Photoactivated cationic ring-opening frontal polymerizations of oxetanes


Crivello J., Bulut U.

DESIGNED MONOMERS AND POLYMERS, cilt.8, ss.517-531, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 8 Konu: 6
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1163/156855505774597803
  • Dergi Adı: DESIGNED MONOMERS AND POLYMERS
  • Sayfa Sayısı: ss.517-531

Özet

The photoinitiated cationic ring-opening polymerizations of 3,3-disubstituted oxetanes display a characteristic induction period followed by very rapid thermally accelerated polymerization. When a thin-film sample of such a monomer is irradiated for a time within the induction period and then allowed to stand at room temperature, no appreciable further conversion of monomer to polymer takes place. However, when heat is applied to a small portion of the films rapid polymerization takes place as a front, which propagates rapidly throughout the entire reaction mass. To characterize these frontal polymerizations, a new monitoring technique, employing optical pyrometry has been instituted. This method provides a simple, rapid means of following these polymerizations and quantitatively determining their frontal velocities.