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High-resolution solid-state 13C, 29Si, and 1H NMR spectra of silicone rubber have been measured using the magic-angle spinning of the sample. The spectra of the three nuclei split into two or three components in the range of the spinning rate between 1.4 and 2.0 kHz. Below 1.4 kHz and above 2.0 kHz, the spectra consist of only one component. Stress caused by the fast spinning is considered to cause conformational changes in the polydimethylsiloxane chains.
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Hayashi et al. (1991) studied this question.
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