Self-assembly of amphiphilic ABC star triblock copolymers and their blends with AB diblock copolymers in solution: Self-consistent field theory simulations
Self-assembly of amphiphilic ABC star triblock copolymers and their blends with AB diblock copolymers in solution: Self-consistent field theory simulations
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两亲性 ABC 星形三嵌段共聚物及其与 AB 二嵌段共聚物的共混物在溶液中的自组装：自洽场论模拟
DOI：
10.1021/jp067650v
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发表时间：
2007-02-22
影响因子：
3.3
通讯作者：
Yang, Yuliang
中科院分区：
文献类型：
--
作者：
Ma, Jian Wai;Li, Xuan;Yang, Yuliang
通过自洽场理论 (SCFT) 模拟的二维实空间实现，研究了由亲水性 A 嵌段和疏水性 B 和 C 嵌段组成的两亲性 ABC 星形三嵌段共聚物的自组装形态，以及与其对应的线性 AB 二嵌段共聚物在溶液中的共混物。星形三嵌段共聚物在溶液中自组装，形成各种胶束结构，从汉堡包，到分段蠕虫状，到环形分段胶束，最后到嵌段B和C的疏水长度同时增加的囊泡。当疏水嵌段B和C的长度不对称时，发现了特定的串珠蠕虫胶束。特别是，当星形ABC三嵌段共聚物处于强偏析状态且B和C嵌段均具有强疏水性时，会获得相当长的分段蠕虫状胶束，这在之前研究的二嵌段和线性ABC三嵌段共聚物溶液中未发现。此外，具有分散在核心上的珠子的覆盆子胶束也出现在块状星形 ABC 三嵌段共聚物的强偏析区域中。此外，ABC星形三嵌段共聚物的聚集体形态受到线性AB二嵌段共聚物添加的强烈影响。最显着的特点是，加入AB二嵌段共聚物后，长节段的蠕虫会变短，形成汉堡胶束。这些模拟与洛奇小组的实验结果非常吻合。
The self-assembled morphologies of amphiphilic ABC star triblock copolymers consisting of hydrophilic A blocks and hydrophobic B and C blocks and the blends with their counterpart linear AB diblock copolymers in solution are investigated by 2D real-space implementation of self-consistent field theory (SCFT) simulation. The star triblock copolymers self-assemble in solution to form various micellar structures from hamburger, to segmented wormlike, to toroidal segmented micelles, and finally to vesicles with simultaneously increasing hydrophobic lengths of blocks B and C. When the length of hydrophobic blocks B and C is asymmetric, specific bead-on-string worm micelles are found. Particularly, when the star ABC triblock copolymer is in a strong segregation regime and both B and C blocks are strongly hydrophobic, quite long segmented wormlike micelles are obtained, which had not been found in previously investigated diblock and linear ABC triblock copolymers solution. Additionally, raspberry micelles with beads dispersed on the core also occur in the strong segregation regime of bulk star ABC triblock copolymers. Furthermore, the aggregate morphology of ABC star triblock copolymers is strongly influenced by the addition of linear AB diblock copolymers. The most significant feature is that the long segmented worms will become shorter, to form hamburger micelles with the addition of AB diblock copolymers. These simulations are in good agreement with the experimental findings by Lodge's group.