STRUCTURE RELAXATION AFTER TEMPERATURE JUMPS IN HOMOGENEOUS POLYSTYRENE POLY(STYRENE-CO-BROMOSTYRENE) BLENDS

被引：15
|
作者：
STROBL, GR [1 ]
URBAN, G [1 ]
机构：
[1] UNIV MAINZ,INST PHYS CHEM,D-6500 MAINZ,FED REP GER
来源：
COLLOID AND POLYMER SCIENCE | 1988年 / 266卷 / 05期
关键词：
MIXTURES - Structure - POLYMERS - X-Ray Analysis - RELAXATION PROCESSES - Mathematical Models - X-RAYS - Scattering;
D O I：
10.1007/BF01457255
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Concentration fluctuations in polymer blends and their change after a temperature jump were studied by time-dependent small angle X-ray scattering experiments. Measurements were conducted on homogeneous mixtures of polystyrene and a partially brominated derivative. Structure factors in thermal equilibrium show the form given by the random phase approximation. Relaxation occurs on the time scale of minutes and is nonexponential, becoming slower with time. Initial relaxation rates increase with increasing scattering vectors in accordance with theoretical predictions.
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页码：398 / 404
页数：7
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