Synthesis and Self-assembly of a Triarm Star-shaped Rod-Rod Block Copolymer

被引:18
作者
Zhou, Feng [1 ]
Zhou, Qing-han [1 ,2 ]
Tian, Hai-jian [1 ]
Li, Chang-sheng [1 ]
Zhang, Yu-dong [1 ]
Fan, Xing-he [1 ]
Shen, Zhi-hao [1 ]
机构
[1] Peking Univ, Coll Chem & Mol Engn, Minist Educ, Beijing Natl Lab Mol Sci,Key Lab Polymer Chem & P, Beijing 100871, Peoples R China
[2] Southwest Univ Nationalities, Coll Chem & Environm Protect, Chengdu 610041, Peoples R China
基金
中国国家自然科学基金;
关键词
Star polymer; Liquid crystalline polymer; Block copolymer; Self-assembly; LIQUID-CRYSTALLINE POLYMERS; TRANSFER RADICAL POLYMERIZATION; LIVING ANIONIC-POLYMERIZATION; BENZYL-L-GLUTAMATE; DIBLOCK COPOLYMER; POLY(ETHYLENE OXIDE); TRIBLOCK COPOLYMERS; MOLECULAR-WEIGHT; COIL; BEHAVIOR;
D O I
10.1007/s10118-015-1621-3
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We designed and synthesized a triarm star-shaped rod-rod block copolymer (BCP), (poly{2,5-bis[(4-methoxyphenyl)-oxycarbonyl] styrene}-block-poly(gamma-benzyl-(L)-glutamate))(3), (PMPCS-b-PBLG)(3). The triarm core with three PMPCS-N-3 segments was prepared by copper-mediated atom transfer radical polymerization of 2,5-bis[(4-methoxyphenyl)-oxycarbonyl] styrene initiated by a trifunctional initiator and a subsequent azide reaction. And the PBLG block with alkyne functionality was synthesized through ring-opening polymerization of gamma-benzyl-(L)-glutamate N-carboxyanhydride initiated by propargylamine. Finally, Huisgen's 1,3-dipolar cycloaddition was employed to combine the triarm (PMPCS-N-3)(3) and PBLG segments. The chemical structure of the BCP was confirmed by H-1-NMR spectroscopy, Fourier-transform infrared spectroscopy, and gel permeation chromatographic analysis. Results from differential scanning calorimetry, polarized light microscopy, one-dimensional and two-dimensional wide-angle X-ray diffraction, and transmission electron microscopy techniques demonstrate that the triarm star-shaped rod-rod BCP self-assembles into a hexagon-in-lamella morphology, with the PMPCS block in the columnar nematic phase and the PBLG block in the hexagonal columnar arrangement packed in bilayers due to the rigid nature of the two blocks and the covalent connections in the star-shaped BCP.
引用
收藏
页码:709 / 720
页数:12
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