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Issue 8, 1999
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Carbon-13 nuclear magnetic relaxation in supercooled liquid and glassy maltose

Abstract

13 C longitudinal relaxation rates (T1-1) in highly viscous liquid and solid amorphous maltose, its mixtures with water and methanol, and also crystalline maltose monohydrate, have been measured as a function of temperature, above and below the calorimetric glass transition temperatures of the amorphous materials. From the results it is concluded that, at temperatures up to 60°C below the glass transition temperature, the carbon atoms in the exocyclic hydroxymethyl groups of maltose are more mobile than the endocyclic carbon atoms. A few percent of water is sufficient to considerably enhance amorphous maltose mobility. At temperatures close to the glass transition methanol in amorphous maltose–methanol mixtures retains a high degree of rotational mobility which is decoupled from the bulk viscosity.

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Article information


Phys. Chem. Chem. Phys., 1999,1, 1927-1931
Article type
Paper

Carbon-13 nuclear magnetic relaxation in supercooled liquid and glassy maltose

R. Hans Tromp, D. van Dusschoten, R. Parker and S. G. Ring, Phys. Chem. Chem. Phys., 1999, 1, 1927
DOI: 10.1039/A808667B

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