Dynamic mechanical and dielectric characterisation of amylose–glycerol films

The dynamic mechanical, dielectric and calorimetric behaviour of amylose films, plasticised with glycerol, was examined as a function of temperature and glycerol content. Two separate relaxation processes were observed. Whereas the temperature of the lower temperature transition, in the vicinity of...

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Bibliographic Details
Published in:Carbohydrate polymers 2001-03, Vol.44 (3), p.247-253
Main Authors: Moates, G.K, Noel, T.R, Parker, R, Ring, S.G
Format: Article
Language:English
Subjects:
Amylose
Applied sciences
Exact sciences and technology
Glycerol
Natural polymers
Physicochemistry of polymers
Plasticisation
Starch and polysaccharides
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Summary:The dynamic mechanical, dielectric and calorimetric behaviour of amylose films, plasticised with glycerol, was examined as a function of temperature and glycerol content. Two separate relaxation processes were observed. Whereas the temperature of the lower temperature transition, in the vicinity of −50°C, showed a weak dependence on composition, the temperature of the upper transition, in the range 150–50°C, decreased with increasing glycerol content. The activation energy of the lower temperature transition, obtained from the dependence of the frequency of the relaxation peak upon temperature, was typical of a primary α-relaxation or glass transition process. This indicated that although glycerol was an effective plasticiser of amylose, amylose–glycerol mixtures are only partially miscible.
ISSN:0144-8617
1879-1344
DOI:10.1016/S0144-8617(00)00224-1