ANALYSIS OF HYDRODYNAMIC DATA ON POLYMETHACRYLATES WITH MESOGENIC PENDANT GROUPS

Dilute solutions of poly{6-4-(4-methoxyphenoxycarbonyl)phenoxy!hexyl methacrylate} (1 a, structure-based IUPAC name bonyl)phenoxy!hexyloxyc arbonyl}-1-methylethylene)) were investigated by means of size-exclusi on chromatography (SEC), osmometry, light scattering, and viscometry. It was found that the universal calibration of SEC is not valid with t his polymer and that dilute solution properties (intrinsic viscosity, second virial coefficient) are at variance with predictions from the t wo-parameter theory of polymer solutions. The latter discordance is ex plained on the basis of the theory of hydrodynamic properties of worml ike chains which takes into account the effective diameter of the chai n. The characteristic ratio (C(infinity) = 15,1) and the Kuhn segment length (lambda-1 = 28 . 10(-8) cm) were estimated. The polymer-solvent interaction parameter was shown to decrease in the series of solvents : 1,1,2,2-tetrachloroethane, chloroform, tetrahydrofuran, N,N-dimethyl formamide. The interaction of the solvents with the side groups was sh own to be the determining factor.