Real-time dynamic light scattering on gelation and vitrification

Real-time dynamic light scattering on gelation and vitrification
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DOI：
10.1016/j.polymer.2005.01.018
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发表时间：
2005-03-10
期刊：
POLYMER
影响因子：
4.6
通讯作者：
Norisuye, T
Norisuye, T
中科院分区：
化学2区
文献类型：
--
作者：
Shibayama, M;Ozeki, S;Norisuye, T

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用时间分辨动态光散射方法研究了本体自由基聚合过程中二乙烯基苯(DVB；支链)的凝胶化和苯乙烯(St；直链)的玻璃化。在聚合过程中每30s获得一次强度关联函数(ICF)。DVB体系在ICF中表现出以凝胶化阈值为特征的幂律行为，随后发生玻璃化。在ST的情况下，玻璃化前出现了两种松弛模式，分别为合作松弛模式和慢松弛模式。(C)2005爱思唯尔有限公司。保留所有权利。
The time-resolved dynamic light scattering has been employed to investigate gelation of divinylbenzene (DVB; branched chains) and vitrification of styrene (St; linear chains) during radical polymerization in bulk. The intensity correlation function (ICF) was obtained every 30s during polymerization process. The DVB system exhibited a power law behavior in ICF characteristic of gelation threshold, which was followed by vitrification. In the case of St, two relaxation modes appeared before vitrification, which were assigned to be the cooperative and the slow relaxation modes. (c) 2005 Elsevier Ltd. All rights reserved.