Different characteristic effects of ageing on starch-based films plasticised by 1-ethyl-3-methylimidazolium acetate and by glycerol

Zhang, Binjia, Xie, Fengwei, Zhang, Tianlong, Chen, Ling, Li, Xiaoxi, Truss, Rowan W., Halley, Peter J., Shamshina, Julia L., McNally, Tony and Rogers, Robin D. (2016) Different characteristic effects of ageing on starch-based films plasticised by 1-ethyl-3-methylimidazolium acetate and by glycerol. Carbohydrate Polymers, 146 67-79. doi:10.1016/j.carbpol.2016.03.056


Author Zhang, Binjia
Xie, Fengwei
Zhang, Tianlong
Chen, Ling
Li, Xiaoxi
Truss, Rowan W.
Halley, Peter J.
Shamshina, Julia L.
McNally, Tony
Rogers, Robin D.
Title Different characteristic effects of ageing on starch-based films plasticised by 1-ethyl-3-methylimidazolium acetate and by glycerol
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
1879-1344
Publication date 2016-08-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2016.03.056
Open Access Status Not Open Access
Volume 146
Start page 67
End page 79
Total pages 13
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Abstract The focus of this study was on the effects of plasticisers (the ionic liquid 1-ethyl-3-methylimidazolium acetate, or [Emim][OAc]; and glycerol) on the changes of starch structure on multiple length scales, and the variation in properties of plasticised starch-based films, during ageing. The films were prepared by a simple melt compression moulding process, followed by storage at different relative humidity (RH) environments. Compared with glycerol, [Emim][OAc] could result in greater homogeneity in [Emim][OAc]-plasticised starch-based films (no gel-like aggregates and less molecular order (crystallites) on the nano-scale). Besides, much weaker starch-starch interactions but stronger starch-[Emim][OAc] interactions at the molecular level led to reduced strength and stiffness but increased flexibility of the films. More importantly, [Emim][OAc] (especially at high content) was revealed to more effectively maintain the plasticised state during ageing than glycerol: the densification (especially in the amorphous regions) was suppressed; and the structural characteristics especially on the nano-scale were stabilised (especially at a high RH), presumably due to the suppressed starch molecular interactions by [Emim][OAc] as confirmed by Raman spectroscopy. Such behaviour contributed to stabilised mechanical properties. Nonetheless, the crystallinity and thermal stability of starch-based films with both plasticisers were much less affected by ageing and moisture uptake during storage (42 days), but mostly depended on the plasticiser type and content. As starch is a typical semi-crystalline bio-polymer containing abundant hydroxyl groups and strong hydrogen bonding, the findings here could also be significant in creating materials from other similar biopolymers with tailored sensitivity and properties to the environment.
Keyword 1-Ethyl-3-methylimidazolium acetate
Ageing
Ionic liquid
Plasticizer
Relative humidity
Starch-based materials
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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