Self-assembly of T-shaped rod-coil block copolymer melts.
Self-assembly of T-shaped rod-coil block copolymer melts.
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DOI：
10.1063/1.3247192
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Yin Xia;Jizhong Chen;Zhao‐Yan Sun;T. Shi;L. An;Yuxi Jia
中科院分区：
文献类型：
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作者：
Yin Xia;Jizhong Chen;Zhao‐Yan Sun;T. Shi;L. An;Yuxi Jia
利用三维空间中的自洽场晶格技术，研究了T型棒-线圈嵌段共聚聚合物熔体的自组装行为。与锚点位于一端的棒线圈嵌段共聚物相比，锚点位于棒中部的共聚物表现出明显不同的相行为。当棒材体积分数较低时，侧线圈的空间位阻阻止棒材堆积成条状或胶束，这与棒材-盘条嵌段共聚物的情况不同。随着棒材体积分数的增加，界面能和熵之间的竞争导致层状结构的形成和层状层厚度的增加。当棒的体积分数较高时，平面界面的接枝密度降低，从而导致空间填充要求和拉伸惩罚，从而导致具有固化界面的非片层结构的稳定性。此外，我们的结果还表明，当棒材体积分数较低时，链结构对自组装行为的影响是显著的，而当棒材体积分数较高时，影响较小。
Self-assembled behavior of T-shaped rod-coil block copolymer melts is studied by applying self-consistent-field lattice techniques in three-dimensional space. Compared with rod-coil diblock copolymers with the anchor point positioned at one end, the copolymers with the anchor point at the middle of the rod exhibit significantly different phase behaviors. When the rod volume fraction is low, the steric hindrance of the lateral coils prevents the rods stacking into strip or micelle as that in rod-coil diblock copolymers. The competition between interfacial energy and entropy results in the formation of lamellar structures and the increasing thickness of the lamellar layer with increasing rod volume fraction. When the rod volume fraction is high, the graft density of the planar interface is decreased, which results in space-filling requirements and stretching penalty, thus leading to the stability of nonlamellar structures with curing interface. Furthermore, our results also suggest that the effect of the chain architecture on the self-assembled behavior is remarkable when the rod volume fraction is low, whereas the effect is weak when the rod volume fraction is high.