Journal
NANOSCALE RESEARCH LETTERS
Volume 9, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1186/1556-276X-9-674
Keywords
Ion-conductive polymers; Epoxy resin; Lithium perchlorate; Glass transition temperature; Electrical and dielectric characteristics
Funding
- project 'Nanostructured multiphase polymer systems for electroactive materials' carrying out in the frame of Target programme of fundamental investigations of NASU 'Fundamental problems of nanostructured systems, nanomaterials, nanotechnologies'
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In the present work, ion-conductive hybrid organic-inorganic polymers based on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol (DEG) and lithium perchlorate (LiClO4) were synthesized. The effect of LiClO4 content on the electrophysical properties of epoxy polymers has been studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS). The effect of LiClO4 content on the structure has been studied by wide-angle X-ray scattering (WAXS). It was found that LiClO4 impacts on the structure of the synthesized hybrid epoxy polymers, probably, by formation of coordinative complexes {ether oxygen-lithium cations-ether oxygen} as evidenced from a significant increase in their glass transition temperatures with increasing LiClO4 concentration and WAXS studies. The presence of ether oxygen in DEG macromolecules provides a transfer mechanism of the lithium cations with the ether oxygen similar to polyethylene oxide (PEO). Thus, the obtained hybrid polymers have high values of ionic conductivity sigma' (approximately 10(-3) S/cm) and permittivity epsilon' (6 x 10(5)) at elevated temperatures (200 degrees C). On the other hand, DEG has higher heat resistance compared to PEO that makes these systems perspective as solid polymer electrolytes able to operate at high temperature.
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