Segmental order in a uniaxially constrained polydimethylsiloxane network : a deuterium magnetic resonance study

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Abstract
The orientational order generated in a cross-linked rubber by a uniaxial stress is probed with deuterium NMR. Spectra of perdeuterated polymer chains of a polydimethylsiloxane model network exhibit quadrupolar doublets under both elongation and compression. Experiments for various orientations of the stress relative to the spectrometer magnetic field show that an uniaxial anisotropy is induced at the level of the chain segments. The doublet splitting has an explicit dependence on the extension ratio