Facile Preparation of Starch-Based Electroconductive Films with Ionic Liquid

Abstract

Here, we discovered that starch could be straightforwardly processed into optically-transparent electroconductive films, by compression molding at a relatively mild temperature (55 °C or 65 °C), much lower than those commonly used in biopolymer melt processing (typically over 150 °C). Such significantly-reduced processing temperature was achieved with the use of an ionic liquid plasticizer, 1-ethyl-3-methylimidazolium acetate reduced the thermal decomposition temperature of starch by 30 °K, while the formulation and processing conditions did not affect the film thermal stability.

Starch–zinc complex and its reinforcement effect on starch-based materials

“…films are transparent, suggesting excellent plasticization. Since CM involves little shear treatment (Xie et al, 2014;Zhang et al, 2017) and the temperature here (120 °C) was lower than that (160 °C) used in a previous study for the preparation of Gelose 80 starch-based materials plasticized by water-glycerol or water-ionic liquid mixtures (Xie et al, 2015;Zhang et al, 2016), the excellent plasticization effect of ZnCl2 solutions is demonstrated. and (h) were those of W-30/MC, respectively.…”

“…2018), poly(trimellitic glyceride) (Zhang, Cheng, Lin, Zhou, & Zhu, 2018), ionic liquids (Liu & Jin, 2016;Xie et al, 2014;Zhang et al, 2016;Zhang et al, 2017) and eutectic solvents (Magdalena & Caisa, 2017). However, these plasticizers always have their respective disadvantages such as poor stability, low efficiency, high toxicity, and high costs.…”

The Importance of Ionic Liquids in the Modification of Starch and Processing of Starch-Based Materials

“…The most commonly used ILs for the purposes of dissolving [ 42 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ] and plasticizing [ 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] are 1-butyl-3-methylimidazolium chloride [BMIM]Cl, 1-allyl-3-methylimidazolium chloride [AMIM]Cl, and 1-ethyl-3-methylimidazolium acetate [EMIM]Ac ( Table 2 ) [ 42 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ]. The structural formulas of these and other popular ILs for the processing of starch-based materials are shown in Figure 6 .…”

“…This is a great advantage from a mechanical and processing standpoint. Zhang et al demonstrated that 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) may successfully modify starch into optically transparent electroconductive films [ 63 ]. The addition of this IL significantly reduced the processing temperature by compression molding at a relatively mild temperature (ranging between 55 and 65 °C), much lower than those commonly used in biopolymer melt processing (mostly over 150 °C).…”

A further study on supramolecular structure changes of waxy maize starch subjected to alkaline treatment by extended-q small-angle neutron scattering

“…For the power-law regime, a unified model Eq. (1) (Beaucage, 2004;Zhang et al, 2017b) was used to fit the relevant scattering data.…”