聚乙烯基环己烷-聚乙烯-聚乙烯基环己烷三嵌段共聚物溶液的受限结晶研究  

Confined Crystallization of Poly(vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane) Triblock Copolymer in Solution

作　　者：于佩潜[1] 李洪胜[1] 王震[1] 谢续明[1] Bates FrankS. 

机构地区：[1]清华大学化工系高分子研究所,北京100084 [2]Department of Chemical Engineering and Materials Science University of Minnesota, MN, USA

出　　处：《高等学校化学学报》2005年第3期583-585,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 1740 2 2 );重大研究计划"理论物理学及其交叉科学若干前沿问题"子课题 (批准号 :90 10 3 0 3 5 );国家自然科学重点基金 (批准号 :10 3 3 40 2 0 )资助 .

摘　　要：The crystallization of poly(vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane)(PVCH-PE-PVCH) triblock copolymer/chloroform solution was investigated. The solvent of the solution system was evaporated at various temperatures. It was found that the crystallinity was decreased with increasing the solvent evaporating temperature. This indicated that the crystallinity depends on the crystallization time because the higher the evaporating temperature, the faster the speed of the solvent evaporating is. However, the melting temperature(T_m) of the block copolymer was found to depend on the competition between the crystallization and the microphase separation. When the evaporating temperature is lower(below 333 K), i.e. the speed of the solvent-evaporating is slow, the PE block crystallized freely and the T_m increased with increasing the solvent evaporating temperature, implying that the T_m only depends on the crystalline temperature. On the other hand, with the increasing temperature up to above 343 K for solvent evaporating, two melting peaks at 356 and 377 K were observed for the crystallization of PVCH-PE-PVCH in the solution. It resulted in that the crystallization and the microphase separation of the block copolymer occurred simultaneously. And the confined and unconfined crystallization coexisted for the samples. The competition of the crystallization and the microphase separation can be controlled through changing the solvent evaporating speed.The crystallization of poly(vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane)(PVCH-PE-PVCH) triblock copolymer/chloroform solution was investigated. The solvent of the solution system was evaporated at various temperatures. It was found that the crystallinity was decreased with increasing the solvent evaporating temperature. This indicated that the crystallinity depends on the crystallization time because the higher the evaporating temperature, the faster the speed of the solvent evaporating is. However, the melting temperature(T_m) of the block copolymer was found to depend on the competition between the crystallization and the microphase separation. When the evaporating temperature is lower(below 333 K), i.e. the speed of the solvent-evaporating is slow, the PE block crystallized freely and the T_m increased with increasing the solvent evaporating temperature, implying that the T_m only depends on the crystalline temperature. On the other hand, with the increasing temperature up to above 343 K for solvent evaporating, two melting peaks at 356 and 377 K were observed for the crystallization of PVCH-PE-PVCH in the solution. It resulted in that the crystallization and the microphase separation of the block copolymer occurred simultaneously. And the confined and unconfined crystallization coexisted for the samples. The competition of the crystallization and the microphase separation can be controlled through changing the solvent evaporating speed.

关 键 词：聚乙烯基环己烷-聚乙烯-聚乙烯基环己烷 微相分离 受限结晶 

分 类 号：O631[理学—高分子化学]