Thermal degradation of poly(o-methacryloyloxybenzoic acid)

Add time:09/05/2019    Source:sciencedirect.com

The thermal behaviour of poly(o-methacryloyloxybenzoic acid) has been studied by means of dynamic and isothermal thermogravimetric analysis in the range 100–600°C, and infra-red spectroscopy. The results suggest that the initial step in the degradation of the polymer in the range 140–220°C involves the release of salicylic acid from isotactic sequences and the formation of sixmembered cyclic structures of the glutaric anhydride type. This process results in the formation of a random copolymer of o-methacryloyloxybenzoic acid and 2-methylene-2,4-dimethylglutaric anhydride. Subsequent heating in the range 220–330°C results in loss of the remaining salicylic groups to form the pure polyanhydride compound. Degradation of the main chain occurs at temperatures above 330°C.

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