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  • 1 Hunt-Wesson, Inc. 1645 W. Valencia Dr. Fullerton CA 92833-3899 1645 W. Valencia Dr. Fullerton CA 92833-3899
  • | 2 Ortel Corporation 2015 W. Chestnut St. Alhambra CA 91803-1542 2015 W. Chestnut St. Alhambra CA 91803-1542
  • | 3 Department of Food Science and Human Nutrition 905 S. Goodwin Ave. Urbana IL 61801 USA 905 S. Goodwin Ave. Urbana IL 61801 USA
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Abstract  

The physical aging characteristics of maltose glasses aged at two temperatures below the glass transition temperature, Tg, (Tg-10C and Tg-20C) from 5 to 10 000 min were measured by standard differential scanning calorimetry (SDSC) and modulated differential scanning calorimetry (MDSC). The experimentally measured instrumental Tg, the calculated Tg, and the excess enthalpy values were obtained for aged glasses using both DSC methods. The development of excess enthalpy as a function of aging time, as measured by both SDSC and MDSC, was fit using the Cowie and Ferguson and Tool-Narayanswamy-Moynihan models. The change in the Tg values and the development of the excess enthalpy resulting from physical aging measured by the two DSC methods are discussed.

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