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

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, 111 841-848. doi:10.1016/j.carbpol.2014.05.058


Author 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.
McNally, Tony
Title Characteristics of starch-based films plasticised by glycerol and by the ionic liquid 1-ethyl-3-methylimidazolium acetate: a comparative study
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
1879-1344
Publication date 2014-10-13
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2014.05.058
Open Access Status Not yet assessed
Volume 111
Start page 841
End page 848
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 1605 Organic Chemistry
2505 Materials Chemistry
2507 Polymers and Plastics
2700 Medicine
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.
Keyword 1-ethyl-3-methylimidazolium acetate
Biodegradability
Crystalline structure
Ionic liquid
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 120100344
Institutional Status UQ

 
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