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Characteristics of starch-based films plasticised by glycerol and by the ionic liquid 1-ethyl-3-methylimidazolium acetate : a comparative study

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Xie, Fengwei, Flanagan, Bernadine M., Li, Ming, Sangwan, Parveen, Truss, Rowan W., Halley, Peter J., Strounina, Ekaterina V., Whittaker, Andrew K., Gidley, Michael J., Dean, Katherine M., Shamshina, Julia L., Rogers, Robin D. and McNally, Tony (2014) Characteristics of starch-based films plasticised by glycerol and by the ionic liquid 1-ethyl-3-methylimidazolium acetate : a comparative study. Carbohydrate Polymers, 111 . pp. 841-848. doi:10.1016/j.carbpol.2014.05.058

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Official URL: http://dx.doi.org/10.1016/j.carbpol.2014.05.058

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Abstract

This paper reports the plasticisation effect of the ionic liquid, 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), as compared with the traditionally used plasticiser, glycerol, on the characteristics of starch-based films. For minimising the additional effect of processing, a simple compression moulding process (which involves minimal shear) was used for preparation of starch-based films. The results show that [Emim][OAc] was favourable for plasticisation, i.e., disruption of starch granules (by scanning electron microscopy), and could result in a more amorphous structure in the starch-based materials (by X-ray diffraction and dynamic mechanical analysis). 13C CP/MAS and SPE/MAS NMR spectroscopy revealed that not only was the crystallinity reduced by [Emim][OAc], but also the amorphous starch present was plasticised to a more mobile form as indicated by the appearance of amorphous starch in the SPE/MAS spectrum. Mechanical results illustrate that, when either glycerol or [Emim][OAc] was used, a higher plasticiser content could contribute to higher flexibility. In spite of the accelerated thermal degradation of starch by [Emim][OAc] as shown by thermogravimetric analysis, the biodegradation study revealed the antimicrobial effect of [Emim][OAc] on the starch-based materials. Considering the high-amylose starch used here which is typically difficult to gelatinise in a traditional plasticiser (water and/or glycerol), [Emim][OAc] is demonstrated to be a promising plasticiser for starch to develop “green” flexible antimicrobial materials for novel applications.

Item Type: Journal Article
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, Glycerin
Journal or Publication Title: Carbohydrate Polymers
Publisher: Pergamon Press
ISSN: 0144-8617
Official Date: 13 October 2014
Dates:
DateEvent
13 October 2014Published
29 May 2014Available
21 May 2014Accepted
6 May 2014Submitted
Volume: 111
Page Range: pp. 841-848
DOI: 10.1016/j.carbpol.2014.05.058
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
120100344[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
UNSPECIFIEDChina Scholarship Councilhttp://dx.doi.org/10.13039/501100004543
UNSPECIFIED[MEPRC] Ministry of Education of the People's Republic of Chinahttp://dx.doi.org/10.13039/501100002338

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