Behaviour of diphilic copolymers in solution: case of p-tert-butyl phenyl methacrylatevinyl pyrrolidone

Properties of dilute solutions of vinyl pyrrolidone-p-tert-butyl phenyl methacrylate in binary solvents have been investigated through viscosity measurements. A diphilic characteristic for these copolymers of various compositions in two binary solvents, (a) benzene/methanol (a cross-selective solvent) and (b) benzene/chloroform (with a common solvent chloroform) is reported. We also report data obtained for homopolymers in the same binary solvents. Eskin and Korotkine's equations have been applied to these systems. Unusual behaviour, found in benzene/methanol, is discussed.