Abstract
Solutions of poly(dimethylsiloxane) in benzene have been studied by the analysis of NMR spectra. It was found that they are characterized by the narrow-broad lines previously obtained for pure liquid poly(dimethylsiloxane). The width and the second moment of the absorption bands for the methyl group and for benzene varied almost in the same manner with decreasing volume fraction of poly(dimethylsiloxane) and showed a strong dependence on volume fraction of poly(dimethylsiloxane) in highly concentrated solution above the critical entanglement point of the chains. These trends suggest that the correlation time for the nuclear magnetic interaction of benzene as well as for the methyl group are governed by the segmental motion and the drift motion of the poly(dimethylsiloxane) molecules as a whole. In the highly concentrated solution, a sharp peak due to the increase of the isolated benzene molecules superposes on the so-called narrow-broad line, which is attributed to the benzene molecules interacting with the poly(dimethylsiloxane) molecules. Thus the ratio of ΔH1/2 to 2\\sqrt{〈ΔH22〉} for benzene decreases.
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Muramoto, A. Study of Solutions of Poly(dimethylsiloxane) in Benzene by NMR. Polym J 6, 480–488 (1974). https://doi.org/10.1295/polymj.6.480
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DOI: https://doi.org/10.1295/polymj.6.480