Structure Formation and Its Control in Combined Phase Transition in Block Copolymers Blends

采用时间分辨同步小角x射线散射技术和差示扫描量热法研究了含结晶-非晶态嵌段共聚物共混物在大相分离、微相分离和结晶过程中的微相结构及其形成过程。对于含有橡胶非晶组分的体系，结晶是否破坏熔体的微相分离结构取决于其形貌、分子量和温度；结晶发生在圆柱形结构内。另一方面，对于含有非晶态成分的体系，熔体结构完全保持不变。结构的形成不受微相分离的影响；两种相分离结构在结晶后仍能共存。本研究表明，以熔体微相结构为模板，可以在纳米尺度上有规律地排列晶体相。

Microphase structure and its formation process in combination of macrophase separation, microphase separation and crystallization were investigated for polymer blends containing crystalline-amorphous block copolymers using mainly time-resolved synchrotron small-angle X-ray scattering technique and diffferantial scanning calorimetry. For the systems with a rubbery amorphous component, whether or not crystallization destroyed microphase separation structure in melt depended on its morphology, molecular weight and temperature ; crystallization occurred within cylindrical structure. On the other hand, melt structure was maintained completely for the systems with a glassy amorphous component. The structure formation was not affected by occurrence of microphase separation ; two kinds of miaophase separation structure could coexist even after crystallization. The present study revealed that the crystalline phase could be ananged regularly in the nano-order scale using melt microphase structure as a template.