The partial ozonolysis of three random butadiene/acrylonitrile copolymers I-III, with butadiene contents of 78, 67 and 55 mol%, respectively, has been performed in order to form low-molecular-weight products by cleavage of double bonds along the main chain. The fragments thus obtained have been directly analysed by both positive and negative fast atom bombardment mass spectrometry (f.a.b.-m.s.). According to a random distribution of butadiene (Bt) and acrylonitrile (AN) subunits in the copolymer chains, peaks due to fragments with different Bt/AN ratio in the molecule have been detected in the mass spectra. The relative abundances of the species having the same total number of AN and Bt subunits, detected in the mass spectra of ozonolysed copolymers I-III, have been compared with those calculated according to a theoretical combination of AN and Bt units. Good agreement has been found between the two sets of data. A graphical procedure for rapid determination of Bt/AN copolymer composition by f.a.b.-m.s, data has been also developed
Посилання на статтю:
Structural characterization of butadiene/acrylonitrile copolymers by fast atom bombardment mass spectrometric analysis of the partial ozonolysis products / Daniele Vitalini and Emilio Scamporrino // Polymer. – 1992. – Vol 33. – P. 4597-4604.
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