Photoactivated cationic ring-opening frontal polymerizations of oxetanes

Crivello J., Bulut U.

DESIGNED MONOMERS AND POLYMERS, cilt.8, sa.6, ss.517-531, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 8 Sayı: 6
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1163/156855505774597803
  • Dergi Adı: DESIGNED MONOMERS AND POLYMERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.517-531
  • Anahtar Kelimeler: photopolymerization, cationic polymerization, frontal polymerization, oxetane monomers, epoxide monomers, PHOTOPOLYMERIZATION
  • Acıbadem Mehmet Ali Aydınlar Üniversitesi Adresli: Hayır

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.