Abstract
The measurement of magnetic relaxation times in polymers is discussed, with particular reference to the rotating frame method for obtaining T1ρ. The relevant theory of magnetic relaxation is introduced, such as is necessary to derive parameters relating to molecular motions and phase changes from T1 and T1ρ measurements on polymers, i.e. correlation times, τ c , and activation energies, ΔE. The various approximations involved in this theory are also mentioned as are the resulting adaptations of the theory which make it more appropriate to the interpretation of data on polymers. Experimental techniques are briefly discussed and some approximate confidence limits are given for the successful graphical decomposition of non-exponential decays of magnetisation according to a two-phase model (i.e. a polymer containing amorphous and crystalline regions).
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