STEREOREGULAR POLY（CYCLOHEXENE CARBONATE）S： UNIQUE CRYSTALLIZATION BEHAVIOR

An example of crystalline CO2-based polymer from the asymmetric alternating copolymerization of CO2 and cyclohexene oxide is reported. Isotacticity of poly（cyclohexene carbonate） （PCHC） has the critical influence on the crystallinity, and only copolymers with a isotacticity of more than 90% are crys...

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Bibliographic Details
Published in:高分子科学：英文版 2012, Vol.30 (4), p.487-492
Main Author: Guang-pengWu Shi-dong Jiang Xiao-bing Lu Wei-min Ren Shou-ke Yan
Format: Article
Language:English
Subjects:
二氧化碳共聚物
活性聚合物
热塑性塑料
热塑性工程塑料
环己烯
环氧环己烷
结晶行为
聚碳酸酯
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Summary:An example of crystalline CO2-based polymer from the asymmetric alternating copolymerization of CO2 and cyclohexene oxide is reported. Isotacticity of poly（cyclohexene carbonate） （PCHC） has the critical influence on the crystallinity, and only copolymers with a isotacticity of more than 90% are crystallizable. The stereoregular PCHC is a typical semi-crystalline thermoplastic, and possesses a high melting point （Tin） of 215-230℃ and a decomposition temperature of ca. 310℃. The spherulitic morphology of （R）-PCHC grows in a clockwise spiral from a center, and that of （S）-PCHC is a counterclockwise spiral, while the stereocomplex of （S）-PCHC/（R）-PCHC （1/1 mass ratio） presents lath-like dendritic crystal. The novel crystalline CO2-based polycarbonate represents a rare example of optically active polymers with unique crystallization behavior. Our findings reflect the critical influence of stereoregularity on the crystallization for this kind of polymeric materials, and may lead to developments of thermal-resistance CO2 copolymers for application in engineering thermoplastics.
ISSN:0256-7679
1439-6203