期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 49, 期 14, 页码 1041-1049出版社
WILEY
DOI: 10.1002/polb.22275
关键词
adsorption; glass transition; kinetics (polym.); starch extrusion
资金
- Curtin University of Technology
In this article, we demonstrated that within a hydrophilic biopolymer-plasticizer system, the molecular activity of the plasticizer also influenced the extent of these interactions. We demonstrated through an analysis of crystallinity and calorimetry results that the equilibrium moisture content within the starch matrix can preferentially interact with the hydrophilic plasticizers and modify the polymer recrystallization process to an extent that the commonly acknowledged relationship between the crystallinity and the glass transition behavior is disrupted. Two plasticizers, glycerol (three -OH groups) and xylitol (five -OH groups), were selected. The water sorption isotherm of polymer samples with 5-20 wt % (dry basis) plasticizers were examined across a water activity range from similar to 0.11 to similar to 0.95 and using Guggenheim-Anderson-de Boer analysis, we compared the molar sorption enthalpies of various starch-plasticizer mixtures. Finally, the competitive plasticization between water and plasticizer molecules at different water activities was also discussed using known glass transition models. The analyses validated the antiplasticization limit for glycerol to be similar to 10-15 wt %, but for xylitol, its antiplasticization behavior did not manifest till 20 wt %. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 1041-1049, 2011
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