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Issue 11, 2012
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Dual-responsive crown ether-based supramolecular chain extended polymers

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Abstract

Based on the benzo-21-crown-7 (B21C7)/secondary ammonium salt molecular recognition motif, dual-responsive supramolecular chain extended polymers with a biodegradable poly(ε-caprolactone) (PCL) chain as the scaffold were successfully prepared by self-assembly of a heteroditopic macromonomer which was synthesized by a combination of ring-opening polymerization and click reaction. 1H NMR spectroscopy, FT-IR, solution viscometry, diffusion NMR and differential scanning calorimetry were employed to characterize these novel supramolecular chain extended polymers. Due to the environmental responsiveness of the recognition of the B21C7 host unit to the secondary ammonium salt guest moiety, the supramolecular chain extended polymers respond to pH and cation stimuli. The crystallization behavior of the PCL segments of the supramolecular chain extended polymers and the neutral counterpart were investigated by polarized optical microscopy. The B21C7/secondary ammonium salt host–guest interactions cause a decrease of the chain mobility of PCL and make the crystallization rate of PCL much slower in comparison with the case of the neutral counterpart.

Graphical abstract: Dual-responsive crown ether-based supramolecular chain extended polymers

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Supplementary files

Article information


Submitted
09 May 2012
Accepted
09 Jul 2012
First published
10 Jul 2012

Polym. Chem., 2012,3, 3175-3179
Article type
Paper

Dual-responsive crown ether-based supramolecular chain extended polymers

J. Chen, X. Yan, X. Chi, X. Wu, M. Zhang, C. Han, B. Hu, Y. Yu and F. Huang, Polym. Chem., 2012, 3, 3175
DOI: 10.1039/C2PY20323E

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