SLOW SPREADING OF POLYMER MELTS

被引:55
作者
BRUINSMA, R [1 ]
机构
[1] UNIV CALIF LOS ANGELES, CTR SOLID STATE SCI, LOS ANGELES, CA 90024 USA
关键词
D O I
10.1021/ma00203a047
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We discuss the precursor film profiles expected to be encountered during the spreading of large N polymer melts. We introduce a new control parameter: the ratio f of bulk to substrate monomer mobility. As a function of f, a variety of shapes are encountered. For f-1, the sliding profile of Brochard and de Gennes is recovered. With increasing f the macroscopic foot predicted by Brochard and de Gennes diminishes in height and eventually vanishes. For large f, the precursor is found to spread by a new mechanism: reptation instead of hydrodynamic flow. The new precursor profile is characterized by a shoulder or step with a height on the order of the radius of gyration of the polymers. © 1990, American Chemical Society. All rights reserved.
引用
收藏
页码:276 / 280
页数:5
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