Nuclear relaxation time images by radiofrequency field gradients applied to the study of solvent permeation into polymeric materials.
T(2) images are obtained by two interleaved B(1)-gradient imaging experiments preceded by CPMG trains of different lengths. The method is assessed by means of a phantom involving compartments of different, though relatively close, T(2) values. T(1) images arise from a previously published procedure also based on two interleaved B(1)-gradient imaging experiments involving different evolution of the longitudinal magnetization. Both types of image appear to be useful in view of the structural characterization of polymer samples through the T(2) and T(1) distribution of a solvent embedded in the material.
Malveau
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Laboratoire de Méthodologie RMN, UPRESA CNRS 7042, FR CNRS 1742 (INCM), Université H. Poincaré, BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France.
Grandclaude
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Canet
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