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Polymers 2013, 5(3), 937-953; doi:10.3390/polym5030937

Supramolecular Functionalities Influence the Thermal Properties, Interactions and Conductivity Behavior of Poly(ethylene glycol)/LiAsF6 Blends

1
Institute of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
2
Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 6 May 2013 / Revised: 20 June 2013 / Accepted: 20 June 2013 / Published: 4 July 2013
(This article belongs to the Special Issue Supramolecular Chemistry and Self-Assembly)
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Abstract

In this study, we tethered terminal uracil groups onto short-chain poly(ethylene glycol) (PEG) to form the polymers, uracil (U)-PEG and U-PEG-U. Through AC impedance measurements, we found that the conductivities of these polymers increased upon increasing the content of the lithium salt, LiAsF6, until the Li-to-PEG ratio reached 1:4, with the conductivities of the LiAsF6/U-PEG blends being greater than those of the LiAsF6/U-PEG-U blends. The ionic conductivity of the LiAsF6/U-PEG system reached as high as 7.81 × 10−4 S/cm at 30 °C. Differential scanning calorimetry, wide-angle X-ray scattering, 7Li nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy revealed that the presence of the uracil groups in the solid state electrolytes had a critical role in tuning the glass transition temperatures and facilitating the transfer of Li+ ions.
Keywords: supramolecular structure; multiple hydrogen bonding; polymer electrolytes supramolecular structure; multiple hydrogen bonding; polymer electrolytes
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Wang, J.-H.; Cheng, C.-C.; Altukhov, O.; Chang, F.-C.; Kuo, S.-W. Supramolecular Functionalities Influence the Thermal Properties, Interactions and Conductivity Behavior of Poly(ethylene glycol)/LiAsF6 Blends. Polymers 2013, 5, 937-953.

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