High pressure effect on molecular motions in the paraelectric phase of a vinylidene fluoride and trifluoroethylene copolymer (7030) studied by n.m.r.

Abstract The 19 F n.m.r. spin-lattice relaxation times in both the laboratory and the rotating frame have been measured in a 70 30 mol % random copolymer of vinylidene fluoride and trifluoroethylene, over a range of pressures from 0.1 to 200 MPa in the paraelectric phase. Molecular motions have been investigated in this condis phase, and correlation times were obtained as a function of pressure and temperature. Activation parameters have been determined and discussed in terms of a thermally activated model and compared with literature data.