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Thermal properties measurements of renatured gelatin using conventional and temperature modulated differential scanning calorimetry
Author(s) -
Dai ChiAn,
Chen YiFan,
Liu MingWei
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22711
Subject(s) - gelatin , differential scanning calorimetry , materials science , glass transition , amorphous solid , endotherm , calorimetry , polymer chemistry , melting point , composite material , polymer , thermodynamics , chemistry , crystallography , organic chemistry , physics
Abstract The thermal properties of amorphous gelatin films and gelatin films with renatured structural order were measured by using conventional and temperature modulated differential scanning calorimetry (DSC). Different amounts of gelatin structural order associated with a melting enthalpic change in the DSC measurement were prepared based on different gelatin drying conditions. Two consecutive heating and cooling DSC measurements on the gelatin films showed that there was no change in the glass‐transition temperature ( T g ) for the amorphous gelatin but there was a decrease in the T g for the structural gelatin on the second DSC scan. This decrease was attributed to the plasticizing effect from the release of originally hydrogen‐bonded water associated with the structural gelatin. In addition, a reversing endotherm observed upon melting of the structural gelatin during a temperature modulated DSC measurement indicated that the transition of bound water to free water occurred as the partial triple‐helix gelatin melted. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1795–1801, 2006