Issue 11, 2012

Dual-responsive crown ether-based supramolecular chain extended polymers

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

Supplementary files

Article information

Article type
Paper
Submitted
09 May 2012
Accepted
09 Jul 2012
First published
10 Jul 2012

Polym. Chem., 2012,3, 3175-3179

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements