In the reaction of phenyl glycidyl ether with aliphatic alcohols in the presence of benzyl dimethylamine, four different oligomers are found at temperatures above 100°C. In the temperature range of 100-180°C, the length of oligomer chains decreases with increasing temperature. In bifunctional epoxide-alcohol systems the number of branched products increases simultaneously. These small branched oligomers are terminated by non-reactive end groups, preventing network formation above 140°C. At lower temperatures (< 60°C), the proportion of the addition mechanism exceeds 90%, alternating with a combined mechanism including the homopolymerization of glycidyl ether at 100°C. This mechanism yields the fastest gel times in corresponding bifunctional epoxide-alcohol systems. Above 100°C, gel times decrease again owing to hindered crosslinking in an oligomeric system with short, branched and non-reactive products
Посилання на статтю:
Reaction of glycidyl ethers with aliphatic alcohols in the presence of benzyl dimethylamine / Wolfram Tiinzer*, Steffi Reinhardt and Manfred Fedtke // Polymer. – 1993. – Vol 34. – P. 3520-3525.