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Polarized Raman scattering of concentrated solutions of poly(dimethyl siloxane) in benzene (1977)

Thornley, P. W. ; Shepherd, I. W.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1339-1345

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ISSN: 0098-1273

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Raman depolarization (ρ) measurements have been made over the temperature range 20 〉 T 〉 60°C for solutions of poly(dimethyl siloxane) (mol wt 7.7 × 104 and 2.0 × 104) for several concentrations up to 100%. The band studied was the highly polarized methyl stretch at 2907 cm-1. Computer calculations of the probability pt of a rotational isomer being trans allow the ρ values to be related to ΔG, the free energy of mixing. ΔG is plotted as a function of concentration and minima are observed at 60 ± 3% (mol wt = 7.7 × 104) and 70 ± 3% (mol wt = 2 × 104).

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1977.180150803

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