期刊文献+
共找到53篇文章
< 1 2 3 >
每页显示 20 50 100
Influence ofβ-nucleating Compound Agents on the Mechanical Properties and Crystallization Behavior of Polypropylene Random Copolymer 被引量:2
1
作者 谷亚新 LIU Yunxue +3 位作者 FAN Zhaorong GUI Jianfeng 刘鹏 WANG Hongmei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第1期237-243,共7页
A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifie... A novel polypropylene random(PPR)composite materials with optimized properties was developed by addingβ-nucleating compound agents(rare earth complex WBG-2 and aryl amide derivative TMB-5)and ternary compound modifier(TPE/WBG-2/CaCO_(3)).The effects of differentβ-nucleating agents and ternary compound modifier on the mechanical properties and crystallization behavior of PPR were analyzed.The results show that,compared with pure PPR materials,both WBG-2 and TMB-5 could significantly improve the impact strength of PPR.The crystallization temperature of PPR increased with the addition ofβ-nucleating agent.The modified PPR prepared with ternary compound modifier showed the most excellent comprehensive properties. 展开更多
关键词 polypropylene random copolymer β-nucleating agent impact strength crystallization behavior
下载PDF
Confined Crystallization Behaviors of Cross-linked Comb-like Copolymers
2
作者 Xian-jing Gong 施德安 +4 位作者 Ying-kui Yang Tao Jiang Yan-feng Meng Robert K.Y.Li 蒋世春 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2016年第8期1039-1046,共8页
Cross-linked PEG-based copolymers were obtained via synthesis of polyethylene glycol (PEG) and methoxy polyethylene glycol (MPEG) by the bridging and/or cross-linking agent of 2,4-tolylene diisocyanate (TDI) and... Cross-linked PEG-based copolymers were obtained via synthesis of polyethylene glycol (PEG) and methoxy polyethylene glycol (MPEG) by the bridging and/or cross-linking agent of 2,4-tolylene diisocyanate (TDI) and/or hexamethylene-l,6-diisocyanate homopolymer (HDI trimer). The effects on the crystallization behaviors of the samples could be found with the changes in molecular weight of MC-PEG and molecular weight of SC-PEG in certain cross-linked density. It is revealed that the samples appear not to crystallize when the molecular weight of MC-PEG and SC-PEG are 1000 g/mol or less than that. The samples begin to crystallize when the molecular weight of either MC-PEG or SC-PEG reaches 2000 g/mol. The crystallinity of crystallized MC-PEG decreases with the increasing molecular weight of uncrystallized SC-PEG and the crystallinity of crystallized SC-PEG declines with the rise of molecular weight of uncrystallizable MC-PEG. The chains of SC-PEG (M_n = 2000 g/mol) can fold and align easilier than those of MC-PEG (M_n = 2000 g/mol), when the content of PEG is the same. 展开更多
关键词 PEG-based copolymers Cross-linking Comb-like Confined crystallization behavior.
原文传递
Effect of yttrium on thermal stability and crystallization behavior of Nd_(60)Fe_(20)Al_(10)Ni_(10) amorphous alloys 被引量:3
3
作者 张莎莎 田学雷 孔凡利 《Journal of Rare Earths》 SCIE EI CAS CSCD 2008年第5期735-740,共6页
The effect of yttrium on the thermal stability and crystallization behavior of Nd-Fe-Al-Ni amorphous alloys was investigated using X-ray diffraction (XRD), differential scanning calorimeter (DSC), and transmission... The effect of yttrium on the thermal stability and crystallization behavior of Nd-Fe-Al-Ni amorphous alloys was investigated using X-ray diffraction (XRD), differential scanning calorimeter (DSC), and transmission electron microscopy (TEM).The results indicated that the as-cast Nd60Fe20Al10Ni10-xYx(X=-0, 2) amorphous alloys were fabricated with some quenched-in crystals, which could be restrained by Y. With the effect of yttrium, both the crystallization temperature and exothermic peak shifted to higher temperatures, illustrating that the thermal stability could be improved. The addition of Y changed the crystallization process and final crystallization results. Moreover, the crystallites in the amorphous matrix became more homogeneous and smaller. Meanwhile, Y was useful for the passivation of oxygen in chemistry and restrained the negative effect of oxygen. The activation energies of the start of crystallization and peaking were 1.21 and 1.16 eV, respectively, according to the Kissinger equation. 展开更多
关键词 Nd-based amorphous alloy quenched-in crystals thermal stability crystallization behavior activation energy rare earths
下载PDF
Study on crystallization and microstructure of Li_2O-Al_2O_3-SiO_2 glass ceramics 被引量:2
4
作者 Zhaoxia Hou Yongming Zhang +3 位作者 Huashan Zhang Hongbo Zhang Jing Shao Chunhui Su 《Journal of University of Science and Technology Beijing》 CSCD 2006年第6期564-569,共6页
Lithium aluminosilicate (LAS) glasses are generally difficult to prepare because of their high melting temperature. In this study, the preparation of LAS glasses was achieved at a relatively low melting temperature.... Lithium aluminosilicate (LAS) glasses are generally difficult to prepare because of their high melting temperature. In this study, the preparation of LAS glasses was achieved at a relatively low melting temperature. The batch containing MgO-ZnO-LiEO- Al2O3-SiO2 was melted in a platinum crucible at 1550℃ for 2 h and was then followed by two- or three-step heat treatment processes for nucleation and crystal growth. The characterizations were carried out by differential thermal analysis, X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and UV-Vis-NIR scanning spectrophotometry. The hexagonal stuffed β-eucryptite solid solution crystallized at 840-960℃. Most of the hexagonal β-eucryptite solid solution transformed into the tetragonal β-spodumene solid solution at 1100℃. Almost all the aluminum atoms entered into the tetrahedral sites in the aluminosilicate network of the 6- eucryptite/β-quartz solid solution. All of the Al atoms did not belong to the aluminosilicate network of the β-spodumene solid solution. The glass ceramic with a mean grain size of 10-20 nm is transparent, the transmittance reaches -85% in the visible light wavelength. 展开更多
关键词 inorganic compounds glass ceramics crystallization behavior microstructure characterization
下载PDF
FRACTAL BEHAVIOR OF DEVELOPMENT OF PHASE SEPARATION AND CRYSTALLIZATION IN BLENDS OF NYLON-6 WITH SODIUM SALT OF ETHYLENE /METHACRYLIC ACID COPOLYMER
5
作者 韩蕴萍 盛京 李著萍 《Transactions of Tianjin University》 EI CAS 1999年第2期93-97,共5页
Phase separation was studied by the optical microscopy in blends of nylon 6 (PA6) with sodium salt of ethylene/methacrylic acid copolymer (PEMA).The image collecting technology was used to keep track of the developme... Phase separation was studied by the optical microscopy in blends of nylon 6 (PA6) with sodium salt of ethylene/methacrylic acid copolymer (PEMA).The image collecting technology was used to keep track of the development of blends at a certain temperature.The fractal dimension of phase separation was calculated by the image solving technology according to the fractal theory and the self similarity behavior of the process was proved.The relationship of the fractal behavior with composition and experimental temperature was discussed.The fractal behavior of the crystallization development of the crystal phase of PA6 in blends was also discussed and the fractal behavior calculated. 展开更多
关键词 phase separation of nylon 6 blends fractal behavior of phase separation fractal behavior of development of crystallization
下载PDF
Influence of Carbon Nanofiber Addition on Mechanical Properties and Crystallization Behavior of Polypropylene 被引量:1
6
作者 Xin TONG Yong CHEN Huiming CHENG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第5期686-690,共5页
Carbon nanofiber (CNF)-reinforced polypropylene (CNF/PP) composites with different CNF contents were prepared by melt mixing, and the mechanical properties and crystallization behavior of the CNF/PP composites obt... Carbon nanofiber (CNF)-reinforced polypropylene (CNF/PP) composites with different CNF contents were prepared by melt mixing, and the mechanical properties and crystallization behavior of the CNF/PP composites obtained were investigated. It was found that the tensile modulus of the composites was increased with the addition of CNFs, but their elongation at break and fracture strain energy were decreased, while the tensile strength of the composites was firstly increased and then decreased due to the agglomeration of CNFs at higher loading. Nonisothermal crystallization analysis showed that the CNFs played a role as nucleating agent in PP matrix, which led to increment in the crystallization rate and the degree of crystallinity of PP. Moreover, X-ray diffraction studies showed that the CNFs incorporated in the PP matrix favored the growth of (040)-oriented PP crystals. With the increase in the CNF content, the nucleating and orientation roles of the CNFs were obviously enhanced. 展开更多
关键词 Carbon nanofibers COMPOSITES Mechanical properties crystallization behavior
下载PDF
Effect of Rare Earth on the Crystallization Behavior of Li_2O-Al_2O_3-SiO_2 Glass-ceramic 被引量:1
7
作者 吴松全 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第S1期123-127,共5页
X-ray powder diffraction and Fourier transform infrared spectroscopy were applied for characterization of Li2O-Al2O3-SiO2 glass-ceramic powders doped with Eu2O3,Gd2O3 and Er2O3,respectively,in the conditions of differ... X-ray powder diffraction and Fourier transform infrared spectroscopy were applied for characterization of Li2O-Al2O3-SiO2 glass-ceramic powders doped with Eu2O3,Gd2O3 and Er2O3,respectively,in the conditions of different heat-treatment temperatures and with various amounts.The powders were derived from the polyacrylamide gel method.The results show that,the wet gels prepared by polyacrylamide perform a unique crystallization behavior in the process of drying,comparing with some customary preparation such as melt processing.The main crystal phase and crystallization sequence of Li2O-Al2O3-SiO2 micro-powders have no distinct with addition of Eu2O3,Gd2O3 or Er2O3,while the crystallization temperature of the β-spodumene decreased and the amount of the β-spodumene increased. 展开更多
关键词 Li2O-Al2O3-SiO2 glass-ceramic powders polyacrylamide gel rare-earth oxides crystallization behavior
下载PDF
Study on Morphology and Non-isothermal Crystallization Behavior of Poly(phenylene sulfide)/Poly(ethylene-co-cyclo-hexane 1,4-dimethanol terephthalate) Blend 被引量:1
8
作者 Shi Jun Chen Yanming Chen Ying 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2010年第1期61-66,共6页
A binary alloy consisting of poly(phenylene-sulfide) (PPS)/poly(ethylene terephthalate-co-l,4- cyclohexanedimethanol) (PETG) was prepared by the melt blending technology using a twin-screw extruder. The morpho... A binary alloy consisting of poly(phenylene-sulfide) (PPS)/poly(ethylene terephthalate-co-l,4- cyclohexanedimethanol) (PETG) was prepared by the melt blending technology using a twin-screw extruder. The morphology and crystallization behavior of the alloy material were investigated by means of SEM, POM and DSC. The SEM study of the alloy samples revealed that PPS and PETG comprised an incompatible system and the interface structure of two phases could be observed distinctly when the composition of the binary alloy was being changed. The POM results had revealed that incorporation of PETG into PPS could lead to formation of larger spherulite crystals in the course of PPS crystallization, but small and grainy spherulite crystals appeared with further increase in the PETG concentration. The DSC analyses revealed that addition of PETG to the alloy composition could shift the PPS crystallization temperature towards the high-temperature region. 展开更多
关键词 PETG PPS alloy MORPHOLOGY crystallization behavior
下载PDF
Crystallization behavior of Fe_(78)Si_(13)B_9 metallic glass under high magnetic field 被引量:1
9
作者 Yuanfei Yu Baozhu Liu Min Qi 《Journal of University of Science and Technology Beijing》 CSCD 2008年第5期600-604,共5页
The effects of high magnetic field on the crystallization behavior of the Fe78Si13B9 metallic glass ribbon were studied. The samples were isothermal annealed for 30 min under high magnetic field and no field,respectiv... The effects of high magnetic field on the crystallization behavior of the Fe78Si13B9 metallic glass ribbon were studied. The samples were isothermal annealed for 30 min under high magnetic field and no field,respectively. Microstructure transformation during crystallization was identified by X-ray diffraction and transmission electron microscopy. It was found that the crystallizations of Fe78Si13B9 metallic glass processed under different conditions were that the precipitation of dendrite α-Fe(Si) and spherulite (Fe,Si)3B phases forms amorphous matrix and then the metastable (Fe,Si)3B phase transforms into the stable Fe2B phase. The grain size of the crystals is smaller and more homogeneous for the isothermal annealed samples under high magnetic field in comparison with that under no field indicating that the crystallization behavior of Fe78Si13B9 metallic glass is suppressed by high magnetic field. 展开更多
关键词 metallic glass high magnetic field isothermal annealing crystallization behavior
下载PDF
Preparation,Structures,Thermal Properties and Sintering Behaviors of B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 Glass 被引量:3
10
作者 丁阚俊杰 chen nan +1 位作者 杜国平 zhang aisheng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第6期1323-1328,共6页
B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with different Al_2O_3 contents(1mol%, 3mol%, 5mol%, and 7mol%) was prepared, and it was intended to be used as lead-free and low-melting glass sealants for solid oxide fuel cells.... B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with different Al_2O_3 contents(1mol%, 3mol%, 5mol%, and 7mol%) was prepared, and it was intended to be used as lead-free and low-melting glass sealants for solid oxide fuel cells. The effects of Al_2O_3 content on the structures, thermal properties, and sintering behaviors of the B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass were investigated in detail. The Al_2O_3 content largely influenced the structures and thermal properties of the glass. When the Al_2O_3 content 5mol%, the transition temperature of the glass decreased with the Al_2O_3 content, while the crystallization temperature increased with the Al_2O_3 content. However, higher Al_2O_3 content degraded the stability of the glass. The B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with 5 mol% Al_2O_3 content exhibits the optimal sintering densification characteristics and can be used as glass sealants for solid oxide fuel cells. 展开更多
关键词 B2O3-SiO2-ZnO-BaO-Al2O3 glass thermal properties sintering behavior densification crystallization
下载PDF
Crystallization Behavior and Thermal Properties of PP/MgAl LDH Nanocomposites Prepared in Non-polar Solution
11
作者 CUI Zhe ZHANG Guo-ying QU Bao-jun 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第1期152-156,共5页
Polypropylene(PP)/MgAl layered double hydroxide(MgAl LDH) nanocomposites were synthesized by refluxing PP and dodecyl sulfate-intercalated MgAI LDH[MgAI(DS)] in non-polar xylene. Their structure, thermal and cry... Polypropylene(PP)/MgAl layered double hydroxide(MgAl LDH) nanocomposites were synthesized by refluxing PP and dodecyl sulfate-intercalated MgAI LDH[MgAI(DS)] in non-polar xylene. Their structure, thermal and crystallization properties were studied via X-ray diffraction(XRD), transmission electron microscopy(TEM), thermogravimetric analysis(TGA), differential scanning calorimetry(DSC), and polarized light microscopy(PLM). The nanoscaled dispersion of MgAI(DS) nanolayeres in the PP matrix was verified by the disappearance of the d(003) XRD diffraction peak of MgAI(DS) and observation of TEM image. The DSC data show that the SDS/LDH inorganic components negatively affect the crystallization properties of PP and decrease the size of PP sphcrulites because the inorganic components act as additional nuclei. The PP/MgA1 LDH nanocomposites have a faster charring progress in a temperature range of 250--430 ℃ and a better thermal stability above 320℃ than pure PP. 展开更多
关键词 Layered doubled hydroxide POLYPROPYLENE NANOCOMPOSITE Thermal property crystallization behavior
下载PDF
MISCIBILITY AND CRYSTALLIZATION BEHAVIOR OF BIODEGRADABLE BLEND OF POLY(β—HYDROXYBUTYRATE)AND POLY(D,L—LACTIDE)—CO—POLY(ETHYLENE GLYCOL)
12
作者 Xian Mo DENG Lian Lai ZHANG Cheng Dong XIONG Chengdu Institute of Organic Chemistry,Academia Sinica,Chewgdu 610041 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第3期265-268,共4页
Studies on the miscibility of PHB/PELA blends showed that PHB and PELA were miscible in amorphous state.The crystallization behavior of PHB in the blend was strongly de- pendent on the addition of PELA component.
关键词 PELA HYDROXYBUTYRATE)AND POLY LACTIDE MISCIBILITY AND crystallization BEHAVIOR OF BIODEGRADABLE BLEND OF POLY PHB D L CO
下载PDF
STUDIES ON THE MECHANICAL PROPERTIES AND CRYSTALLIZATION BEHAVIOR OF POLYETHYLENE COMPOSITES
13
作者 朱进 欧玉春 冯宇鹏 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1995年第3期218-227,共10页
The effects of interfacial modifier on the mechanical, dynamic mechanical properties and crystallization behavior of the polyethylene composites were investigated in the present paper. It was found that the interfacia... The effects of interfacial modifier on the mechanical, dynamic mechanical properties and crystallization behavior of the polyethylene composites were investigated in the present paper. It was found that the interfacial modifer significantly improved the mechanical properties, influenced the dynamic mechanical spectra and slightly changed the crystallization behavior. The results showed that the interfacial modifier changed the dispersion state of dispersed phase of the composites, resulting in different phase structure, which was the major reason leading to different mechanical and crystallization properties. 展开更多
关键词 HDPE INTERFACIAL MODIFIER MECHANICAL PROPERTY crystallization BEHAVIOR
下载PDF
The Crystallization Behavior and Stability of Chromite Synthesized in Chromium-Containing Wastewater at Room Temperature
14
作者 Jin-Fang Lv Ying-Cong Quan +2 位作者 Xiong Tong Yongjun Peng Yong-Xing Zheng 《Engineering》 SCIE EI 2022年第2期67-76,共10页
The ferrite process can not only purify wastewater containing heavy metal ions but also recycle valuable metals from wastewater. Therefore, it is considered a promising technology to treat chromiumcontaining wastewate... The ferrite process can not only purify wastewater containing heavy metal ions but also recycle valuable metals from wastewater. Therefore, it is considered a promising technology to treat chromiumcontaining wastewater. However, the process has not been extensively applied in industry due to its high synthesis temperature. In this paper, the feasibility of chromite synthesis at room temperature was comprehensively studied. The effects of critical factors on the effluent quality and the crystallization behavior and stability of the synthetic products were investigated. Results showed that the removal ratio of chromium from wastewater was over 99.0%, and the chromium concentration in the supernatant reached the sewage discharge standard after undergoing the ferrite process at room temperature. Increases in the aeration rate, stirring rate, and reaction time were favorable for the formation of stable chromite. The particles obtained by the ferrite process at room temperature were characterized by a compact structure, and the maximum size of the particles reached 52 μm. Chromium gradually entered the spinel crystal structure during the synthesis process, and the molecular formula of the synthetic chromite might be Fe3-xCrxO4, in which x was approximately 0.30. The path of the microscopic reaction was proposed to illuminate the synthesis mechanism of chromite under room temperature conditions. The present study has laid the foundation for the industrial application of the ferrite process in the purification and utilization of chromium-containing wastewater. 展开更多
关键词 Chromium-containing wastewater Synthesis of chromite Room temperature crystallization behavior STABILITY
下载PDF
Crystallization Behavior of Polymer Derived Silicon Carbide Sintered Through Microwave Heating Technique
15
作者 熊俊 HUANG Qing 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第6期1368-1373,共6页
A self-crosslinkable liquid highly branched polycarbosilane(LHBPCS) with 5.07% vinyl group and a C/Si ratio of 1.33 was used as the precursor to prepare Si C ceramic material. Microwave heating technique and convent... A self-crosslinkable liquid highly branched polycarbosilane(LHBPCS) with 5.07% vinyl group and a C/Si ratio of 1.33 was used as the precursor to prepare Si C ceramic material. Microwave heating technique and conventional heating method were applied for the heating treatment process. It was found that, compared with conventional heating method, microwave heating technique could enhance the crystallinity of Si C ceramic material with small grain size at much lower curing temperature and within shorter time. In addition, the SiO_2 additive could lead to less α-Si C and excess carbon, but worsen the crystallinity of β-Si C in the final samples. 展开更多
关键词 liquid highly branched polycarbosi'ane microwave heating crystallization behavior Β-SIC
下载PDF
Crystallization and microstructure evolution of amorphous Al_(85)Y_4Nd_4Ni_7 alloy
16
作者 WUWei SUYong CHENYiqing CHENYuanxi HULei 《Rare Metals》 SCIE EI CAS CSCD 2004年第4期326-329,共4页
The mixture model of Al_(85)Y_4Nd_4Ni_7 alloy in which a partiallycrystallized amorphous alloy is regarded as a nanocornposite of an Al nanoparticle and a remainingamorphous matrix is presented. Its evolution in the p... The mixture model of Al_(85)Y_4Nd_4Ni_7 alloy in which a partiallycrystallized amorphous alloy is regarded as a nanocornposite of an Al nanoparticle and a remainingamorphous matrix is presented. Its evolution in the process of crystallization has been investigatedby differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electronmicroscopy (TEM). Mainly amorphous structure with alpha-Al nanocrystals embedded in the amorphousmatrix has been revealed by melt spining the alloy. Crystallization is showed to occur in threestages: (1) crystallization of amorphous alloy and formation of AINiY, AINdNi and unknowncrystalline phases, (2) formation of Al_3 Y and Al_3Nd, and (3) formation of Al_3Ni. 展开更多
关键词 amorphous alloys Al_(85)Y_4Nd_4Ni_7 alloy rapid solidification crystallization behavior
下载PDF
Effect of the CaF_2-fraction in the glass-ceramic with abrasion resistance on crystallization
17
作者 胡斌梁 赵运才 《Journal of Coal Science & Engineering(China)》 2005年第1期93-97,共5页
Investigated the effect of an addition of CaF2 on the crystallization of a glass-ceramic with abrasion resistance. X-ray diffraction, differential thermal analysis and scanning electron microscopy were used to determi... Investigated the effect of an addition of CaF2 on the crystallization of a glass-ceramic with abrasion resistance. X-ray diffraction, differential thermal analysis and scanning electron microscopy were used to determine the effect. The results showed that a suitable addition of CaF2 promoted crystallization by forming an interme- diate crystalline phase. CaF2 can decrease the temperature and active energy of the base-glass for crystallization. When 4 mass-% of CaF2-fraction is added in the glass, the crystallization temperature and active energy is 936 ℃and 172.75 kJ/mol respectively. When CaF2 is increased to 6 mass-%, the temperature and active energy decrease to 890 ℃ and 88.81 kJ/mol. CaF2 is an efficient nucleating agent for the glass-ceramics with abrasion resistant, the optimal content of CaF2 is about 6 mass-%. 展开更多
关键词 GLASS-CERAMIC abrasion resistance crystallization behavior nucleating agent
下载PDF
Crystallization Behevior of Poly(3-dodecylthiophene)
18
作者 Xiu Ying QIAO Xian Hong WANG +1 位作者 Zhi Shen MO Hong Fang ZHANG(Polymer Physics Laboratory. Changchun Institute of Applied Chemistry. Chinese Academy of Sciences. Changchun 130022) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第5期419-420,共2页
The crystallization behavior of poly (3-dodecylthiophene) (P3DDT) is studied bq differential scanning calorimetry (DSC) under different cooling rates. When the methods of Jeziorny., Ozawa and a new one proposed by our... The crystallization behavior of poly (3-dodecylthiophene) (P3DDT) is studied bq differential scanning calorimetry (DSC) under different cooling rates. When the methods of Jeziorny., Ozawa and a new one proposed by our laboratory are applied to describe its nonisothermal crystallization behavior, the new one is confirmed to be the best and convenient. By determining kinetic parameters, the analysis of the nonisothermal crystallization behavior is performed. According to Kissinger method, the crystallization activation energy of P3DDT is also evaluated. 展开更多
关键词 nonisothermal crystallization behavior poly (3-dodecylthiophene)
下载PDF
The Crystallization Behavior of L-Poly(lactic acid)/Polypropylene Blends:The Acceleration for Both L-Poly(lactic acid)and Polypropylene
19
作者 Shuang-Cheng Li Wei-Jia Zhou +4 位作者 Wen-Jie Wu Jun Shao Shui-Liang Chen Hao-Qing Hou Sheng Xiang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第6期775-786,共12页
For a polymer/polymer dismissible blend with two crystallizable components,the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important,bu... For a polymer/polymer dismissible blend with two crystallizable components,the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important,but did not investigate in detail.In this study,the L-poly(lactic acid)/polypropylene(PLLA/PP)blends with different weight ratios were prepared by melt mixing and the crystallization behavior of the blends were investigated.Results showed that the crystalline structures of PLLA and PP were not altered by the composition.For the crystallization of PLLA,both the diffusion of chain segments and crystallization rate were enhanced under the existence of PP crystals.For the crystallization of PP,its crystallization rate was depressed under the existence of amorphous PLLA molecular chains.When the PP crystallized from the existence of PLLA crystals,although the diffusion rate of PP was reduced by PLLA crystals,the nucleation positions were obviously enhanced,which accelerated the formation of PP crystals.This investigation would supply more basic data for the application of PLLA/PP blend. 展开更多
关键词 L-poly(lactic acid) POLYPROPYLENE BLENDS Crystalization behavior crystallization acceleration
原文传递
Investigation on crystallization behavior between(Sc_(x)Yb_(1−x))O_(1.5)and CMAS:A new insight in the effect of Sc substitution
20
作者 Guangheng Zhang Jinyu Shi +1 位作者 Jie Zhang Jingyang Wang 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2024年第6期789-799,共11页
Environmental barrier coatings(EBCs)with thermomechanical robustness against calcium–magnesium–aluminum–silicate(CMAS)deposits are in high demand.The aim of this work was to clarify the influence of Sc^(3+)on the c... Environmental barrier coatings(EBCs)with thermomechanical robustness against calcium–magnesium–aluminum–silicate(CMAS)deposits are in high demand.The aim of this work was to clarify the influence of Sc^(3+)on the crystallization behavior of Yb-based coatings against CMAS deposits.The reaction products of solid solutions with compositions traversing the Sc_(2)O_(3)–Yb_(2)O_(3)system indicate that Sc^(3+)tends to form[BO_(6)]coordination polyhedra in the crystal structure to promote the formation of garnet and diopside,while Yb^(3+)occupies 7-,8-,and 9-coordinate sites to crystallize apatite and silicocarnotite.The transformation of crystalline products from apatite/silicocarnotite to garnet/diopside greatly improves the efficiency of CMAS melt consumption and facilitates the prevention of its further penetration and corrosion.Based on the commonality of cation occupancy in crystallography,an A(CaO+YbO_(1.5))–B(ScO_(1.5)+MgO+AlO_(1.5))–T(SiO_(2))pseudoternary phase diagram is established,which has great potential for describing phase equilibrium in coating-deposit systems and can provide guidance for the compositional design of corrosion-resistant coatings. 展开更多
关键词 crystallization behavior cation partitioning scandium-ytterbium oxide(Sc_(x)Yb_(1−x))O_(1.5)solid solution calcium-magnesium-aluminum-silicate(CMAS)deposit pseudoternary phase diagram
原文传递
上一页 1 2 3 下一页 到第
使用帮助 返回顶部