Influence of entanglements on the viscoelastic relaxation of polyurethane melts and gels

被引：12
|
作者：
Gasilova, E
Benyahia, L
Durand, D
Nicolai, T [1 ]
机构：
[1] Univ Maine, CNRS, UMR, F-72085 Le Mans 9, France
[2] Russian Acad Sci, Inst Macromol Cpds, St Petersburg 199004, Russia
来源：
MACROMOLECULES | 2002年 / 35卷 / 01期
关键词：
D O I：
10.1021/ma011412a
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 frequency dependence of the shear modulus was studied for cross-linked polyurethane melts and gels at various cross-link densities. The polyurethane used in this study was based on mixtures of bifunctional linear poly(propylene oxide) (PPO) and trifunctional star PPO end-linked with diisocyanate. The connectivity extent was varied by varying the stoichiometric ratio of hydroxyl groups and isocyanate groups. The results were compared with mean field theory predictions. Relaxation of trapped entanglements was observed for almost fully end-linked systems containing a very low concentration of trifunctional PPO.
引用
收藏
页码：141 / 150
页数：10
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