A novel pH-responsive supramolecular polymer constructed by pillar[5]arene-based host-guest interactions

  • Xia B
  • Zheng B
  • Han C
 et al. 
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A novel pH-responsive supramol. polymer based on the pillar[5]arene/imidazolium cation recognition motif was successfully prepd. It was demonstrated that the binding strength between the monomer mols. in soln. could be reduced by adding base, thereby leading to a decrease in the polymn. degree, while a reverse switch could be achieved by the addn. of acid to change the monomer back to the cationic state. These processes were confirmed by 1H NMR, DOSY expts., viscosity measurements and theor. calcns. Moreover, a rod-like fiber was drawn from a high concn. soln. of the monomer and characterized by SEM, providing direct evidence of the formation of a supramol. polymer with high mol. wt. and high degree of the linear chain extension. In this study, a reversible transition between the high-mol.-wt. supramol. polymer and the relatively low-mol.-wt. one, i.e., a control of the polymn. degree, was realized by simply altering the soln. pH. These results are helpful for the future fabrication of adaptive and smart supramol. materials with stimuli-responsiveness and special functions. [on SciFinder(R)]

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  • Binyuan Xia

  • Bo Zheng

  • Chengyou Han

  • Shengyi Dong

  • Mingming Zhang

  • Bingjie Hu

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