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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
Author(s) -
Miyamoto Masatoshi,
Watanabe Toshio,
Kimura Yoshiharu
Publication year - 1997
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1997.030181001
Subject(s) - cationic polymerization , thermogravimetry , polymerization , oxazole , polymer chemistry , materials science , bicyclic molecule , polymer , ring opening polymerization , thermal stability , chemistry , stereochemistry , organic chemistry , composite material , inorganic chemistry
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.