Synthesis and self-assembly of a triarm star-shaped rod-rod block copolymer
Synthesis and self-assembly of a triarm star-shaped rod-rod block copolymer
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DOI：
10.1007/s10118-015-1621-3
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发表时间：
2015-03
影响因子：
4.3
通讯作者：
Feng Zhou;Qingmei Zhou;Hai-jian Tian;Chang-sheng Li;Yu-dong Zhang;Xinghe Fan;Zhihao Shen
中科院分区：
文献类型：
--
作者：
Feng Zhou;Qingmei Zhou;Hai-jian Tian;Chang-sheng Li;Yu-dong Zhang;Xinghe Fan;Zhihao Shen
We designed and synthesized a triarm star-shaped rod-rod block copolymer (BCP), (poly{2,5-bis[(4-methoxyphenyl)-oxycarbonyl]styrene}-block-poly(γ-benzyl-l-glutamate))3, (PMPCS-b-PBLG)3. The triarm core with three PMPCS-N3segments 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 ofγ-benzyl-l-glutamateN-carboxyanhydride initiated by propargylamine. Finally, Huisgen’s 1,3-dipolar cycloaddition was employed to combine the triarm (PMPCS-N3)3and PBLG segments. The chemical structure of the BCP was confirmed by1H-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.
