Abstract
The thermal decomposition of the polyethylene-vinyl acetate graft copolymers was studied by thermogravimetry (nonisothermal conditions, constant heating rate of 4‡/min). Between 275 and 350‡ the thermal decomposition is due to the splitting of the acetoxy groups of the grafted chains and the elimination of acetic acid. The reaction order, activation energy and frequency factor were computed by means of the Coats-Redfern and Fuoss methods. The activation energy and frequency factor valuesobtained with the two methods agree well and they do not depend on the grafted vinyl acetate content (2.6–17.6%).
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