Photoactivated cationic ring-opening frontal polymerizations of oxetanes
DESIGNED MONOMERS AND POLYMERS, cilt.8, sa.6, ss.517-531, 2005 (SCI-Expanded, Scopus)
- 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.