Crystallization and higher-order structure of multicomponent polymeric systems
Crystallization and higher-order structure of multicomponent polymeric systems
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DOI：
10.1016/j.polymer.2013.06.031
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发表时间：
2013-08
期刊：
影响因子：
4.6
通讯作者：
Hiroki Takeshita;T. Shiomi;K. Takenaka;F. Arai
中科院分区：
文献类型：
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作者：
Hiroki Takeshita;T. Shiomi;K. Takenaka;F. Arai
多组分聚合物体系中的高阶结构受动力学因素和热力学因素的制约，因为聚合物中的结晶和分子扩散都相对缓慢。在结晶/非晶聚合物共混物中，高阶结构是由结晶速率和链扩散速率之间的竞争或相互作用形成的。非晶链能否包含在晶间片层、纤维间区或球晶外，是由这些动力学因素决定的。在结晶-非晶嵌段共聚物中，高阶结构是结晶和微相分离（MS）相结合形成的。当从微相分离熔体中结晶嵌段共聚物时，熔体中的质谱结构是否保持也是由动力学因素决定的，并取决于质谱结构。质谱结构中的结晶必须发生在与链尺寸相当的有限域内。这种受限结晶的动力学是特别令人感兴趣的。在聚合物共混物的结晶与液-液相分离（LLPS）同时发生时，预计LLPS会影响结晶速率。结晶/结晶嵌段共聚物和聚合物共混物的结构是由两组分结晶速率之间的竞争形成的。本文着重从动力学方面综述了多组分聚合物体系的结晶行为和高阶结构的形成。
The higher-order structure in multicomponent polymeric systems is governed by the kinetic as well as thermodynamic factors, because both crystallization and molecular diffusion are relatively slow in polymers. In crystalline/amorphous polymer blends, the higher-order structure is formed by the competition or interplay between the crystallization and chain diffusion rates. Whether amorphous chains can be contained in the inter-crystalline lamellae, interfibrillar region or outside of the spherulite is determined by such kinetic factors. In crystalline-amorphous block copolymers, the higher-order structure is formed by the combination of the crystallization and microphase separation (MS). When the block copolymer is crystallized from microphase-separated melts, whether the MS structure in the melt is kept or not is also determined by the kinetic factors and depends on the MS structure. The crystallization in the MS structure must occur within the limited domain whose size is comparable to that of the chain dimension. The kinetics of such confined crystallization is of particular interest. In the crystallization occurring simultaneously with liquid–liquid phase separation (LLPS) in the polymer blend, it is expected that LLPS affects the crystallization rate. The structure of crystalline/crystalline block copolymers and polymer blends is formed by the competition between the crystallization rates of both components. In this paper, the behavior of crystallization and the formation of higher-order structure in multicomponent polymeric systems are reviewed especially in the kinetic aspect.