Investigation of intermolecular interactions in aqueous solutions of polymers and surfactants

Abstract

Polarized luminescence was used to investigate the influence of alkyl radicals of varying length on the intramolecular mobility (IMM) of the molecules of vinylpyrrolidone-vinylamine (VPVNH 2) copolymers of 90−10% composition. Alkyl radicals were attached by covalent bonding through amino groups of the copolymer. A study was also made of changes in the IMM of the macromolecules of VPVNHR copolymers (R = C η H 2 η+1 , where η = 0, 4, 8, 12, 16) in aqueous solutions on interacting with molecules of alkyl sulphates (AS) C m H 2 m +1 OSO 3Na, where m = 8, 10, 12, 14, 16 for different ratios of the interacting molecules (in moles of the monomer unit) β ≡ [ AS]//[ BNHR]. It was found that the number of intermolecular contacts increases on varying β from 0 to 1 (2) and that the number decreases on further increasing the amount of alkyl sulphates in solution. In the light of experimental results on the linking of acrylidine orange molecules to the VP-VNHR+AS system it was found that mainly interaction of alkyl radicals takes place in the interval β = 0–0·3.