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vol. 4, nr. 1 (2004)
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Glass-rubber transition in starch-sorbitol film
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Danuta M. Napierała1, Piotr Biskupski2, Alina Nowotarska1, Stefan Poliszko1
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1 Department of Physics, University of Agriculture, ul. Wojska Polskiego 38/42, 60-637 Poznań |
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2 Faculty of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznań |
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vol. 4 (2004), nr. 1,
pp. 105-113
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abstract:
Rheological behaviour of wheat starch-sorbitol films, obtained by the casting/ evaporation method from solution has been studied by the dynamic mechanical-thermal analysis (DMTA). The dispersion curves of the storage and loss moduli have revealed characteristic sharply outlined glass transition in the temperature range of 270-300 K, with transition point Tg changing depending on the drying conditions and frequency of the tensile stress applied. The method of data transformation based on the theory of Williams-Landel-Ferry involving the frequency shift to superimpose the time-temperature dependence of viscoelastic properties has been used to produce a master curve for the starch-sorbitol film.
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keywords:
starch film, sorbitol, DMTA, glass transition, WLF equation
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original in:
Polish
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