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Spectres ultrasonores de solutions diluées de polystyrène et de quelques derivés—I. Poly(α-Méthylstyrène) et |
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| Authors: | B Froelich H Ott C Noel J Lewiner L Monnerie R Cerf |
| Institution: | 1. Laboratoire de Physico-chimie Structurale et Macromoléculaire associé au C.N.R.S., Ecole Supérieure de Physique et Chimie Industrielle, 10, rue Vauquelin, 75231 Paris Cedex 05, France;2. Laboratoire d''Electricité Générale, Ecole Supérieure de Physique et Chimie Industrielle, 10, rue Vauquelin, 75231 Paris Cedex 05, France;3. Laboratoire d''Acoustique Moléculaire, Equipe de Recherche Associée au C.N.R.S., Université Louis Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg Cedex, France |
| Abstract: | Ultrasonic absorption data were obtained over the frequency range 0·3–150 MHz for dilute solutions of polystyrene, poly(α-methylstyrene) and poly(o-bromostyrene). We have shown that for polystyrene and poly(α-methylstyrene) the spectra are very similar and can be resolved into two relaxations. A bromine atom ortho in the benzene ring affects the ultrasonic spectrum which shows three relaxation times at least. Investigation of the temperature dependence also has shown a different behaviour for poly(o-bromostyrene). |
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