Abstract
The dielectric constant and the refractive index of several poly(methylphenylsiloxane) fractions (1.17×105≤M̅w≤4.56×105) with well known tacticity and two copolymers of (dimethylsiloxane–methylphenylsiloxane) (4,200≤M̅n≤6,400) were measured in cyclohexane solution, and in the case of the copolymers also in the bulk state. The copolymer compositions calculated by V-UV spectrometry were 54.3% and 9.5%, in (methylphenyl)siloxane content. A rotational isomeric state model was used to calculate the dipole moment ratio of the homopolymer. The theoretical value is in good agreement with the experimental one. A comparison of our results with those corresponding to other substituted polysiloxanes shows a very small variation of the dipole moment ratio with the nature of the substituent. The smaller values obtained for the dipole moment ratio of the copolymers in comparison with that of the homopolymer, could be attributed to the short chain length of the copolymers.
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Salom, C., Freire, J. & Hernández-Fuentes, I. Dipole Moment of Poly(methylphenylsiloxane) and Copolymers. Polym J 20, 1109–1115 (1988). https://doi.org/10.1295/polymj.20.1109
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DOI: https://doi.org/10.1295/polymj.20.1109