Crystallization and Higher-Order Structure Formation in Multiphase Polymers - Effects of Microphase Separation -

(1)研究了两种具有橡胶和玻璃态无定形组分的嵌段共聚物在微相分离熔体中结晶时形成的高阶结构。前者的嵌段共聚物是在层状熔体结晶时结构重组的，而具有柱状微区结晶成分的嵌段共聚物则是在微区内结晶。另一方面，后一种嵌段共聚物在微区内结晶，无论其微相分离结构是片状还是圆柱状。在后一种嵌段共聚物的结晶过程中，有较小的Avrami指数和较高的表观结晶活化能。(2)在结晶-结晶嵌段共聚物中，当两组分的熔融温度接近时，一种组分优先结晶，另一种组分的结晶次之，从而在ABA三嵌段共聚物中形成类似同心圆的双球晶。(3)成核密度和生长速率均依赖于接枝共聚物结晶过程中的接枝密度。

(1)Formation of higher-order structure on crystallization from microphase-separated melts was studied for both block copolymers having rubbery and glassy amorphous components, respectively. For the former block copolymers the structure was reorganized on crystallization from lamellar melt, while for the block copolymers having a crystalline component in the cylindrical microdomain they crystallized within the microdomain. On the other hand, the latter block copolymers crystallized within the microdomain regardless of their microphase separation structure, lamella or cylinder. In the crystallization of the latter block copolymers a small Avrami exponent and high apparent activation energy of crystallization were observed. (2) In crystalline-crystalline block copolymers where the melting temperatures of both components are close to each other, one component took priority in crystallization, followed by crystallization of the other component, as a result double spherulites like a concentric circle were formed in the ABA triblock copolymer. (3) Both nucleation densities and growth rates depended on the graft density in crystallization of graft copolymers.