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Isolation and cationic ring-opening polymerization of 2,3,5,6-tetrahydroimidazo[2,1-b][1,3]oxazole to produce a thermally stable polyurea

✍ Scribed by Masatoshi Miyamoto; Toshio Watanabe; Yoshiharu Kimura

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 253 KB
Volume: 18
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1997.030181001

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✦ Synopsis

Abstract

A bicyclic pseudourea, 2,3,5,6‐tetrahydroimidazo[2,1‐b][1,3]oxazole (1), was isolated for the first time, and its cationic and spontaneous polymerizations were examined. Both polymerizations gave poly(1,3‐imidazolidin‐2‐one‐1,3‐diylethylene) (2) in high yields. The polymer is a crystalline solid with glass transition and melting temperature of 51°C and 286°C, respectively. Thermogravimetry showed that it is stable up to 450°C under nitrogen.

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