Thermal-History Dependence of Phase Separation Induced by Radical Polymerization of 2-Chlorostyrene in the Presence of Polystyrene
Thermal-History Dependence of Phase Separation Induced by Radical Polymerization of 2-Chlorostyrene in the Presence of Polystyrene
复制标题
聚苯乙烯存在下 2-氯苯乙烯自由基聚合引发的相分离的热史依赖性
DOI：
10.1021/ma002054z
复制
发表时间：
2001
期刊：
影响因子：
5.5
通讯作者：
T. Sakaguchi
中科院分区：
文献类型：
--
作者：
M. Okada;T. Sakaguchi
研究了聚苯乙烯存在下2-氯苯乙烯自由基聚合引起相分离的热历史依赖关系，在相分离过程中逐步温度变化（跳变）到更高的温度T2。当第一相分离温度T1持续时间超过一定值T1 *时，富聚（2-氯苯乙烯）畴的形态结构在温度变化后由液滴变为连续畴。随着富聚（2-氯苯乙烯）相体积的增大，形貌向连续结构域转变。聚合反应结束后，即使温度升高，体积也会增加。温度跃迁后形态变化所需的最小持续时间t1*随t1增加而增加，但与T2关系不大。根据两种相隔材料的黏度依赖性的差异，对实验结果进行了解释。
Thermal-history dependence of phase separation induced by radical polymerization of 2-chlorostyrene in the presence of polystyrene was studied by making a stepwise temperature change (jump) to a higher temperature T2 during the phase separation. Morphological structure of poly(2-chlorostyrene)-rich domains changed from droplets to continuous domains after the temperature change if the duration at the first phase-separation temperature T1 was longer than a certain value t1*. The morphological change to the continuous domains was accompanied by an increase of the volume of poly(2-chlorostyrene)-rich phase. The increase of the volume was observed even when temperature was jumped after the polymerization reaction finished. The minimum duration t1* at T1 required for the morphological change to occur after the temperature jump increased with T1 but scarcely depended on T2. An explanation for the experimental results was proposed on the basis of the difference in the viscosity dependence between the phase-separ...