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Characteristics of starch-based films with different amylose contents plasticised by 1-ethyl-3-methylimidazolium acetate
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Xie, Fengwei, Flanagan, Bernadine M., Li, Ming, Truss, Rowan W., Halley, Peter J., Gidley, Michael J., McNally, Tony, Shamshina, Julia L. and Rogers, Robin D. (2015) Characteristics of starch-based films with different amylose contents plasticised by 1-ethyl-3-methylimidazolium acetate. Carbohydrate Polymers, 122 . pp. 160-168. doi:10.1016/j.carbpol.2014.12.072 ISSN 0144-8617.
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Official URL: http://dx.doi.org/10.1016/j.carbpol.2014.12.072
Abstract
Starch-based films plasticised by an ionic liquid, 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), were prepared by a simple compression moulding process, facilitated by the strong plasticisation effect of [Emim][OAc]. The effects of amylose content of starch (regular vs. high-amylose maize) and relative humidity (RH) during ageing of the samples on a range of structural and material characteristics were investigated. Surprisingly, plasticisation by [Emim][OAc] made the effect of amylose content insignificant, contrary to most previous studies when other plasticisers were used. In other words, [Emim][OAc] changed the underlying mechanism responsible for mechanical properties from the entanglement of starch macromolecules (mainly amylose), which has been reported as a main responsible factor previously. The crystallinity of the plasticised starch samples was low and thus was unlikely to have a major contribution to the material characteristics, although the amylose content impacted on the crystalline structure and the mobility of amorphous parts in the samples to some extent. Therefore, RH conditioning and thus the sample water content was the major factor influencing the mechanical properties, glass transition temperature, and electrical conductivity of the starch films. This suggests the potential application of ionic liquid-plasticised starch materials in areas where the control of properties by environmental RH is desired.
Item Type: | Journal Article | ||||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||
Library of Congress Subject Headings (LCSH): | Starch, Humidity | ||||||||||
Journal or Publication Title: | Carbohydrate Polymers | ||||||||||
Publisher: | Pergamon Press | ||||||||||
ISSN: | 0144-8617 | ||||||||||
Official Date: | 20 May 2015 | ||||||||||
Dates: |
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Volume: | 122 | ||||||||||
Number of Pages: | 9 | ||||||||||
Page Range: | pp. 160-168 | ||||||||||
DOI: | 10.1016/j.carbpol.2014.12.072 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 17 December 2018 | ||||||||||
Date of first compliant Open Access: | 17 December 2018 | ||||||||||
Funder: | Australian Research Council (ARC), China Scholarship Council (CSC), University of Queensland | ||||||||||
Grant number: | 120100344 (ARC) |
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