The 19F n.m.r, spin-lattice relaxation times in both the laboratory and the rotating frame have been measured in a 70/30mo1% 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.
Посилання на статтю:
High pressure effect on molecular motions in the paraelectric phase of a vinylidene fluoride and trifluoroethylene copolymer (70/30) studied by n.m.r. / Myriam Stock-Schweyer*, Bernard Meurer and Gilbert Weill // Polymer. – 1994. – Vol 35. – P. 2072-2077.