Abstract
Concentrated solutions (volume fraction 0.1–0.9) of polystyrene (PS) in toluene and of polybutylacrylate (PBA) in dioxane have been examined using dynamic light scattering (DLS) as a function of angle and temperature. With PS there is a pronounced maximum in the cooperative diffusion coefficient (D c) at about Φ=0.5 as the glassy state is approached. By contrast, with PBA, which has a very low T g, there is a crossover to a stronger concentration dependence for D c, which is attributed to an increase in solvent mobility. In the PS/toulene system at Φ=0.78 a transition is noted between the diffusion mode and the main relaxational mode. At 17°C q-independence is observed and at 50 °C q 2-dependence. At Φ=0.89, both relaxations are observed simultaneously in the DLS time window, the slower process being a structural relaxation.
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© 1993 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Brown, W. (1993). Dynamics in concentrated polymer solutions studied using dynamic light scattering. In: Ewen, B., Fischer, E.W., Fytas, G. (eds) Application of Scattering Methods to the Dynamics of Polymer Systems. Progress in Colloid & Polymer Science, vol 91. Steinkopff. https://doi.org/10.1007/BFb0116471
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DOI: https://doi.org/10.1007/BFb0116471
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