STUDY OF CONCENTRATION FLUCTUATIONS DURING THE THERMAL POLYMERIZATION OF STYRENE USING PHOTON-CORRELATION SPECTROSCOPY

被引：17
|
作者：
PATTERSON, GD
STEVENS, JR
ALMS, GR
LINDSEY, CP
机构：
[1] Bell Laboratories, Murray Hill, New Jersey
[2] Department of Physics, University of Guelph, Ontario, Guelph
[3] Elastomer Chemical Department, E. I. duPont de Nemours and Co, Experimental Station, Delaware, Wilmington
来源：
MACROMOLECULES | 1979年 / 12卷 / 04期
关键词：
D O I：
10.1021/ma60070a020
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The cooperative diffusion coefficient Dc for concentration fluctuations is studied as a function of polymer concentration during the thermal polymerization of styrene using photon correlation spectroscopy. Measurements were carried out from the semidilute region to approximately 90% polymer. From 2-10%, polymer Dcrose linearly with concentration. The value of Dceventually reached a plateau with a value of 4.5 × 10-6cm2/s which corresponds to a minimum dynamic screening length between 10 and 15. At higher polymer concentrations, the local viscosity increases sharply, and the value of Dcfalls accordingly. © 1979, American Chemical Society. All rights reserved.
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页码：658 / 661
页数：4
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