NMR-STUDIES OF PVC MOLECULAR MOBILITY

The molecular mobility of a polymer in the solid state can be determin ed by NMR relaxation measurements. The analysis of proton spin-lattice relaxation time (T1H) and proton spin-lattice relaxation time in the rotating frame (T(1)H(r)ho), allow information to be obtained about th e behaviour of homogeneous samples. The response of this behaviour can be extracted by NMR solid state techniques such as: magic-angle spinn ing (MAS) variable contact time, inversion-recovery, spin-locking, del ayed contact time and cross polarization-MAS.