ANALYSIS WITH A PYROLYSIS-GAS CHROMATOGRAPH-MASS SPECTROMETER SYSTEM POLYIMIDES

摘要

A pyrolysis-gas chromatograph-mass spectrometer system has been used to analyse the products from the pyrolysis of a polyimide and certain perfluoro-alkylene-linked polyimides in an inert atmosphere. The major primary degradation products were carbon monoxide and carbon dioxide;in addition large amounts of silicon tetrafluoride were produced, as a secondary product, by pyrolysis of the fluorine-containing materials. Thermal decomposition schemes consistent with the formation of these products are proposed.nResults obtained with model compounds suggest that perfluoroalkylene groups have a more pronounced effect on the electron-impact behaviour of the imide ring than on its thermal breakdown.