Off-Critical Phase Separation and Gelation in Solutions of Gelatin and Dextran

The phase separation kinetics have been studied with Small angle light scattering (SALS) in strongly asymmetric aqueous mixtures of gelatin and dextran, above and below the gelation temperture of gelatin. The focus is on solutions with gelatin as the majority component. The phase separation gives ri...

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Published in:Macromolecules 1996-12, Vol.29 (25), p.8109-8116
Main Authors: Tromp, R. H, Jones, R. A. L
Format: Article
Language:English
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Applied sciences
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
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description The phase separation kinetics have been studied with Small angle light scattering (SALS) in strongly asymmetric aqueous mixtures of gelatin and dextran, above and below the gelation temperture of gelatin. The focus is on solutions with gelatin as the majority component. The phase separation gives rise to a distribution of dextran-rich spheres in a gelatin-rich matrix. The SALS pattern shows a maximum, which was interpreted as being due to the interplay between the scattering from dextran-rich nuclei and a surrounding layer depleted in dextran (depletion layer). The size and concentration of the spherical nuclei and their depletion layers were followed in time at temperatures above and below the gelation temperature of the matrix. The results show a strong and complex dependence on temperature and total polymer concentration of the separation kinetics.
doi_str_mv 10.1021/ma9606566
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Applied sciences
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
title Off-Critical Phase Separation and Gelation in Solutions of Gelatin and Dextran
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