Structural relaxation and dynamic heterogeneity in a polymer melt at attractive surfaces

被引：81
|
作者：
Smith, GD [1 ]
Bedrov, D [1 ]
Borodin, O [1 ]
机构：
[1] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 22期
关键词：
D O I：
10.1103/PhysRevLett.90.226103
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Molecular dynamics simulations of polymer melts at flat and structured surfaces reveal that, for the former, slow dynamics and increased dynamic heterogeneity for an adsorbed polymer is due to densification of the polymer in a surface layer, while, for the latter, the energy topography of the surface plays the dominant role in determining dynamics of interfacial polymer. The dramatic increase in structural relaxation time for polymer melts at the attractive structured surface is largely the result of dynamic heterogeneity induced by the surface and does not resemble dynamics of a bulk melt approaching T-g.
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页数：4
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