MOLECULAR MOBILITY OF DI-2-ETHYLHEXYL SEB ACATE IN A UNIAXIALLY ORIENTED MATRIX OF PLASTICIZED POLYVINYL-CHLORIDE

Uniaxial drawing of PVC plasticized with di-2-ethylhexyl sebacate supp resses the intensity of the molecular motion of plasticizer and makes this motion anisotropic. Orientation of effective rotation axes of the molecules of plasticizer results in incomplete averaging of intramole cular dipole-dipole interaction. This incomplete averaging accounts fo r the complex pattern of the decay of transversal nuclear magnetizatio n and gives rise to the interplay between the rate of relaxation T-2a( -1) (lambda, theta') and the angle theta' between the drawing axis and the vector of static magnetic field H-0. Orientation of effective rot ation axes of the molecules of plasticizer is almost complete at a dra w ration lambda approximate to 3.