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

Feng Zhou Qing-han Zhou Hai-jian Tian Chang-sheng Li Yu-dong Zhang Xing-he Fan Zhi-hao Shen

Citation:  Feng Zhou, Qing-han Zhou, Hai-jian Tian, Chang-sheng Li, Yu-dong Zhang, Xing-he Fan, Zhi-hao Shen. Synthesis and Self-assembly of a Triarm Star-shaped Rod-Rod Block Copolymer[J]. Chinese Journal of Polymer Science, 2015, 33(5): 709-720. doi: 10.1007/s10118-015-1621-3 shu

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

  • 基金项目:

    This work was financially supported by the National Natural Science Foundation of China (Nos. 20990232 and 21174006).

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(-benzyl-L-glutamate))3, (PMPCS-b-PBLG)3. The triarm core with three PMPCS-N3 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 -benzyl-L-glutamate N-carboxyanhydride initiated by propargylamine. Finally, Huisgen's 1,3-dipolar cycloaddition was employed to combine the triarm (PMPCS-N3)3 and PBLG segments. The chemical structure of the BCP was confirmed by 1H-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.

English

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  • 发布日期:  2015-05-05
  • 收稿日期:  2014-09-02
  • 修回日期:  2014-10-07
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