CONDUCTIVITY AND DIELECTRIC BEHAVIOR OF PLiAMPS-BASED SEMI-IPN SINGLE ION CONDUCTOR PLASTICIZED WITH POLY(SILOXANE-G-ETHYLENE OXIDE)

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摘要：

Comb poly(siloxane-g-ethylene oxide) (PSi-PE) with high chain segmental mobility, as a plasticizer, was introduced into poly(lithium 2-acrylamido-2-methyl-1-propanesulfonate) (PLiAMPS)-based semi-interpenetrating polymer network single-ion conductors. The structures of PSi-PE and PLiAMPS were characterized by FTIR spectroscopy. The distribution of PSi-PE in polyelectrolyte matrix was investigated through observing the residual surface morphology of conductor membrane after being etched by toluene. AC impedance and dielectric behavior measurements were used to investigate the impact of PSi-PE on the ionic conductivity and to analyze the mechanism of conductivity variation. Compared with the unplasticized membranes, the ionic conductivity of the membrane with the addition of 35 wt.% PSi-PE was improved by 20 times. Meanwhile, the dielectric constant (ε) of the membrane was increased to 1330 and the relaxation time was decreased to 0.012 s. The changes of dielectric properties reflect directly the effect of PSi-PE on the dissociation ability ofLi+and the chain segmental mobility, which well explains the reasons of ionic conductivity variation.

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关键词：

Experimental/ dielectric relaxation dissociation electric impedance etching Fourier transform spectra membranes permittivity polymer blends polymer electrolytes polymer structure surface morphology/ Li + dissociation ability relaxation time dielectric constant PSi-PE addition unplasticized membranes conductivity variation mechanism ionic conductivity dielectric behavior measurement AC impedance measurement toluene etching conductor membrane residual surface morphology polyelectrolyte matrix PSi-PE distribution Fourier transform infrared spectra FTIR spectra single ion conductors PLiAMPS-based semiinterpenetrating polymer network poly(lithium 2-acrylamido-2-methyl-1-propanesulfonate) plasticizer high chain segmental mobility comb poly(siloxane-g-ethylene oxide) PLiAMPS-based semi-ipn single ion conductor/ A6630H Self-diffusion and ionic conduction in solid nonmetals A6140K Structure of polymers, elastomers, and plastics A8245 Electrochemistry and electrophoresis A6820 Solid sur