Effect of Drying Temperature on Physical Properties of Thin Gelatin Films

The molecular morphology of thin gelatin films, controlled through the casting temperature, was monitored by wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). Gelatin films dried at lower temperatures had a markedly higher crystalline or helical structure with a slight...

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Bibliographic Details
Published in:Drying technology 2014-01, Vol.32 (1), p.30-38
Main Authors: Badii, F, MacNaughtan, W, Mitchell, J. R, Farhat, I. A
Format: Article
Language:English
Subjects:
crystal structure
Crystallinity
Differential scanning calorimetry
Diffraction
diffusivity
Drying agents
drying temperature
gelatin
Gelatin film
glass transition
Hysteresis
Phase transitions
Physical aging
sorption
Sorption/desorption isotherm
Temperature effects
Thin films
vapors
X-ray diffraction
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Summary:The molecular morphology of thin gelatin films, controlled through the casting temperature, was monitored by wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). Gelatin films dried at lower temperatures had a markedly higher crystalline or helical structure with a slightly higher T g and lower ΔC ₚ compared with hot dried films, which had a more coiled structure. The relationship between molecular morphology and gelatin-water interaction in terms of hydration behavior and water diffusivity was assessed using dynamic vapor sorption (DVS). The sorption capacity increased and the level of hysteresis decreased with increasing the degree of crystallinity. The difference in the aging behavior of the films was explained in terms of the difference between the glass transition and aging temperatures, (Tg – Ta).
ISSN:1532-2300
0737-3937
1532-2300
DOI:10.1080/07373937.2013.808206