1School of Chemistry & Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
2Synthesis and Application of Conducting Polymer Research Group, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Adv. Mater. Lett., 2016, 7 (6), pp 456-460
DOI: 10.5185/amlett.2016.6125
Publication Date (Web): May 30, 2016
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E-mail: sharil7240@salam.uitm.edu.my
In this study, polymer electrolytes derived from polymethyl methacrylate/50 % epoxidized natural rubber (PE) were successfully prepared. The effects of silicon dioxide (SiO2) (15 nm) and acid modified SiO2 (HCl-SiO2) (15 nm) on the film formation and ionic conductivity of polymer electrolytes were investigated. In samples preparation, SiO2 was used as received. Meanwhile, HCl-SiO2 was prepared by reacting SiO2 with 7 M of hydrochloric acid (HCl) solution. PE, PE filled with SiO2 (PE-SiO2) and PE filled with HCl-SiO2 (PE-HCl-SiO2) electrolytes were prepared by solvent casting method with tetrahydrofuran (THF) as solvent and lithium tetrafluoroborate (LiBF4) as doping salt. The smoothness surface, opacity and agglomeration of PE-HCl-SiO2 film were found in between PE and PE-SiO2. CHNS analysis shows that the percentage of hydrogen in HCl-SiO2 and SiO2 are 0.88 and 2.07 %, respectively. Fourier transform infra-red (FT-IR) analysis confirm that HCl-SiO2 has low number of silanol group (Si-OH) but high number of siloxane group (Si-O-Si) compared to SiO2. Field Emission Scanning Electron Microscopy (FESEM) analysis shows that HCl-SiO2 has smaller size of agglomeration and porosity compared to SiO2. Meanwhile, electrochemical impedance spectroscopy (EIS) analysis shows that the ionic conductivity of PE-HCl-SiO2 is higher than PE but slightly lower than PE-SiO2.
Silicon dioxide, silanol group, polymethyl methacrylate, epoxidized natural rubber, polymer electrolyte
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