Thermal Transitions in Gelatin and Aqueous Gelatin Solutions
- 1 May 1980
- journal article
- research article
- Published by Taylor & Francis in The Journal of Photographic Science
- Vol. 28 (3) , 128-134
- https://doi.org/10.1080/00223638.1980.11738066
Abstract
On the basis of the characteristic enthalpy changes associated with glass transformation, the glass transition (Tg) in gelatin can be detected readily, in addition to the helix-to-coiltransition, by difTerential scanning calorimetry, and the effects of water content on these transitions can be measured directly. The thermal behaviour of aqueous, deionized bone-gelatin systems with up to about 20 wt";' water is typical of amorphous or partially amorphous polymer-diluent systems depending upon the amount of gelatin structural order developed. Extrapolations of the Tg data to the Tg reported for water and of the helix-to-coiltransition data to that reported for aqueous gelatin solutions containing 90 wt% water are reasonable. Further, the Tg data suggest that the equilibrium water contents of aqueous gelatin systems containing gelatin structural order are higher than those of structureless systems at corresponding relative humidities.Keywords
This publication has 0 references indexed in Scilit: