Thermal decomposition of copolymers from ethylene with some vinyl derivatives |
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Authors: | M. Dolores Fernández M. Jesús Fernández |
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Affiliation: | (1) Departamento de Ciencia y Tecnología de Polímeros, Facultad de Química, Universidad del País Vasco, P.O. Box 1072, 20080 San Sebastián, Spain |
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Abstract: | The thermal degradation of ethylene-vinyl acetate (EVA), ethylene-vinyl-3,5-dinitrobenzoate (EVDNB) and ethylene-vinyl alcohol (EVAL) copolymers have been studied using differential thermal analysis (DTA) and thermogravimetry (TG) under isothermal and dynamic conditions in nitrogen. Thermal analysis indicates that EVA copolymers are thermally more stable than EVDNB samples. The degradation of the copolymers considered occurs as an additive degradation of each component polyethylene (PE) and poly(vinyl acetate) (PVA), poly(vinyl-3,5-dinitrobenzoate) (PVDNB) or poly(vinyl alcohol) (PVAL). The apparent activation energy of the decomposition was determined by the Kissinger and Flynn-Wall methods which agree well. |
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Keywords: | activation energy ethylene-vinyl acetate copolymers ethylene-vinyl alcohol copolymers ethylene-vinyl-3,5-dinitrobenzoate copolymers thermal degradation |
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