The absolute depolarized intensity R VH for linear and 12-arm star polyisoprene (PI) for a number of molecular weights and concentrations in CCl 4 has been obtained from the depolarized Rayleigh spectra recorded with a plane Fabry-Perot interferometer. The effective optical anisotropy <γ 2>/x(=10.4±0.8 angstrom 6) per monomer unit is virtually independent of concentration and molecular weight and is comparable to be optical anisotropy β 2 of the monomer unit calculated from the molecular geometry and bond anisotropies. The weak internal orientation correlations are consistent with a strain-birefringence data and rotational isomeric state model calculations for linear PI. Core effects are very weak for the 12-arm star PI considered here.
|Original language||English (US)|
|Number of pages||3|
|Journal||Polymer communications Guildford|
|State||Published - Nov 1988|
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