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

被引:74
|
作者
Xie, Fengwei [1 ]
Flanagan, Bernadine M. [2 ]
Li, Ming [2 ]
Sangwan, Parveen [3 ]
Truss, Rowan W. [4 ]
Halley, Peter J. [1 ,4 ]
Strounina, Ekaterina V. [5 ]
Whittaker, Andrew K. [1 ,5 ]
Gidley, Michael J. [2 ]
Dean, Katherine M. [3 ]
Shamshina, Julia L. [6 ,7 ]
Rogers, Robin D. [7 ]
McNally, Tony [8 ]
机构
[1] Univ Queensland, Australian Inst Bioengn & Nanotechnol, Brisbane, Qld 4072, Australia
[2] Univ Queensland, Queensland Alliance Agr & Food Innovat, Ctr Nutr & Food Sci, St Lucia, Qld 4072, Australia
[3] CSIRO Mat Sci & Engn, Clayton, Vic 3168, Australia
[4] Univ Queensland, Sch Chem Engn, Brisbane, Qld 4072, Australia
[5] Univ Queensland, Ctr Adv Imaging, Brisbane, Qld 4072, Australia
[6] Univ Alabama, Ctr Green Mfg, Tuscaloosa, AL 35487 USA
[7] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA
[8] Univ Warwick, WMG, Coventry CV4 7AL, W Midlands, England
基金
澳大利亚研究理事会;
关键词
Starch; Ionic liquid; 1-ethyl-3-methylimidazolium acetate; Plasticization; Crystalline structure; Biodegradability; GLASS-TRANSITION TEMPERATURES; C-13 CP/MAS NMR; CORN STARCH; BIOPOLYMER ELECTROLYTES; POLYMER ELECTROLYTES; PHASE-TRANSITION; CASSAVA STARCH; GRANULES; CHLORIDE; CRYSTALLINITY;
D O I
10.1016/j.carbpol.2014.05.058
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
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 Xray diffraction and dynamic mechanical analysis). C-13 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 [Emiml[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. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:841 / 848
页数:8
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