NMR-STUDY OF PLASTICIZED PVC

Samples of PVC plasticized by di-isobutylphthaiate and di-2-ethylhexyl phthalate, with plasticizer content varying up to 180 parts per hundre d, have been examined using solid-state H-1- and C-13-NMR. Proton spin -lattice relaxation times in both the laboratory and the rotating fram es were measured, with analysis into multi-exponential components wher e necessary. Crosspolarisation magic-angle spinning C-13 spectra have also been obtained, including variation with contact time. The data ar e discussed in terms of the domain structure of the samples at the mic roscopic level and of the role of the plasticizer.