STRUCTURE PROPERTY RELATIONSHIPS FOR STYRENE CROSS-LINKED POLYESTERS .1. NETWORK STRUCTURE AND RUBBERY ELASTIC-MODULUS

被引:22
作者
BELLENGER, V
MORTAIGNE, B
GRENIERLOUSTALOT, MF
VERDU, J
机构
[1] ETCA CTME,CREA,F-94114 ARCUEIL,FRANCE
[2] LCOP,F-64000 PAU,FRANCE
关键词
D O I
10.1002/app.1992.070440411
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Ten unsaturated polyester prepolymers differing by the nature of the diol, by the maleate/phthalate molar ratio, or by the chain length, were crosslinked by about 40% by weight of styrene and then analyzed by IR spectrophotometry, solid state NMR, and rubbery elasticity measurements. The spectrometric measurements revealed a practically complete conversion of the styrene/fumarate copolymerization. The rubbery elastic modulus varies in a complex way with the presumed network structure. A non-ideality factor f was defined from the current theories; f is a decreasing function of the average number of flexible bonds between crosslinks. The networks based on dimeric diols display a practically ideal behavior. The influence of dangling chains, corresponding essentially to polyester chain ends, is taken into account by the Graessley's formula in which trifunctional and tetrafunctional crosslinks are distinguished. A method for the estimation of the nature and weight fraction of dangling chains was proposed.
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页码:643 / 651
页数:9
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