Eleven samples of poly{ n -hexyl-[( S )-3-methylpentyl]silylene} (PH3MPS) ranging in weight-average molecular weight M w from 3.1 × 10 3 to 8.7 × 10 5 in isooctane have been studied by light scattering at 25 °C, sedimentation equilibrium at 25 °C, and viscometry at five temperatures (−27,−15, 5, 25, and 45 °C) to determine their z -average radii of gyration 〈 S 2 〉 z, second virial coefficients, and intrinsic viscosities [ η ]. The 〈 S 2 〉 z and [ η ] data are analyzed quantitatively by the current theories on the basis of the wormlike chain with excluded volume over the entire range of M w studied. PH3MPS is shown to be a typical semiflexible polymer with the persistence length changing from 15.4 to 5.0 nm at −27 to 45 °C. The viscometry has also been made on a PH3MPS sample in n -hexane and methylcyclohexane at 25 °C. In these solvents, the global conformation of PH3MPS is essentially the same as that in isooctane at the same temperature.
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Terao et al. (2001) studied this question.