Thermal degradation of the polyimide synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic dianhydride and 4,4′-diaminodiphenylmethane

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Abstract

The thermal degradation of polyimide PIF2 synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic dianhydride and 4,4′-diaminodiphenylmethane was systematically and thoroughly investigated by high-resolution pyrolysis gas chromatography/mass spectrometry, thermogravimetric analysis, and Fourier transform infrared spectroscopy. The pyrolyzates of PIF2 were dependent on the pyrolysis temperature. Two weight-loss peaks were observed in the derivative thermogravimetric analysis of PIF2 and the first peak was related to the fluorine-containing segment (hexafluoroisopropylidene). The overall activation energy and preexponential factor were calculated through dynamic TGA with Ozawa's method. Based on the results, a thermal degradation mechanism of the PIF2 was proposed. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2295–2301, 2004

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