PH-Controllable cyclic threading/dethreading of polypseudorotaxane obtained from cyclodextrins and poly(amino ester)

Guobin Sun, Decheng Wu, Ye Liu*, Chaobin He, Tai-Shung Chung, Suat Hong Goh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Cyclic threading/dethreading of novel polypseudorotaxane obtained from β-cyclodextrins and poly(amino ester), poly(BDA-DEEDA), obtained from the Michael addition polymerization of 1,4-butanediol diacrylate (BDA) and N, N′-diethyl ethylenediamine (DEEDA), was realized by adjusting pH of the aqueous solutions between ca. 9.0 and 3.2 alternatively. 1H NMR, XRD profiles, and 13C CP/MAS NMR verified the formation of polypseudorotaxane, and acid titration induced dethreaded structures were characterized using 2D ROESY NMR, 1H NMR and XRD. The appearance/disappearance of precipitates, the kinetics, and the cyclic performance of pH controllable threading/dethreading processes were monitored by the changes in absorbance or transmittance of the solutions as reflected by UV experiments. Further pH-induced protonated and deprotonated states of poly(BDA-DEEDA) were demonstrated by 1H NMR, which indicated the mechanism of the threading/dethreading processes.

Original languageEnglish (US)
Pages (from-to)3355-3362
Number of pages8
JournalPolymer
Volume46
Issue number10
DOIs
StatePublished - Apr 25 2005

Keywords

  • Cyclodextrins
  • Polyrotaxanes
  • Self-assembly

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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