Strain hardening in model polymer brushes under shear

被引：60

作者：

Krishnamoorti, R ^{[1
]}

Giannelis, EP

机构：

[1] Univ Houston, Dept Chem Engn, Houston, TX 77204 USA

[2] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

来源：

LANGMUIR | 2001年 / 17卷 / 05期

关键词：

D O I：

10.1021/la0000365

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The nonlinear dynamic response of polymer melt brushes to large amplitude oscillatory shear is studied using melt state rheology of end-tethered polymer layered-silicate nanocomposites. These model melt brushes exhibit reversible strain hardening at moderate strain amplitudes, characterized by the presence of a critical strain amplitude for the transition that is only a function of the interlayer distance (i.e., silicate fraction). These results differ qualitatively from those observed for solvent-filled polymer brushes. A phenomenological explanation based on stretching of already distorted chains in response to the applied shear and predicted on the space filing requirements of s melt brush is provided to explain these unique results.

引用

页码：1448 / 1452

页数：5

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