Synthesis of polymers containing pseudohalide groups by cationic polymerization, 2. Copolymerization of 3,3‐bis(azidomethyl)oxetane with substituted oxetanes containing azide groups

The cationic copolymerization of 3,3‐bis(azidomethyl)oxetane (BAMO) was studied, initiated by a mixture of boron trifluoride diethyl etherate/diethylene glycol (2,2′‐oxydiethanol). The copolymerization of BAMO with 3‐azidomethyl‐3‐(2,5‐dioxaheptyl)oxetane (AMDHO) and 3‐azidomethyl‐3‐(2,5,8‐trioxadecyl)oxetane (AMTDO) was investigated in order to obtain at the same time a decrease of the crystallization tendency and of the glass transition temperature of poly(BAMO). The interest in this copolymerization is linked with the fact that, when BAMO was copolymerized with 15 wt.‐% of AMTDO, it was possible to obtain bifunctional oligomers with a glass transition temperature in the −50 to −60°C range, without significant loss in the nitrogen content.