Add time:09/06/2019         Source:sciencedirect.com

The radical copolymerization of ortho-methacryloyloxybenzoic acid with methyl methacrylate and vinyl chloride has been studied at low conversions. The reactivity ratios of these comonomeric pairs have been determined by the application of Fineman-Ross and Kelen-Tüdös methods. The values obtained indicate that both systems copolymerize at random. The copolymerization with methyl methacrylate is nearly ideal, but with vinyl chloride it deviates significantly from ideal behaviour, the growing radicals being much more reactive towards ortho-methacryloyloxybenzoic acid than towards vinyl chloride. Therefore, small amounts of the acrylic monomer drastically modify the microstructure of poly(vinyl chloride) chains. The microstructure of copolymers is analysed statistically and the thermal behaviour is studied by thermogravimetric analysis, taking into account the distribution of monomers along the copolymer chains.

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