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

嵌段共聚物由于组分间的化学不相容性而发生微相分离，组装成各种有序的纳米结构，如球、圆柱、层及双连续结构等．半晶型嵌段共聚物由于引入了能结晶的组分，使体系中存在两种相互竞争的过程，即微相分离与结晶，所以能形成更为丰富的有序结构．聚乙烯基环己烷-聚乙烯-聚乙烯基环己烷Poly(Vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane)，

Confined Crystallization of Poly(vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane) Triblock Copolymer in Solution1

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.