Effects of Acid Modified SiO₂ on Ionic Conductivity and Blend Properties of LiBF₄ Doped PMMA/ENR 50 Electrolytes

Abstract:

Previously, it was found that the addition of SiO₂ filler can improve the homogeneity and enhance the ionic conductivity of lithium tetrafluoroborate (LiBF₄) doped polymethyl methacrylate/50 % epoxidized natural rubber (PMMA/ENR 50) blend from 6.21 x 10^-7 Scm^-1 to 5.26 x 10^-6 Scm^-1. Unfortunately, this SiO₂ filler tend to agglomerates thus obstructing the smoothness in the transportation of lithium ion in the polymer blend matrix. This unruly phenomenon was due to the formation of hydrogen bonding between the oxygen atom of SiO₂ and the hydrogen atom from the moisture. Therefore, in this study, this SiO₂ filler was modified using hydrochloric acid (HCl) to reduce the formation of hydrogen bonding between SiO₂ and moisture. It was found that the modification was able to reduce the hydrogen bond in SiO₂ filler. The CHNS analysis shows that the percentage of hydrogen reduces as concentration of acid increased. This was further confirmed from the FT-IR analysis in which the peak corresponding to Si-OH was reduces meanwhile the peaks corresponding to Si-O-Si increases as HCl concentration increased. As a result, the homogeneity of the blends was further improved. However, the ionic conductivity of the system was found slightly reduce by few magnitudes. Temperature dependence ionic conductivity of LiBF₄ doped PMMA/ENR 50 filled HCl-SiO₂ electrolytes shows nonlinear trend indicates that the system not obeys Arrhenius equation.

• Periodical: Advanced Materials Research (Volume 1107)
• Pages: 187-193
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1107.187
• Online since: June 2015
• Authors: Mohamad Zamri Sharil Fadli*, Abdul Latiff Famiza
• Keywords: ENR 50, PMMA, Polymer Blend, Polymer Electrolyte, SiO₂

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