Near-surface dynamics of sheared polymer melts using ATR/FTIR

被引：12
|
作者：
Wise, GM
Denn, MM [1 ]
Bell, AT
机构：
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Chem Engn, Berkeley, CA 94720 USA
来源：
AICHE JOURNAL | 1998年 / 44卷 / 03期
关键词：
D O I：
10.1002/aic.690440318
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Using attenuated total-reflectance infrared spectroscopy (ATR/FTIR), the concentration of deuterated polybutadiene near the surface of a flat zinc selenide crystal was followed as it was replaced by ordinary polybutadiene by flow and diffusion. Experiments were performed in the melt, both below (M similar to 1,500) and above (M similar to 15,000) the entanglement threshold. The decay profiles agree well with a finite-element simulation of the system. In contrast to previous investigations of C-16's, the decay profiles of both unentangled and entangled polybutadienes are consistent with a uniform diffusivity in the near-wall region.
引用
收藏
页码：701 / 710
页数：10
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