LOW-TEMPERATURE RADIATION POSTPOLYMERIZAT ION OF 1,3-BIS(DIMETHYLAMINO)ISOPROPYL METHACRYLATE AND STUDY OF ITS MOLECULAR-CONFORMATIONAL CHARACTERISTICS

Pecularities of kinetics of low-temperature radiation postpolymerizati on of 1,3-bis(dimethylamino)isopropyl methacrylate were studied. Depen ding on conditions of the process, polymerization can proceed through different modes: steady-state and vibrational or as a thermal explosio n. The values of MBAR(w), second virial coefficients A2, mean-square r adius of gyration of a polymer coil [R2]1/2, and intrinsic viscosity w ere determined for the samples obtained with various modes of polymeri zation. As the dose of gamma-radiation is increased molecular mass dec reases, whereas when the reaction is carried out under nonsteady-state conditions molecular mass distribution curve broadens to high molecul ar masses. From the molecular characteristics of the polymer a number of conformational parameters, such as specific unperturbed dimension K , parameter ([h0(2)]/M)1/2 characteristic of hindrance of internal rot ation, and the Kuhn segment A were calculated.