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INCREASED SPHERULITIC GROWTH RATES OF SEMICRYSTALLINE POLYMER DUE TO ENHANCED LIMITED LOCAL CHAIN SEGMENTAL MOBILITY AT THE INTERFACE OF DOUBLE-LAYER THIN FILMS

引用

Chinese Journal of Polymer Science 2013年第9期31卷 1276-1283页

作者： Ya-qiong Zhang Zhi-gang Wang CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China

In this work the nucleation and growth of spherulite. for the below polylactide （PLA） layer in poly（ε- caprolactone）/polylactide （PCL/PLA） double-layer films during isothermal crystallization at various temperatures above the melting point of PCL have been investigated by using polarized optical microscopy （POM）. It is revealed that two types of spherulitic morphologies are observed in PCL/PLA double-layer films. One is the well defined highly birefringent spherulite., and the other one is the coarse spherulite.. It is interesting to find that the spherulitic growth rate of the coarse spherulite. is higher than that of the well defined spherulite.. It is thought that the coarse spherulite. nucleate and grow with the assistance of the interfaces between the PCL and PLA layers, and the well defined highly birefringent spherulite. only nucleate and grow in the PLA layer.

关键词： Polylactide Poly(ε-caprolactone) Interface Crystallization spherulite.

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POLYCAPROLACTAM MODIFIED BY POLYPHENYLQUINOXALINE

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Chinese Journal of Polymer Science 1990年第1期8卷 87-92页

作者：杨桂生卢凤才 Institute of Chemistry Academia Sinica Beijing

Three polycaprolactam samples modified by 0.05—0.50% polyphenylquinoxaline(PPQ)by weight were *** structure and mechanical properties were characterized by FT-IR, SEM, density, tensile, impact, DTAand visco-elastic method, PPQ induced the formation of 'crystal grains' distributed evenly over nylon spherulite. in modified samples, which were observed for the first time, and strengthened modified samples. Modified nylons had higher crystallinities, higher T_g, more nearly perfect spherulite. than MC nylon itself, and showed typical reinforcing effect on mechanical properties.

关键词： Polycaprolactam Polyphenylquinoxaline Modified MC nylon spherulite.

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