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45. X-ray crystallographic structure of meta- and para-dimethyl ester of pyromellitic acid. Huang WX, Liu TX, Gao LX, Zhang X, Xu JP, Ding MX. CHINESE JOURNAL OF POLYMER SCIENCE 15 (1): 40-49 1997.
The polycrystalline powder of para- and meta-dimethyl ester of pyromellitic acid (PMDE) have been prepared by fractional crystallization, and their crystal structures have been determined by Wide-Angle X-ray Diffraction (WAXD). Both p-PMDE and m-PMDE was found to be orthorhombic crystal system, and their unit cell parameters a = 0.840 nm, b = 0.707 nm, c = 1.136 nm and a = 1.032 nm; b = 0.835 nm, ...
http://www.polymer.cn//ss/liutianxi/publicationsshow_188.html |
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44. X-ray crystallographic structure of cyclic tetramer ester based on bisphenol-A and o-phthaloyldichloride. Jiang HY, Liu TX, Zhang HF, Chen TL, Mo ZS. POLYMER 37 (15): 3427-3429 JUL 1996.
The polycrystalline powder of the cyclic tetramer ester based on bisphenol-A and o-phthaloyldichloride has been prepared by recrystallization from nitrobenzene and its crystal structure determined by wide-angle X-ray diffraction. The unit cell is orthorhombic and has dimensions a=0.967 nm, b=0.8699 nm, c = 2.0859 nm. With two tetramers per unit cell, the crystal density is 1.36 g cm(-3). Indices o...
http://www.polymer.cn//ss/liutianxi/publicationsshow_181.html |
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39. Nonisothermal melt and cold crystallization kinetics of poly(aryl ether ether ketone ketone). Liu TX, Mo ZS, Wang SG, Zhang HF. POLYMER ENGINEERING AND SCIENCE 37 (3): 568-575 MAR 1997.
Analysis of the nonisothermal melt and cold crystallization kinetics of poly(aryl ether ether ketone ketone) (PEEKK) was performed by using differential scanning calorimetry (DSC). The Avrami equation modified by Jeziorny could describe only the primary stage of nonisothermal crystallization of PEEKK. And, the Ozawa analysis, when applied to this polymer system, failed to describe its nonisotherma...
http://www.polymer.cn//ss/liutianxi/publicationsshow_166.html |
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37. Crystallization behavior of a novel poly(aryl ether ketone): PEDEKmK. Liu TX, Mo ZS, Wang SG, Zhang HF, Wang JZ, Na H, Wu ZW. JOURNAL OF APPLIED POLYMER SCIENCE 64 (8): 1451-1461 MAY 23 1997.
Isothermal melt and cold crystallization kinetics of PEDEKmK linked by meta-phenyl and biphenyl were investigated by differential scanning calorimetry in two temperature regions. Avrami analysis is used to describe the primary stages of the melt and cold crystallization, with exponent n = 2 and n = 4, respectively. The activation energies are -118 kJ/mol and 510 kJ/mol for crystallization from the...
http://www.polymer.cn//ss/liutianxi/publicationsshow_160.html |
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35. Isothermal melt and cold crystallization kinetics of poly(aryl ether ether ketone ketone) (PEEKK). Liu TX, Mo ZS, Wang SG, Zhang HF. EUROPEAN POLYMER JOURNAL 33 (9): 1405-1414 SEP 1997.
Isothermal melt and cold crystallization kinetics of PEEKK have been investigated by differential scanning calorimetry in two temperature regions. During the primary crystallization process, the relative crystallinity develops with a time dependence described by the Avrami equation, with exponent n = 2 for both melt and cold crystallization. The activation energies are -544.5 and 466.7 kJ/mol for ...
http://www.polymer.cn//ss/liutianxi/publicationsshow_158.html |
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32. Influence of annealing on structure of poly(aryl ether ether ketone ketone) revealed by SAXS. Liu TX, Mo ZS, Zhang HF, Li G. JOURNAL OF APPLIED POLYMER SCIENCE 69 (9): 1829-1835 AUG 29 1998.
Structural studies of poly(aryl ether ether ketone ketone) (PEEKK) using small-angle X-ray scattering and one-dimensional electron density correlation function methods revealed that its aggregated state structure was significantly influenced by the annealing temperature. The long period L, the average thickness of the lamellae d, the electron density difference between the crystalline and amorphou...
http://www.polymer.cn//ss/liutianxi/publicationsshow_155.html |
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30. Crystal structure and drawing-induced polymorphism in poly(aryl ether ether ketone). IV. Liu TX, Wang SE, Mo ZS, Zhang HF. JOURNAL OF APPLIED POLYMER SCIENCE 73 (2): 237-243 JUL 11 1999.
A new crystal modification induced by strain and denoted as form II exists alongside the dominant form I structure in the uniaxially oriented poly(ether ether ketone) (PEEK) and the related polymers. The crystal structure of form II for PEEK is also found to possess a two-chain orthorhombic packing with unit cell parameters of a equal to 0.475 nm, b equal to 1.060 nm, and c equal to 1.086 nm. More...
http://www.polymer.cn//ss/liutianxi/publicationsshow_152.html |
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25. Micro- and nanomorphologies of isotactic polystyrene revealed by PLM, AFM, and TEM. Liu TX*, Ma KX, Liu ZH, He CB, Chung TS. JOURNAL OF APPLIED POLYMER SCIENCE 86 (2): 422-427 OCT 10 2002.
The spherulitic and lamellar morphologies of isotactic polystyrene (iPS) isothermally crystallized from the glassy state were investigated by polarized light microscopy (PLM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The AFM phase images and TEM bright-field electron micrographs revealed that the iPS spherulites consist of a number of dominant edge-on lamellae whi...
http://www.polymer.cn//ss/liutianxi/publicationsshow_144.html |
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14. Morphology and fracture behavior of intercalated epoxy/clay nanocomposites. Liu TX*, Tjiu WC, Tong YJ, He CB, Goh SS, Chung TS. JOURNAL OF APPLIED POLYMER SCIENCE 94 (3): 1236-1244 NOV 5 2004.
Epoxy/clay nanocomposites were prepared by swelling organoclay in an epoxy resin, diglycidyl ether of bisphenol A, followed by curing with an aromatic hardener, diethyltoluenediamine. A combination of X-ray diffraction with transmission electron microscopy showed the coexistence of intercalated and exfoliated clay morphologies throughout the matrix. In addition, a microscopic and homogeneous dispe...
http://www.polymer.cn//ss/liutianxi/publicationsshow_128.html |
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6. A processing-induced clay dispersion and its effect on the structure and properties of polyamide 6. Liu TX*, Tjiu WC, He CB, Na SS, Chung TS. POLYMER INTERNATIONAL 53 (4): 392-399 APR 2004.
The nanostructures and morphologies of polyamide 6 (PA6)/organoclay nanocomposites prepared by melt compounding have been studied by using X-ray diffiraction (XRD) and transmission electron microscopy (TEM). A combination of XRD and TEM indicates that an exfoliated clay morphology dominates at low clay loadings (less than or equal to5wt%) and a mixture of intercalated and exfoliated structures exi...
http://www.polymer.cn//ss/liutianxi/publicationsshow_116.html |
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