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Thermal, Conductivity and Molecular Interaction Studies of Poly(ethylene oxide)/Poly(methyl acrylate) Solid Polymer Electrolytes
Author(s) -
Halim Suhaila Idayu Abdul,
Chan Chin Han,
Winie Tan
Publication year - 2017
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201600050
Subject(s) - lithium perchlorate , materials science , miscibility , differential scanning calorimetry , ethylene oxide , glass transition , amorphous solid , polymer chemistry , polymer blend , lithium (medication) , polymer , ionic conductivity , fourier transform infrared spectroscopy , oxide , chemical engineering , electrolyte , chemistry , copolymer , organic chemistry , composite material , medicine , physics , electrode , engineering , thermodynamics , endocrinology , metallurgy
Summary Solid polymer electrolytes of poly(ethylene oxide) (PEO) and poly(methyl acrylate) (PMA) with addition of lithium perchlorate (LiClO 4 ) were studied. Samples were prepared by solution casting method. An existence of single and compositional‐dependant glass transition temperature ( T g ) of PEO/PMA systems [studied by Differential scanning calorimetry (DSC)] shows miscibility of the binary PEO/PMA blends as well as when added with small of amount of LiClO 4 in the molten state and amorphous phase. The systems are miscible in molten state and amorphous phase at high salt content with PEO content in the blends is in excess. In this case, the T g s of the PEO/PMA blends increase slightly with increasing salt concentration suggesting the molecular interaction of salt with the polymers. Impedance spectroscopy (IS) studies reveal that PEO/PMA 80/20 blend (w/w) added with 0.12 of LiClO 4 ( Y S ) shows the highest conductivity ( σ DC = 1.43 × 10 −5 S cm −1 ) as compared to PEO/LiClO 4 system at the same salt concentration ( σ DC = 6.43 ×10 −6 S cm −1 ). Results of T g using DSC and molecular interaction from Fourier‐transform infrared (FTIR) spectra suggest that blend with PEO in excess, Li + ions coordinate with ether oxygen of PEO instead of carbonyl oxygen of PMA. Hence, the percolation pathway for these SPEs is lying in the amorphous region of the PEO phase.