Abstract
Thermal degradation of cellulose acetate hydrogen phthalate (CAP) and its blends with poly methyl methacrylate (PMMA) has been investigated by thermogravimetric analysis. TG/DTG curves show two decomposition stages for pure CAP. Decomposition behaviour is changed with addition of PMMA. For 90/10 CAP/PMMA and 70/30 CAP/PMMA blends, there are three decomposition stages. With further addition of PMMA, the decomposition behaviour shifts towards that of pure PMMA. For 50/50 CAP/PMMA, 30/70 CAP/PMMA, 10/90 CAP/PMMA and pure PMMA, only one decomposition stage is seen. The temperature at which 50% decomposition takes place, T 50 is found to increase with increased PMMA content. Chemical changes involved in different decomposition stages are discussed. The effect of blend composition on the amount of residue remaining at various temperatures has been studied. Activation energies of degradation have been calculated using Coats–Redfern and Horowitz–Metzger equations. Attempts have been made to correlate the thermal stability to the compatibility of the blends.
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