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| - Biaxial Deformation of a Polymer Network Measured via DeuteronQuadrupolar Interactions
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| - Deuterium quadrupolar interactions have been used to measure chain ordering for poly(dimethylsiloxane) elastomers under planar biaxial extension. The NMR spectral splittings obtained fromtwo different deuterium-labeled probe molecules diffusing within the network were measured as a functionof extension ratio λ and the orientation of the principal axis of deformation with respect to the magneticfield. Theoretical predictions based on a phantom Gaussian chain model are compared with the data andgood agreement is found. The implications of axial asymmetry at various levels of the probe moleculemotional hierarchy are discussed. For rapidly diffusing probe molecules, only the highest level in thehierarchy influences the observed quadrupole interaction symmetry, and the true distribution of chainsegment directors is measured.
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