-Al-Cu metallic glass ribbon under tension near glass transition temperature 被引量:3
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作者 Xue-feng Gao Na Ge +2 位作者 Fu-yu Dong Rui-chun Wang Hong-wang Yang 《China Foundry》 SCIE 2018年第3期216-221,共6页
The high temperature tensile and fracture behavior of Zr50Al40Cu10 metallic glass at the temperature range in the vicinity of glass transition were investigated. Tensile tests were carried out at room temperature, 350... The high temperature tensile and fracture behavior of Zr50Al40Cu10 metallic glass at the temperature range in the vicinity of glass transition were investigated. Tensile tests were carried out at room temperature, 350-420 ℃, and in the supercooled liquid region temperature range, respectively. Obvious plastic deformation was initiated at temperature about 80 °C lower than the glass transition temperature. The ultimate tensile strength decreases with the increase of testing temperature and the ductility increases with temperature. At temperature higher than Tg, viscous flow of Non-Newtonian fluid led to super plastic deformation behavior. The deformation process under tension was inhomogeneous, and remarkable serrations were observed on the stress-strain curve near glass transition temperature. 展开更多
关键词 metallic glasses high temperature mechanical properties fracture behavior plastic deformation
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Effects of Flame Temperature and SiCl_4 Concentration on Particle Characteristics for Synthetic Silica Glass 被引量:1
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作者 王蕾 顾真安 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第3期419-422,共4页
Effects of flame temperature and SiCl4 concentration on the particle characteristics were studied.The flame temperature distributions were measured using modified sodium line-reversal technology.The particles were col... Effects of flame temperature and SiCl4 concentration on the particle characteristics were studied.The flame temperature distributions were measured using modified sodium line-reversal technology.The particles were collected by quartz supports and were analyzed by scanning electron microscope(SEM) at different locations along the flame centerline.When the SiCl4 concentration is 16 g/min,the particles first grow and then shrink with the flame temperature increasing.When the SiCl4 concentration is 26 g/min,the flame temperature has little influence on the particle characteristics along the flame and many large spherical particles exist all the way. 展开更多
关键词 synthetic silica glass flame temperature particle size and morphology
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Effect of sintering temperature on luminescence properties of borosilicate matrix blue–green emitting color conversion glass ceramics 被引量:1
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作者 Qiao-Yu Zheng Yang Li +3 位作者 Wen-Juan Wu Ming-Ming Shi Bo-Bo Yang Jun Zou 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第10期550-555,共6页
The color conversion glass ceramics which were made of borosilicate matrix co-doped(SrBaSm)Si2O2N2:(Eu^3+Ce^3+) blue-green phosphors were prepared by two-step method in co-sintering. The change in luminescence propert... The color conversion glass ceramics which were made of borosilicate matrix co-doped(SrBaSm)Si2O2N2:(Eu^3+Ce^3+) blue-green phosphors were prepared by two-step method in co-sintering. The change in luminescence properties and the drift of chromaticity coordinates(CIE) of the(SrBaSm)Si2O2N2:(Eu^3+Ce^3+) blue-green phosphors and the color conversion glass ceramics were studied in the sintering temperature range from 600℃ to 800℃. The luminous intensity and internal quantum yield(QY) of the blue-green phosphors and glass ceramics decreased with the sintering temperature increasing. When the sintering temperature increased beyond 750℃, the phosphors and the color conversion glass ceramics almost had no peak in photoluminescence(PL) and excitation(PLE) spectra. The results showed that the blue-green phosphors had poor thermal stability at higher temperature. The lattice structure of the phosphors was destroyed by the glass matrix and the Ce^3+ in the phosphors was oxidized to Ce^4+, which further caused a decrease in luminescent properties of the color conversion glass ceramics. 展开更多
关键词 (SrBaSm)Si2O2N2:(Eu^3+Ce^3+) PHOSPHORS blue-green color conversion glass ceramic luminescent intensity thermal quenching effects sintering 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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Effect of temperature on formability of glass mat reinforced thermoplastic sheets with ductile dummy sheets 被引量:1
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作者 WANG Jian FU Chang-yun +1 位作者 YU Yue ZHU Wei 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第4期779-786,共8页
Given the increasing use of glass mat-reinforced thermoplastic(GMT)composites,the formability of GMT sheets is currently a topic of research.A new sheet forming process for solidified GMT was developed.In this process... Given the increasing use of glass mat-reinforced thermoplastic(GMT)composites,the formability of GMT sheets is currently a topic of research.A new sheet forming process for solidified GMT was developed.In this process,a GMT sheet was sandwiched by dummy metallic sheets during deep drawing.The dummy metallic sheets acted as protective materials and media for heating the GMT sheet.In this study,tensile tests of GMT specimens were carried out under different temperature conditions.The effect of temperature on the tensile deformation was analyzed.The effect of temperature on the deep drawing process of GMT sheets with dummy sheets was further investigated.Finite element method(FEM)was conducted to simulate the deep drawing process.In the drawing force rising stage,the law of drawing force with the depth of the drawing was analyzed using FEM and experiments. 展开更多
关键词 sheet forming glass mat-reinforced thermoplastic finite element method temperature dummy sheets
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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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THE EFFECT OF MELTING TEMPERATURE ON THE PROPERTIES OF PbBr _2-PbCl_2-P_2O_5 GLASSES
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作者 H.S.Zhao,W.C.Zhou, D.L.Zhao and D.M.Zhu State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1153-1158,共6页
A series of PbBr 2 PbCl 2 P 2O 5 glasses have been prepared and characterized to research the effect of melting temperature on the properties of glasses. The glass forming regions have been explored and the stability ... A series of PbBr 2 PbCl 2 P 2O 5 glasses have been prepared and characterized to research the effect of melting temperature on the properties of glasses. The glass forming regions have been explored and the stability of the glasses against crystallization studied. The density, characteristic temperatures, chemical analysis compositions, and infrared absorption spectra of the glasses were measured. Results show that the PbBr 2 PbCl 2 P 2O 5 ternary system melted at 530~540℃ has a broader glass forming region which extended to the side of PbBr2 than that melted at 450~470℃. The glass transition temperature is more than 200℃ and the density is more than 5 5 g·cm 3 . Both the chemical analysis composition and the infrared absorption spectra of some glasses melted at 530~540℃ show that the decomposition of NH 4H 2PO 4 is more complete than that of glasses melted at 450~470℃. 展开更多
关键词 PHOSPHATE glassES MELTING temperature PROPERTY
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Temperature Modeling of the Molten Glass in Tin Bath
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作者 魏志华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第2期333-335,共3页
Based on the experimental investigation by quantitative analysis, temperature fields of the molten glass in tin bath were numerically simulated by the finite elememt method. The experimental results show that the cool... Based on the experimental investigation by quantitative analysis, temperature fields of the molten glass in tin bath were numerically simulated by the finite elememt method. The experimental results show that the cooling rate of glass is directly proportional to the draught speed, but inversely proportional to the thickness of the glass. This model lays the foundation for computer simulation system about float glass. 展开更多
关键词 float glass tin bath temperature field finite element
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Low-frequency Internal Friction Behaviour of Zr55Al10Ni5Cu30 Metallic Glass with Different Quenching Temperatures
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作者 王知鸷 WANG Dong +4 位作者 JIANG Peng WU Wangping LI Xiaoyan ZU Fangqiu SHUI Jiapeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第6期1476-1480,共5页
The correlation between the internal friction behaviour of Zr55 Al10 Ni5 Cu30 BMG samples and their quenching temperatures was investigated. It was found that, below the glass transition temperature, the activation en... The correlation between the internal friction behaviour of Zr55 Al10 Ni5 Cu30 BMG samples and their quenching temperatures was investigated. It was found that, below the glass transition temperature, the activation energy decreased with increasing quenching temperature, but in the surpercooled liquid region the activation energy tended to be enhanced with a further increase in the quenching temperature. Besides, there were both anelastic and viscoelastic relaxation for the amorphous alloys. The anelastic behaviour would change into viscoelastic relaxation easily for the samples prepared at higher temperature. 展开更多
关键词 internal friction quenching temperature metallic glass
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AN EXPERIMENTAL STUDY OF DYNAMIC TENSILE PROPERTIES OF GLASS FIBER AT LOW-TEMPERATURES
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作者 Huang Wen Xia Yuanming 《Acta Mechanica Solida Sinica》 SCIE EI 2002年第3期201-207,共7页
Tensile impact experiments of EC8.0-24×7 glass fiber bundles atdifferent low tempera- tures T(14 deg. C, -40 deg. C and -100 deg. C)and strain rates ε were carried out, and complete stres-straincurves were obtai... Tensile impact experiments of EC8.0-24×7 glass fiber bundles atdifferent low tempera- tures T(14 deg. C, -40 deg. C and -100 deg. C)and strain rates ε were carried out, and complete stres-straincurves were obtained. Within the range of the experiment temperaturesand strain rates, it is found that the initial modulus E, theultimate strength σ_max and the unstable strain ε_b of the glassfiber bundles all increase with ε at an identical T. At an identicalε, with the decrease of T, E and σ_max increase; but ε_b increaseswhen 14 deg. C >T>-40 deg. C and decreases when -40 deg. C>T>-100deg. C. 展开更多
关键词 glass fiber low temperature tensile impact Weibull distribution
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Predicting Equation for Adjusting Glass Temperature of Binder Used for P/M Warm Compaction Processing
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作者 Shiju Guo Tao Lin Mingyi Li (Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1998年第1期39-40,共2页
Based on considering both negative effect of compacting pressure on glass temperature (Tg) and positiveeffect of plasticizer added into organic binder, a mathematical equation for adjusting Tg of binder used for warmc... Based on considering both negative effect of compacting pressure on glass temperature (Tg) and positiveeffect of plasticizer added into organic binder, a mathematical equation for adjusting Tg of binder used for warmcompaction processing is given. The equation shows that mass fraction of plasticizer need for lowering Tg is function of compacting plessure. The rationality of the equation for warm compaction processing is also discussed. 展开更多
关键词 warm compaction BINDER glass temperature
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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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CONSTITUTIVE MODEL AND DYNAMIC MECHANICAL PROPERTIES OF GLASS-CLOTH/EPOXY LAMINATES AT DIFFERENT TEMPERATURES
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作者 韩小平 韩省亮 +2 位作者 李华 殷民 郑长卿 《Chinese Journal of Aeronautics》 SCIE EI CSCD 1998年第2期9-12,共4页
CONSTITUTIVEMODELANDDYNAMICMECHANICALPROPERTIESOFGLASS┐CLOTH/EPOXYLAMINATESATDIFFERENTTEMPERATURESHANXiaopin... CONSTITUTIVEMODELANDDYNAMICMECHANICALPROPERTIESOFGLASS┐CLOTH/EPOXYLAMINATESATDIFFERENTTEMPERATURESHANXiaoping(韩小平)1,HANShenli... 展开更多
关键词 glass cloth/epoxy laminates strain rate temperature effects constitutive equations
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Effects of Substrate Temperatures on the Structure and UV-shielding Properties of TiO_2-CeO_2 Films Deposited on Glass by Radio-frequency Magnetron Sputtering
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作者 赵青南 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第4期7-9,共3页
TiO2-CeO2 films were deposited on soda-lime glass substrates at varied substrate temperatures by rf magnetron sputtering using 40% molar TiO2-60% molar CeO2 ceramic target in Ar:O2=95:5 atmosphere.The structure,surf... TiO2-CeO2 films were deposited on soda-lime glass substrates at varied substrate temperatures by rf magnetron sputtering using 40% molar TiO2-60% molar CeO2 ceramic target in Ar:O2=95:5 atmosphere.The structure,surface composition,UV-visible spectra of the films were measured by scanning electron microscopy and X-ray diffraction,and X-ray photoelectron spectroscopy,respectively.The experimental results show that the films are amorphous,there are only Ti^4+ and Ce^4+ on the surface of the films,the obtained TiO2-CeO2 films shou a good uniformity and high densification,and the films deposited on the glass can shield ultraviolet light without significant absorpition of visible light,the films deposited on substrates at room temperature and 220℃ absorb UV effectively. 展开更多
关键词 rf sputtering TiO2-CeO2 films ultraviolet-shielding coating glass substrate temperatures
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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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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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