화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.53, No.2, 249-255, 2015
Effects of Polyethylene Spacer Length in Polymeric Electrolytes on Gelation of Ionic Liquids and Ionogel Properties
Polymer electrolytes containing N,N-(trans-cyclohexane-1,4-diyl)dibenzamide linkages, polyethylene ((CH2)(m), m = 2, 4, 10) spacers, and bis(trifluoromethanesulfonyl)amide (TFSA) or bis(fluorosulfonyl)amide (FSA) counteranions (polymer abbreviation: CDBAm center dot X; m = 2, 4, 10; X = TFSA, FSA) have been synthesized, adding to our previous report (m = 6). In addition, their ability to effect the gelation of six ionic liquids and the properties of the resulting ionogels have been examined. The polymers, except for CDBA10 center dot TFSA, effect the gelation for all ionic liquids used in this study at fairly low concentrations (0.9-50 g/L). Ionogel ionic conductivity is not dependent on the spacer length, but does decrease slightly as increasing amounts of the gelatinizer are introduced. In contrast to ionic conductivity, the temperatures at which these ionogels transition into isotropic fluids is dependent on the spacer length; the gel composed of [EMI][FSA] and 100 g/L of CDBA6 center dot FSA transforms at 120 degrees C, while the gel composed of [EMI][FSA] and 5 g/L of CDBA2 center dot FSA does not transform into a sol even when temperatures become 155 degrees C. In brief, ionogel heat resistance can be improved by changing the spacer length of the polyelectrolyte. Finally, it has been determined using cyclic voltammetry that the potential window of the polyelectrolytes is particularly wide, ranging from -1.6 to 2.5 V. (c) 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 249-255