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Effect of Dispersity on the Conformation of Spherical Polymer Brushes

机译：分散性对球面聚合物刷构象的影响

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摘要

We show that dispersity (D.) markedly alters the conformation of spherical polymer brushes. The average lengths (l(b)) of poly(tert-butyl acrylate) (PtBA) brushes of varying D. grafted to nanoparticles were measured using dynamic light scattering. In the semidilute polymer brush (SDPB) regime, the l(b) of PtBA and polymers from earlier studies of various D. could be cleanly collapsed onto a master curve as a function of the scaling variable N-w sigma(1/3), where N-w is the weight-average degree of polymerization and s is the grafting density. In the concentrated polymer brush (CPB) regime, however, l(b) collapsed onto a bifurcated curve as a function of the scaling variable N-w sigma(1/2), indicating D. more strongly affects the average length of brushes with low N-w sigma(1/2). We propose that the stretching of the stem near the particle surface due to interchain interactions in the CPB regime leads to greater l(b) in broad dispersity brushes of low but not high N-w sigma(1/2).
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  • 来源
    《ACS Macro Letters》 |2021年第5期|共7页
  • 作者

    Li Tzu-Han; Yadav Vivek; Conrad Jacinta C.; Robertson Megan L.;

  • 作者单位

    Univ Houston Mat Sci &

    Engn Program Houston TX 77204 USA;

    Univ Houston William A Brookshire Dept Chem &

    Biomol Engn Houston TX 77204 USA;

    Univ Houston William A Brookshire Dept Chem &

    Biomol Engn Houston TX 77204 USA;

    Univ Houston William A Brookshire Dept Chem &

    Biomol Engn Houston TX 77204 USA;

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  • 正文语种 eng
  • 中图分类 有机化学;
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