Hydrogen Bond Induces Hierarchical Self-Assembly in Liquid-Crystalline Block Copolymers
Hydrogen Bond Induces Hierarchical Self-Assembly in Liquid-Crystalline Block Copolymers
复制标题
氢键诱导液晶嵌段共聚物中的多级自组装
DOI：
10.1002/marc.201700783
复制
发表时间：
2018-03-01
影响因子：
4.6
通讯作者：
Yu, Haifeng
中科院分区：
文献类型：
--
作者：
Huang, Shuai;Pang, Linlin;Yu, Haifeng
以小分子为功能添加剂，通过氢键诱导嵌段共聚物(BCS)的自组装，可以得到尺寸小于10 nm的嵌段共聚物的微相分离结构。本文报道了两亲液晶BCS(LCBCs)在存在氢键但没有任何掺杂的情况下，通过微相分离的方法制备出分层自组装的亚10 nm结构。LCBCs疏水嵌段侧链上新引入的氨基甲酸酯基团与亲水性聚氧乙烯(PEO)嵌段的醚基相互作用，导致PEO嵌段结晶不完全。晶态和非晶态结构域同时存在于分离的PEO相中，使得PEO纳米柱状物内部出现层状结构。这提供了一种巧妙的方法，可以在定义良好的聚合物体系中制备可控的亚10 nm微结构，而不需要引入任何掺杂剂。
Microphase-separated structures of block copolymers (BCs) with a size of sub-10 nm are usually obtained by hydrogen-bond-induced self-assembly of BCs through doping with small molecules as functional additives. Here, fabrication of hierarchically self-assembled sub-10 nm structures upon microphase separation of amphiphilic liquid-crystalline BCs (LCBCs) at the existence of hydrogen bonds but without any dopants is reported. The newly introduced urethane groups in the side chain of the hydrophobic block of LCBCs interact with the ether groups of the hydrophilic poly(ethylene oxide) (PEO) block, leading to imperfect crystallization of the PEO blocks. Both crystalline and amorphous domains coexist in the separated PEO phase, enabling a lamellar structure to appear inside the PEO nanocylinders. This provides an elegant method to fabricate controllable sub-10 nm microstructures in well-defined polymer systems without the introduction of any dopants.