Study of the properties and conformations in solution of a styrene copolymer with maleic mono N,N-diethylaminopropylamide

Abstract

The methods of IR-spectroscopy, potentiometry, viscometry and spectrophotometry have been used to study the structure, properties and conformations in aqueous and water-salt solutions of a new synthetic polyampholyte—a styrene copolymer with the mono N,N-diethylaminopropylamide of maleic acid (I). It is shown that in the solid state I pssissinf a regular structure represents an internal salt. The state of the macromolecules of I in aqueous and water-salt solutions is analysed. It is shown that for [NaCl]⩽0·1 × 10 2 mole/m 3 in the interval 4·3<pH<9·9 the molecules of I form two types of compact structures in solution—with greater and lesser density of packing of the segments. The pH of the transition (6·0) and the number of groups involved in it are determined. The reasons for the observed influence of the salt on the polyampholyte and the factors of stabilization of the compact structures of its molecules in solution are discussed.