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Controlled Synthesis of Densely Grafted Bottlebrushes That Bear Helical Polyisocyanide Side Chains on Polyisocyanide Backbones and Exhibit Greatly Increased Viscosity

  • Yi-Xu Su
    Yi-Xu Su
    Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, Anhui Province, China
    More by Yi-Xu Su
  • Lei Xu
    Lei Xu
    Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, Anhui Province, China
    More by Lei Xu
  • Xun-Hui Xu
    Xun-Hui Xu
    Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, Anhui Province, China
    More by Xun-Hui Xu
  • Xiao-Hua Hou
    Xiao-Hua Hou
    Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, Anhui Province, China
    More by Xiao-Hua Hou
  • Na Liu
    Na Liu
    Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, Anhui Province, China
    More by Na Liu
  • , and 
  • Zong-Quan Wu*
    Zong-Quan Wu
    Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, Anhui Province, China
    *E-mail: [email protected]
    More by Zong-Quan Wu
Cite this: Macromolecules 2020, 53, 8, 3224–3233
Publication Date (Web):April 7, 2020
https://doi.org/10.1021/acs.macromol.9b02032
Copyright © 2020 American Chemical Society

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    Abstract

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    The precise synthesis of a new series of densely grafted bottlebrushes that bear helical polyisocyanide side chains on polyisocyanide backbones is described. New C1 polymers, polyisocyanides that bear active pentafluorophenol ester pendants, were first prepared and then installed with a Pd(II) catalyst on each backbone carbon via transesterification. All the Pd(II)-catalyst pendants could efficiently catalyze the living polymerization of isocyanide monomers, leading to the formation of densely grafted bottlebrush polymers. The grafting density could be facilely tuned through changing the content of Pd(II) pendants on the backbone. Because both the backbone and the side chain were synthesized via living chain-growth polymerizations, a variety of bottlebrush polymers and core–shell bottlebrushes with different compositions and controlled structures were prepared. The new synthetic bottlebrush polymers showed distinctively enhanced viscosity and modulus which could be further regulated via varying the grafting density.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.macromol.9b02032.

    • Synthesis procedure of bottlebrush polymers, kinetic studies, polymerization results, characterization data, FT-IR spectra, UV-Vis spectra, SEC curves, CD spectra, 1H NMR spectra, AFM images, plots of Mn and Mw/Mn values, TGA and DSC curves, and intrinsic viscosity of bottlebrush polymers (PDF)

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