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CONDUCTING BLENDS OF POLY (2-VINYL PYRIDINE) AND POLYETHYLENE OXIDE WITH HIGH MOLECULAR WEIGHT

Cui Minhu

Abstract

Ionic, electronic and mixed (ionic-electronic) conductivities of blends of poly(2-vinylpyridine) (P2VP) and poly(ethylene oxide) (PEO) with high molecular weight after dopedwith LiClO_4, TCNQ or LiClO_4 and TCNQ were investigated. Effects of LiClO_4 and TCNQconcentrations on the conductivity of PEO/P2VP/LiClO_4 or TCNQ blend were studied.The ionic conductivity of PEO/P2VP/LiClO_4 blend increases with increasing PEO content.At a Li/ethylene oxide molar ratio of 0.10 and a TCNQ/2-vinyl pyridine molar ratio of 0.5,the mixed conductivity of PEO / P2VP / LiClO_4 / TCNQ is higher than the total of ionicconductivity of PEO/P2VP/LiClO_4 and electronic conductivity of PEO/P2VP/TCNQwhen the weight ratio of PEO and P2VP is 6/4 or 5/5. Scanning electron microscopy(SEM) on the broken cross-section of the PEO/P2VP/LiClO_4 blend and differential scan-ning calorimetry (DSC) results show that LiClO_4 could act as a compatibilizer in the blend.

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Key concepts: Differential scanning calorimetry, Ionic conductivity, Ethylene oxide, Materials science, Polymer chemistry, Oxide, Ionic bonding, Lithium perchlorate