Self-assembly of ABA triblock copolymers under soft confinement
Self-assembly of ABA triblock copolymers under soft confinement
复制标题
软约束下ABA三嵌段共聚物的自组装
DOI：
10.1016/j.chemphys.2015.02.019
复制
发表时间：
2015-05-01
期刊：
影响因子：
2.3
通讯作者：
Zhu, Yutian
中科院分区：
文献类型：
--
作者：
Sheng, Yuping;An, Jian;Zhu, Yutian
采用蒙特卡罗方法研究了ABA三嵌段共聚物在软约束条件下的自组装过程。软约束是通过聚合物的不良溶剂环境实现的，这使得聚合物聚集成液滴。考察了嵌段长度比、嵌段B的溶剂质量、嵌段A和嵌段B之间的不相容性等对软约束诱导的胶束结构的影响。通过提高B嵌段的溶剂质量，A(5)B(8)A(5)三嵌段共聚物的胶束结构由叠合的片层转变为花蕾状结构，再转变为洋葱状结构，而A(7)B(4)A(7)三嵌段共聚物的内部胶束结构由球形相转变为各种柱状相，如内部单螺旋、双螺旋、叠合环和笼状结构。此外，还研究了一些典型聚集体的形成途径，以说明它们的生长机制。(C) 2015 Elsevier B.V.版权所有
Using Monte Carlo method, the self-assembly of ABA triblock copolymers under soft confinement is investigated in this study. The soft confinement is achieved by a poor solvent environment for the polymer, which makes the polymer aggregate into a droplet. Various effects, including the block length ratio, the solvent quality for the blocks B, and the incompatibility between blocks A and B, on the micellar structures induced by soft confinement are examined. By increasing the solvent quality of B blocks, the micellar structure transforms from stacked lamella to bud-like structure, and then to onion-like structure for A(5)B(8)A(5) triblock copolymers, while the inner micellar structure changes from spherical phase to various cylindrical phase, such as inner single helix, double helixes, stacked rings and cage-like structures, for A(7)B(4)A(7) triblock copolymers. Moreover, the formation pathways of some typical aggregates are examined to illustrate their growth mechanisms. (C) 2015 Elsevier B.V. All rights reserved.