A new approach for measuring the rate of pyrolysis of cross-linked polymers : Evaluation of degradation rate constants for cross-linked PMMA

摘要: Abstract Low molecular weight samples of PMMA have previously been observed to degrade at 400 °C via scission-initiated chain unzip in which the majority molecules depropagate end and are effectively terminated this way. It was considered by authors that if a cross-link were present within molecule may be halted overall rate degradation sample thereby reduced. In work, cross-linked low prepared free radical polymerisation using azo-bis-isobutyronitrile as an initiator, carbon tetrachloride transfer agent ethylene glycol dimethacrylate cross-linking agent. The evolution MMA monomer from these polymers has measured compared with equivalent without all situ on filament subsequently used for pyrolysis. This novel approach not yet reported, is ideal studying kinetics intractable material. found does inhibit °C. An explanation attributed units impeding unzipping reaction.