Effect of the ionic liquid 1-ethyl-3-methylimidazolium acetate on the phase transition of starch: Dissolution or gelatinization?

Mateyawa, Sainimili; Xie, Fengwei; Truss, R. W.; Halley, P. J.; Nicholson, Timothy M.; Shamshina, Julia L.; Boehm, Michael W.; McNally, Tony

doi:10.1016/j.carbpol.2013.01.024

Cited by 81 publications

(66 citation statements)

References 53 publications

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“…For RMS-E27, it appears that the sample was melting rather than gelatinizing, as it does not show a gelatinisation peak. This behaviour could be explained by an observation in a study by Mateyawa et al (Mateyawa et al, 2013) who showed that as the proportion of [Emim][OAc] increased, the blend dissolved prior to gelatinisation at low temperatures. Therefore, in the RMS-E27 sample here it is suggested that the starch had dissolved prior to processing, hence a high viscosity and high torque were observed initially The samples had subtle differences in their nature after mixing.…”

Section: Mixing Torquementioning

confidence: 99%

“…A study has been carried out to observe the mechanism of IL (in this case [Emim][OAc]) effects on different starches (Mateyawa et al, 2013). It is reported that IL actually behaves as a solvent rather than a gelatinisation agent as shown by DSC.…”

Section: Ionic Liquid/starch Interactionmentioning

confidence: 99%

“…Recently there has been an interest in the use of Ionic Liquids (ILs) for this purpose. For example, 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) has been suggested because of its strong interaction potential and non-toxic nature (Mateyawa et al, 2013).…”

Section: Project Backgroundmentioning

confidence: 99%

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Highly functional green materials platform: Starch-ionic liquid-carbon nanotube polymer melt nanocomposites

Liu¹

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Starch is a promising biodegradable polymer material which has attracted attention recently. A renewable and biodegradable resource can potentially address the shortage of conventional petroleum-based polymers and help solve the problem of environmental pollution from the use of these polymers. To use starch in polymer processing, gelatinisation, which is the process to disrupt the native starch structure, must happen to turn the starch in to an amorphous thermoplastic starch (TPS). However, water, the conventional gelatinisation agent and plasticiser, is extremely volatile and will evaporate during thermal processing. This leads to high melt viscosities, processing difficulties and hence poor product quality. In addition the mechanical properties of the resulting TPS products are not as high as that of the currently used petroleum-based polymers that they seek to replace.Therefore, potential solutions for TPS processing and application development is to use other plasticisers to aid processing and/or to reinforce TPS with nano-particles. One of the key tasks of this project was to understand the plasticizing effects of ionic liquids (ILs) in TPS processing and interpreting these in terms of the molecular interactions between the components. In addition the role of adding nano-particles, in the form of carbon nanotubes, in an attempt to strengthen TPS was investigated. The ultimate aim was to provide design guidelines to produce high value added biodegradable nanocomposites.Three types of ionic liquids (ILs) were considered: 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), 1-allyl-3-methylimidazolium chloride ([Amim]Cl) and 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). They were processed in batches of 150g by thermal mixing. Their behaviours were compared to glycerol as plasticisers of TPS, and their effects on TPS processing, water uptake during conditioning, mechanical properties, thermal stabilities, crystallisation behaviour and molecular interaction were studied. Both spectroscopic and X-ray analysis techniques were used to investigate the interactions that occurred, and these were related to the material characteristics. Then, multi-walled carbon nanotubes (MWCNTs) were introduced to the TPS matrix to investigate their behaviour as a strengthening agent and also to potentially create a functional material with useful electrical properties.The results demonstrated that the ILs were effective plasticisers for TPS. However, whilst their use improved the flexibility of TPS, mechanical strength and thermal stability were decreased.The molecular interactions between TPS and ILs were found to differ between TPS and glycerol. This led to differences in the crystalline structures formed, 2% to 4% more water Page | iii uptake during conditioning and hence up to a 90% decrease in Young's modulus. In particular the effect of water uptake during conditioning was identified as the key contributor to the ultimate mechanical properties. The IL plasticised TPS were also found to be less thermally stable.In or...

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Section: Mixing Torquementioning

confidence: 99%

Section: Ionic Liquid/starch Interactionmentioning

confidence: 99%

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Highly functional green materials platform: Starch-ionic liquid-carbon nanotube polymer melt nanocomposites

Liu¹

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“…The use of polyols (glycerol, glycol, sorbitol, etc) and nitrogen containing compounds (urea, ammonium and amines) as plasticizers are reported in the literature (Liu, Xie, Yu, Chen & Li, 2009;Xie, Halley & Averous, 2012 (Wilpiszewska & Spychaj, 2011;Liu & Budtova, 2013, Mateyawa et al, 2013Jordon, Scmidt, Liebert & Heinze, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The imidazolium based ionic liquids, are reported to be more efficient solvents for polysaccharides than NaOH-water system, dissolving more cellulose (20 % wt) and are reckoned to be better starting materials for fibres, films and aerogels (Kosan, Michels & Meister, 2008;Liu & Budtova, 2013;Remsing, Swatloski, Rogers & Moyna, 2006;Cai, Zhang, Guo). Recently, the dissolving and plasticizing ability of imidazolium based ionic liquids on starch, particularly, [Emim][OAc] (Wilpiszewska & Spychaj, 2011;Liu & Budtova, 2013;Mateyawa et al, 2013) …”

Section: Introductionmentioning

confidence: 99%

Understanding the role of water-ionic liquid mixtures on the gelatinization and dissolution of maize starches

Mateyawa¹

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The catastrophic impact of petroleum based plastics on our environment has resulted in the development of a new class of biodegradable polymers. Starch is an attractive raw material for biodegradable plastic applications due to its low cost, sustainability and its availability in large quantities. Besides, it can be transformed into thermoplastic material using conventional plastic processing techniques. Despite its attractive potential as a source of biopolymer materials, the use of starch-based plastic products has been restricted to niche markets that do not require high performance applications due to poor mechanical properties and moisture sensitivity of the materials. Starch cannot be thermally processed without water but thermoplastic starch materials developed from water are brittle due to retrogradation. Much research has been devoted to the use of plasticizers other than water. Non-volatile plasticizers such as glycerol, glycol, sorbitol, urea and ammonium derived amines have mainly been used in the plasticization of starch, but due to their high water sensitivity, recent researches have diverted to novel plasticizers, particularly the ionic liquids. Possible explanation for this behaviour is suggested.iv

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Starch, Treatment, and Modification

Wang

Ren

Wang

2020

Kirk-Othmer Encyclopedia of Chemical Technology

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Starch is a homopolysaccharide composed of glucose units and has the advantages of low cost, biodegradability, renewability, and availability. Native starch is not always suitable for many applications. Therefore, modification of starch is studied to improve the functional limitations of native starches. Starch modification generally includes physical, chemical, enzymatic, and genetic bioengineering methods. The modification of starch is a reliable protocol with countless possibilities to generate novel starches with new functional properties and added value for various food and nonfood applications. This article reviews the structures and functional properties of physically, chemically, enzymatically, genetically, and dually modified starches and their applications in industry.

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Effect of the ionic liquid 1-ethyl-3-methylimidazolium acetate on the phase transition of starch: Dissolution or gelatinization?

Cited by 81 publications

References 53 publications

Highly functional green materials platform: Starch-ionic liquid-carbon nanotube polymer melt nanocomposites

Highly functional green materials platform: Starch-ionic liquid-carbon nanotube polymer melt nanocomposites

Understanding the role of water-ionic liquid mixtures on the gelatinization and dissolution of maize starches

Starch, Treatment, and Modification

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