INTERACTION OF VINYL-CHLORIDE MALEIC-ANHY DRIDE COPOLYMER WITH SODIUM-AZIDE IN DIMETHYLFORMAMIDE

Interaction of sodium azide with vinyl chloride-maleic anhydride copol ymer in DMFA has been studied. The copolymer rapidly interacts with so dium azide in a tautomeric form (dienol, a 2,5-dihydroxy derivative of furan), rather than in the anhydride form, which results in the forma tion of complexes with charge transfer. It is suggested that the react ion is controlled by rehybridization of carbon atoms of succinic anhyd ride rings from tetrahedral into trigonal form, whereby the anhydride rings transform into the furan rings due to a pronounced conformationa l effect. Using the method of quasi-steady-state concentrations, an eq uation is derived that allows one to calculate the content of dienol d erivatives at various reaction temperatures and initial copolymer conc entrations, and the apparent equilibrium constants of both cyclic anhy dride and dienol.