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Polyimide thermal breakdown

A combination of gas chromatography and either electron-impact or chemical ionization mass spectrometry has been used to analyse the products of thermal degradation of poly(vinyl fluoride) and of a number of other polymers [poly(vinyl chloride), aromatic polyimides, polyurethane]. The degradation of poly(vinyl-idene fluoride) has been related to its crystalline form. It is claimed that dehydrofluorination may take place preferentially in crystalline segments containing trans sequences. Thermo-oxidative breakdown is modified if vinylidene fluoride is copolymerized with tetrafluoroethylene or hexafluoroacetone. Dehydrofluorination occurred in both copolymers, but in the latter it was preceded by cleavage of the H from the CHj group in the alpha position to the ether bond followed by scission of the C-0 bond. ... [Pg.312]

See other pages where Polyimide thermal breakdown is mentioned: [Pg.119]    [Pg.124]    [Pg.183]    [Pg.310]    [Pg.97]    [Pg.81]    [Pg.5219]    [Pg.103]    [Pg.6207]    [Pg.6208]    [Pg.15]    [Pg.167]   
See also in sourсe #XX -- [ Pg.119 ]



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Thermal breakdown

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