Preparation and characterization of low environmental humidity sensitive ionic liquid polymer electrolytes

Abstract

Methyl 3-(3-(2-hydroxyethyl)imidazole-1-yl)propanoate chloride salt (IL-Cl), methyl 3-(3-(2-hydroxyethyl)imidazole-1-yl)propanoate bromate salt (IL-Br), and their derivatives modified by polyethylene glycol (PEG) through ester-exchange reaction (ILPEGs) were synthesized. First, the properties of those materials, especially their conductivity, have been extensively studied. Second, using the IL-PEG with the highest conductivity as a plasticizer and electrolyte, a series of gel polymer electrolytes were successfully fabricated from polyurethane, poly-1,4-butylene adipate glycol 2000, and IL-PEGs by melting blends with different mass ratios in a Haake torque rheometer. The surface morphology, thermal properties, and the surface resistivity of gel polymer electrolytes were studied by scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, and surface resistivity test, respectively. Scanning electron microscopy pictures showed that the surface of polymer electrolyte is smoother than that without added ILPEGs. Thermogravimetric analysis results revealed that the polymer electrolytes will not decompose when the processing temperature is below 275 C. It was found that the surface resistivity of polymer electrolytes can be below 10 9 X, showing a good antistatic property, and it changes slightly as the relative humidity decreases from 40% to 0.1%, indicting that the material has low humidity sensitivity. This study is a new demonstration and development in ionic liquid based polymer electrolyte. V C 2014 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2014, 131, 40675.

Ionic Liquid–Polymer Composites: A New Platform for Multifunctional Applications

“…The combination of polymers and ILs was also studied for the development of humidity sensors based on two different ILs, methyl 3‐(3‐(2‐hydroxyethyl)imidazole‐1‐yl)propanoate chloride salt (IL‐Cl), methyl 3‐(3‐(2 hydroxyethyl)imidazole‐1‐yl)propanoate bromate salt (IL‐Br). [ 47 ] The IL‐PEG electrolyte, with a molar ratio of 4:1 of IL‐Br to IL‐Cl, were synthesized through an ester‐exchange reaction and later these IL‐PEG composites were mixed with polyurethane (PU) and poly‐1,4‐butylene adipate glycol (PBA) forming PU/PBA/IL‐PEG composites with different IL‐PEG contents. The IL‐PEG acted as an antistatic agent under low relative humidity (RH) with the surface resistivity of the composites changing very slightly at different RH percentages ( Figure a).…”

“…These results also showed that the synthesized composites could be used as antistatic materials. [ 47 ]…”

“…Reprinted with permission from. [ 47 ] b) The sensitivity of the [Bmim][FeCl 4 ]/PVDF composites comprising different IL contents (5, 10, and 20 wt%.) to humidity.…”

Self‐assembly and antistatic property of ionic liquid crystalline polymers

“…Ionic LC materials have been widely used in soft materials, 14,15 ion‐conducting materials, 16–19 and antimicrobial finishing materials 20 up to now. Furthermore, they will provide infinite possibilities for more applications in permanent antistatic agents similar to polymerized ionic liquid that are considered to be promising additives 21–24 . Inspired by previous strategies to prepared antistatic materials, we endeavor to utilize isophthaloyl chloride, bromo‐alkane‐dioyl dichloride, 4,4′‐biphenol, isosorbide, and 4,4′‐bipyridine as polymeric raw material with the aim of preparing ionic liquid crystalline polymers (ILCPs) containing quaternary ammonium salt groups with excellent ionic conductivity and competent antistatic performance.…”