Thermogravimetric analysis of methyl methacrylate‐graft‐natural rubber

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Abstract

Abstract The thermal degradations of methyl methacrylate‐graft‐natural rubber (MG) at different heating rates ( B ) in nitrogen were studied by thermogravimetric analysis. The results indicate that the thermal degradation of MG in nitrogen is a one‐step reaction. The degradation temperatures increase along with the increment of heating rates. The temperature of initial degradation ( T 0 ) is 0.448 B + 362.4°C, the temperature at maximum degradation rate, that is, the peak temperature on a differential thermogravimetric curve ( T p ) is 0.545 B + 380.7°C, and the temperature of final degradation ( T f ) is 0.476 B + 409.4°C. The degradation rate at T p is not affected by B , and its average value is 48.9%; the degradation rate at T f is not affected by B either, and its average value is 99.3%. The reaction order ( n ) is 2.1 and is not affected by B . The reaction activation energy ( E ) and the frequency factor ( A ) increase along with B , and the apparent reaction activation energy ( E 0 ) is 254.6 kJ/mol. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2952–2955, 2002

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