片状蠕虫状胶束：溶液结构的小角中子散射研究
Patchy worm-like micelles: solution structure studied by small-angle neutron scattering
摘要：
三嵌段共聚物表现出丰富的自组织行为，包括形成迷人的圆柱形核壳结构和相分离的冠。聚苯乙烯-（嵌段）-聚乙烯-（嵌段）-聚甲基丙烯酸甲酯三嵌段共聚物（简称SEMs = Styrene-Ethylene-Methacrylates）在溶液中经结晶诱导自组装后，用透射电镜观察到了由聚苯乙烯和聚甲基丙烯酸甲酯组成的蠕虫状核壳胶束。然而，解决方案的结构仍然是一个有争议的问题。在这里，我们提出了一种方法来区分在原位Janus型（两个方面）和补丁（多个隔间）配置的电晕。为了区分这两种模式的散射强度必须主要由一个电晕室。小角中子散射中的对比度变化使我们能够专注于SEM的一个隔间。结果证实了解中也存在斑片结构。
英文摘要：
Triblock terpolymers exhibit a rich self-organization behavior including the formation of fascinating cylindrical core-shell structures with a phase separated corona. After crystallization-induced self-assembly of polystryrene-(block)-polyethylene-(block)-poly(methyl methacrylate) triblock terpolymers (abbreviated as SEMs = Styrene-Ethylene-Methacrylates) from solution, worm-like core-shell micelles with a patchy corona of polystryrene and poly(methyl methacrylate) were observed by transmission electron microscopy. However, the solution structure is still a matter of debate. Here, we present a method to distinguish in-situ between a Janus-type (two faced) and a patchy (multiple compartments) configuration of the corona. To discriminate between both models the scattering intensity must be determined mainly by one corona compartment. Contrast variation in small-angle neutron scattering enables us to focus on one compartment of the SEMs. The results validate the existence of the patchy structure also in solution.
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