Determination of the molecular-weights and the molecular-weight distributions of a semicrystalline poly(aryletherketone-co-sulfone) (htx) by a chemical derivatization method .1. molecular characterization of htx solved in concentrated sulfuric-acid
Macromolecular chemistry and physics vol:195 issue:1 pages:329-345
HTX, a poly(aryletherketone-co-sulfone), is characterized in solution in concentrated sulfuric acid. Upon dissolution in concentrated H2SO4, HTX is chemically modified by sulfonation of phenyl rings. The modification of the chemical structure is studied with a model compound by means of IR spectroscopy. The increase of the molar mass corresponding to a complete sulfonation is determined by means of mass spectrometry. Light scattering and F-19 NMR measurements are performed in order to obtain the weight- (M(w)BAR)s and number-average (M(n)BAR)s molar masses of sulfonated HTX samples. (M(w)BAR)s values allow the determination of the Mark-Houwink-Sakurada relationship for HTX in 99,5% H2SO4 at 25-degrees-C.