Dissipative particle dynamics simulation of the relaxation behaviour of a triblock copolymer supramolecular network
Dissipative particle dynamics simulation of the relaxation behaviour of a triblock copolymer supramolecular network
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DOI：
10.1080/08927022.2017.1403027
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发表时间：
2018-05
影响因子：
2.1
通讯作者：
Kohei Wakimoto;Hiroshi Sasaki;N. Arai
中科院分区：
文献类型：
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作者：
Kohei Wakimoto;Hiroshi Sasaki;N. Arai
由于嵌段共聚物自组装成各种纳米结构，并广泛应用于化妆品和油漆等软材料中，因此它们继续成为推动新技术发展的基础研究课题。ABA三嵌段共聚物自组织成超分子网络，其中交联结构在加热和其他外部刺激下发生变化。由ABA三嵌段共聚物组成的超分子网络有三个组成部分：桥、环和悬架。这些超分子网络具有结构区域（簇），其中聚合物链的末端块聚集并由聚合物链的内部块连接。尽管弛豫行为在聚合物材料的测量和控制过程中很重要，但这些系统的分子水平行为尚未得到解决。我们观察到这些聚合物的末端从簇中分离的拉出现象，并通过计算分离次数来估计特征分离时间，并将其与该系统的最长弛豫时间进行比较。
Abstract Since block copolymers self-assemble into various nanostructures and these are widely used in soft materials such as cosmetics and paints, these continue to be the subjects of fundamental studies that progress new technologies. ABA triblock copolymers self-organise into supramolecular networks in which crosslinked structures change upon heating and other external stimulation. Supramolecular networks that consist of ABA triblock copolymers have three components: bridges, loops and dangles. These supramolecular networks have structural regions (clusters) in which end blocks of polymer chains are aggregated and connected by the internal blocks of the polymer chains. Despite of the importance of relaxation behaviour during the measurement and control of polymer materials, the molecular-level behaviour of these systems has not been addressed. We observed pull-out phenomenon that the ends of these polymers detach from clusters, and estimated characteristic detachment times by counting the number of detachments and compared it with the time of longest relaxation in that system.