Abstract
The monomer (2-allylphenoxy)pentachlorocyclotriphosphazene (Ia) was synthesized on reacting hexachlorocyclotriphosphazene with 2-allylphenol with a phase-transfer catalyst in a dichloromethane/alkaline solution. The copolymerizations of Ia with styrene, methyl methacrylate, and vinylbenzyl chloride were investigated. No improvement in the weight conversion of the copolymerization reaction was observed when the duration of copolymerization exceeded 30 h and the reaction temperature was controlled between 60 and 80 °C. Molecular weights of the copolymers decreased with increasing molar fraction of Ia in the feed, but there was no correlation with the content of Ia in the copolymer. Reactivity ratios and Alfrey-Price parameters for the copolymers were obtained. The copolymers were characterized by using EA, GPC, TGA, and DSC. The incorporation of the phosphazene unit affected the flame-retarding properties of the copolymer. Tensile measurement showed that the copolymer of Ia reacted with methyl methacrylate was hard and brittle.
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