Effects of the positive feedback loop in polymerization on the reaction-induced phase separation of polymer mixtures.
Effects of the positive feedback loop in polymerization on the reaction-induced phase separation of polymer mixtures.
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DOI：
10.1063/1.4921175
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发表时间：
2015-05
期刊：
影响因子：
2.9
通讯作者：
Y. Furubayashi;R. Kawakubo;H. Nakanishi;T. Norisuye;Qui Tran‐Cong‐Miyata
中科院分区：
文献类型：
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作者：
Y. Furubayashi;R. Kawakubo;H. Nakanishi;T. Norisuye;Qui Tran‐Cong‐Miyata
由客体聚合物溶解在主体聚合物的单体中组成的混合物的相分离由光聚合引起。从聚合动力学，它被发现，对于主体聚合物的玻璃化转变温度（Tg）高于实验温度，Trommsdorff-Norrish效应出现，提供了一种方法来终止相分离的过程中的各个中间阶段，从而可以构建各种形态。对于具有低于实验温度的（Tg）的主体聚合物，形态的冻结过程是不完全的，导致在已经由初级过程产生的域内部的次级相分离。这种二次相分离的动力学表明，通过亚稳分解产生的特殊形态，如“阳光明媚的一面向上的鸡蛋”样的结构。实验结果表明，光致聚合与相分离的竞争可以为微米和亚微米尺度的材料设计提供一种有用的方法。
Phase separation of mixtures composed of a guest polymer dissolved in monomer of a host polymer was induced by photopolymerization. From the polymerization kinetics, it was found that for the host polymer with the glass transition temperature (Tg) higher than the experimental temperature, the Trommsdorff-Norrish effect emerges, providing a method to terminate the phase separation at various intermediate stages of the process and thereby a variety of morphologies can be constructed. For the host polymers with (Tg) lower than the experimental temperature, the freezing process of morphology is not complete, leading to the secondary phase separation inside the domains already generated by the primary process. The kinetics of this secondary phase separation indicates that the peculiar morphology like "sunny-side-up egg"-like structures was generated via spinodal decomposition. The experimental results obtained in this study show that the competition between photopolymerization and phase separation can provide a useful method of materials design in the micro- and sub-micrometer scales.