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DSC and TGA studies of the behavior of water in native and crosslinked gelatin
Author(s) -
Apostolov A. A.,
Fakirov S.,
Vassileva E.,
Patil R. D.,
Mark J. E.
Publication year - 1999
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/(sici)1097-4628(19990118)71:3<465::aid-app13>3.0.co;2-1
Subject(s) - gelatin , crystallization , amorphous solid , materials science , polymer chemistry , phase (matter) , chemical engineering , chemistry , crystallography , organic chemistry , engineering
Water molecules absorbed into gelatin are found to be only partially crystallizable. The fraction of noncrystallizable water depends on whether the gelatin is native or crosslinked, and on the crosslinking conditions as well. This dependence is explained by the T g ‐regulation effect newly proposed by Rault and coworkers for water‐swollen gelatin cooled below 0°C. According to this effect, a part of the frozen water cannot crystallize because during the cooling the amorphous gelatin–water phase becomes glassy before the water crystallization temperature is reached. During the heating of water‐plasticized gelatin samples in a TGA cell, the crystallizable water separates from the gelatin, mainly in the temperature interval 50–100°C, whereas the noncrystallizable water leaves the gelatin gradually over the entire temperature interval investigated, up to 300°C. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 465–470, 1999