Interactions of hydrophilic plasticizer molecules with amorphous starch biopolymer - an investigation into the glass transition and the water activity behaviour.

Liu, Huihua, Chaudhary, Deeptangshu, Ingram, Gordon and John, Joseph (2011) Interactions of hydrophilic plasticizer molecules with amorphous starch biopolymer - an investigation into the glass transition and the water activity behaviour.. Journal of Polymer Science Part B: Polymer Physics, 49 14: 1041-1049.


Author Liu, Huihua
Chaudhary, Deeptangshu
Ingram, Gordon
John, Joseph
Title Interactions of hydrophilic plasticizer molecules with amorphous starch biopolymer - an investigation into the glass transition and the water activity behaviour.
Journal name Journal of Polymer Science Part B: Polymer Physics  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2011-07-15
Sub-type Article
DOI 10.1002/polb.22275
Volume number 49
Issue number 14
ISSN 0887-6266; 1099-0488
Start page 1041
End page 1049
Total pages 9
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Abstract 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 ∼0.11 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 ∼10-15 wt %, but for xylitol, its antiplasticization behavior did not manifest till 20 wt %.
Keyword Adsorption
Glass transition
Kinetics (polym.)
Starch extrusion
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Access Statistics: 16 Abstract Views  -  Detailed Statistics
Created: Tue, 24 Jul 2012, 12:12:13 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre