COPOLYMERIZATION OF HEXAFLUOROISOBUTYLENE AND VINYL-ACETATE

被引：8
作者：
WU, CJ
BRAMBILLA, R
YARDLEY, JT
机构：
[1] Research and Technology, Allied-Signal, Inc., Morristown
来源：
MACROMOLECULES | 1990年 / 23卷 / 04期
关键词：
D O I：
10.1021/ma00206a017
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Alternating copolymers of hexafluoroisobutylene (HFIB, monomer B) and vinyl acetate (VA, monomer A) were prepared under homogeneous radical conditions, and their structures were studied. The microstructure of the copolymers was studied by proton, carbon-13, and fluorine NMR. Monomer reactivity ratios were determined by a nonlinear least-squares procedure and from an analysis of the sequence distributions. The results support a penultimate model in which raa = 0.0066, rba = 0.0405, and rbb = rab = 0. Configurational studies indicated that the stereochemistry of the alternating copolymers is not random and the tacticity is related to polymerization temperature. Bulk properties of the copolymers were examined by DSC, dielectric relaxation, and the XRD method. Alternating copolymers of HFIB and vinyl alcohol were also prepared. © 1990, American Chemical Society. All rights reserved.
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页码：997 / 1004
页数：8
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