| Abstract
| - Eleven samples of poly{n-hexyl-[(S)-3-methylpentyl]silylene} (PH3MPS) ranging in weight-average molecular weight Mw from 3.1 × 103 to 8.7 × 105 in isooctane have been studied by light scatteringat 25 °C, sedimentation equilibrium at 25 °C, and viscometry at five temperatures (−27,−15, 5, 25, and45 °C) to determine their z-average radii of gyration 〈S2〉z, second virial coefficients, and intrinsic viscosities[η]. The 〈S2〉z and [η] data are analyzed quantitatively by the current theories on the basis of the wormlikechain with excluded volume over the entire range of Mw studied. PH3MPS is shown to be a typicalsemiflexible polymer with the persistence length changing from 15.4 to 5.0 nm at −27 to 45 °C. Theviscometry has also been made on a PH3MPS sample in n-hexane and methylcyclohexane at 25 °C. Inthese solvents, the global conformation of PH3MPS is essentially the same as that in isooctane at thesame temperature.
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