The H2-NMR technique is used to monitor the orientational behaviour of short, deuterated polydimethylsiloxane (PDMS) chains dissolved in an unlabelled silicone rubber matrix. When the host matrix is uniaxially stretched, an orientational order is induced at the segmental level of the PDMS probe chain ( M , = 10.500). This stress-induced orientation of the probe chain demonstrates that short-range orientational correlations take place in the deformed network. A comparison with previous results obtained on cross-linked chains suggests that these interchain effects may be the dominant contribution to the segmental orientation of the effectively elastic chains.
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