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Different characteristic effects of ageing on starch-based films plasticised by 1-ethyl-3-methylimidazolium acetate and by glycerol
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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 . pp. 67-79. doi:10.1016/j.carbpol.2016.03.056 ISSN 0144-8617.
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WRAP-different-characteristic-effects-ageing-starch-based-films-plasticised-1-ethyl-3-methylimidazolium-Xie-2016.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1732Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.carbpol.2016.03.056
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.
Item Type: | Journal Article | ||||||||||||
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Subjects: | T Technology > TP Chemical technology | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||
Library of Congress Subject Headings (LCSH): | Plasticizers, Starch | ||||||||||||
Journal or Publication Title: | Carbohydrate Polymers | ||||||||||||
Publisher: | Pergamon Press | ||||||||||||
ISSN: | 0144-8617 | ||||||||||||
Official Date: | August 2016 | ||||||||||||
Dates: |
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Volume: | 146 | ||||||||||||
Page Range: | pp. 67-79 | ||||||||||||
DOI: | 10.1016/j.carbpol.2016.03.056 | ||||||||||||
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 | ||||||||||||
RIOXX Funder/Project Grant: |
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