Reversible cross-linking reactions of alkoxyamine-appended polymers under bulk conditions for transition between flow and rubber-like states

Jing Su, Yoshifumi Amamoto, Tomoya Sato, Masashi Kume, Taro Inada, Tomoyuki Ohishi, Yuji Higaki, Atsushi Takahara, Hideyuki Otsuka

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Reversible cross-linking reactions of alkoxyamine-appended polymers with low glass transition temperature (Tg) were successfully carried out under bulk conditions. The low-Tg polymers with alkoxyamine units in the side chains were synthesised by radical copolymerisation of 2-ethylhexyl acrylate and two kinds of alkoxyamine-containing acrylate monomers. By heating the low-Tg polymers under bulk conditions at 100 C, cross-linked polymers were formed by radical exchange reactions between alkoxyamine units, and a transition from a liquid-like flowable polymer state to a rubber-like polymer state was confirmed. A de-cross-linking reaction was also accomplished by radical exchange reactions between the cross-linked polymers and an added alkoxyamine-containing small molecule or stable nitroxyl radical, which resulted in transition to the flowable state again. The structural transition between low-Tg linear polymers and cross-linked polymers were characterised by 1H and 13C NMR spectroscopy, Fourier transform infrared spectroscopy, rheology measurement, swelling experiment, and gel permeation chromatography measurement.

Original languageEnglish
Pages (from-to)1474-1480
Number of pages7
Journalpolymer
Volume55
Issue number6
DOIs
Publication statusPublished - Mar 24 2014

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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