ISSN:
0392-6737
Keywords:
Glass transitions
;
Brillouin and Rayleigh scattering
;
Conference proceedings
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Summary The relaxation processes of glass-forming polymethylacrylate have been studied in a wide temperature range above the glass transition temperatureT g by means of light scattering measurements. Experimental spectra give evidence of a self-similar behaviourI(ω) ∝ ω−(1−a) over a spectral range of 2–3 decades, consistent with the predictions of the mode-coupling theory. Different from the prediction of the theory, the value ofa is strongly temperature dependent. This behaviour has been attributed to the presence of a slow secondary relaxation located in the GHz frequency region, whose strength progressively increases with temperature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02458808
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