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SynopsisInfrared spectroscopic and DTA measurements and chemical analysis have shown that during stabilization of PVC with organic and inorganic basic lead salts various reactions occur: (a) binding of the evolved HC1 by these salts with the formation of lead chloride and complexes, including HCl, which catalyze the PVC degradation; (b) complex-forming reaction with the reactive PVC groups, which decreases the intensity of color of the polymer. I n addition, with weak-organic-acid basic lead salts, exchange of labile C1 atoms for acid residues in PVC occurs, which results in an increase in inherent polymer stability.

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