Anisotropy of the molecular motion of di-2-ethylhexyl sebacate in oriented samples of plasticized polyvinyl chloride

Abstract

The uniaxial stretching of samples of PVC plasticized by di-2-ethylhexyl sebacate retards the molecular mobility of the plasticizer inducing its anisotropy. This leads to complication of the form of the decay of transverse nuclear magnetizability, increase in the rate of relaxation of the slowly decaying component T2a -1 (λ, θ′) and the appearance of a dependence on the angle θ′ between the axis of stretching and the vector of the constant magnetic field H0. The second moment of part of the dipole-dipole interaction averaged by the rotation of the molecule about the axis perpendicular to the main one with increase in λ changes the character of the dependence on θ′ to the opposite. © 1991.