SYNTHESIS OF SIDE-CHAIN LIQUID-CRYSTAL POLYMERS BY LIVING RING-OPENING METATHESIS POLYMERIZATION .2. INFLUENCE OF MOLECULAR-WEIGHT, POLYDISPERSITY, AND FLEXIBLE SPACER LENGTH (N = 9-12) ON THE THERMOTROPIC BEHAVIOR OF THE RESULTING POLYMERS

被引:69
作者
KOMIYA, Z [1 ]
PUGH, C [1 ]
SCHROCK, RR [1 ]
机构
[1] MIT,DEPT CHEM 6331,CAMBRIDGE,MA 02139
关键词
D O I
10.1021/ma00050a031
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The living ring-opening metathesis polymerization of 5-[[[n-[(4'-methoxy-4-biphenylyl)oxy]-alkyl]oxy]carbonyl]bicyclo[2.2.1]hept-2-ene (1-n, n = 9-12) with Mo(CH-t-Bu)(NAr)(O-t-BU)2 (Ar = 2,6-C6H3-i-Pr2) is described. Polymers with degrees of polymerization from 5 to 100 and narrow molecular weight distributions (M(w)/M(n) = 1.07-1.28) were obtained in high yield. All polymers exhibit side-chain crystallization along with a nematic or smectic mesophase. Isotropization temperatures increase with increasing molecular weight and then become independent of molecular weight at approximately 30-50 repeat units. Side-chain crystallization is suppressed as molecular weight increases.
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页码:6586 / 6592
页数:7
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