Characteristics of starch-based films with different amylose contents plasticised by 1-ethyl-3-methylimidazolium acetate

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, 122 160-168. doi:10.1016/j.carbpol.2014.12.072


Author Xie, Fengwei
Flanagan, Bernadine M.
Li, Ming
Truss, Rowan W.
Halley, Peter J.
Gidley, Michael J.
McNally, Tony
Shamshina, Julia L.
Rogers, Robin D.
Title Characteristics of starch-based films with different amylose contents plasticised by 1-ethyl-3-methylimidazolium acetate
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
1879-1344
Publication date 2015-05-20
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2014.12.072
Open Access Status
Volume 122
Start page 160
End page 168
Total pages 9
Place of publication Kidlington, Oxford, United Kingdom
Publisher Elsevier
Collection year 2016
Language eng
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.
Keyword 1-Ethyl-3-methylimidazolium acetate
Amylose/amylopectin ratio
Ionic liquid
Plasticisation
Relative humidity
Starch
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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