Depolarized Rayleigh spectroscopy of polystyrene near the glass–rubber relaxation
- 15 January 1979
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 70 (2), 643-645
- https://doi.org/10.1063/1.437544
Abstract
Depolarized Rayleigh scattering in polystyrene near the glass–rubber relaxation is studied using photoncorrelation spectroscopy. The observed correlation functions cannot be fit to a single exponential decay, but the empirical form C H (t)−1=δ+A exp[−2 (t/τ)β] describes the results very well. Average relaxation times 〈τ〉= (τ/β) Γ (1/β) are determined from 100 to 130°C. The apparent activation energy for the change of 〈τ〉 with temperature is over 80 kcal/mole. Depolarized Rayleigh spectroscopy should prove to be a very useful tool in the study of relaxation behavior in polymers.Keywords
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