POLYMER MELT DEVOLATILIZATION MECHANISMS

被引:35
作者
ALBALAK, RJ
TADMOR, Z
TALMON, Y
机构
[1] Department of Chemical Engineering, Technion, Israel Institute of Technology, Haifa
[2] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
关键词
D O I
10.1002/aic.690360904
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Scanning electron microscopy (SEM) was used to study the mechanism of falling‐strand devolatilization of polymer melts. Polystyrene and low‐density polyethylene were enriched with styrene and hexane, respectively, and were subsequently extruded as thin strands at various conditions. The polymer strands were exposed to superheat conditions for preset periods of time ranging from tenths to tens of seconds. The strands were then frozen, fractured, and studied by SEM. Devolatilization was found to proceed through a blistering mechanism, both on the surface of the strands and on the surfaces of volatile bubbles formed within the core of the melt. At all volatile concentrations surface blistering and foaming preceded bubble growth in the core, and occurred before the strands foamed. A mechanism for the observed polymer melt devolatilization is proposed. Copyright © 1990 American Institute of Chemical Engineers
引用
收藏
页码:1313 / 1320
页数:8
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