Various plasticizers have been used in polymer electrolyte systems, mainly to enhance the ionic conductivity of the electrolyte. Therefore, in this study, the effects of dimethyl carbonates, DMC plasticizer on the ionic conductivity of poly (methyl methacrylate), PMMA electrolyte film when blended with 50% epoxidized natural rubber and ENR 50 were investigated. Unfortunately, the addition of DMC plasticizer reduced the ionic conductivity of this blend system at any amounts of plasticizer added. In addition, this DMC-plasticized system also exhibited higher activation energy than the unplasticized system. The effects of DMC plasticizer on the conductivity of this electrolyte system were investigated and explained using Field Emissions Scanning Electron Microscope, FESEM and Fourier Transform Infra Red, FTIR Spectrophotometer analyses. From these analyses, it can be concluded that the dielectric constant of a plasticizer is important when dealing with an electrolyte system containing rubber.
 S. A. M. Noor, A. Ahmad, I. A. Talib and M. Y. A. Rahman, “Morphology, Chemical Interaction, and Conductivity of a PEO-ENR50 Based on Solid Polymer Electrolyte,” Ionics, Vol. 16, No. 2, 2010, pp. 161-170.
 S. Boor, M. S. Hundal, G. G. Park, J. S. Park, W. Y. Lee, C. S. Kim, K. Yamada and S. S. Sekhon, “Non-Aqueous Polymer Electrolytes Containing Room Temperature Ionic Liquid: 2,3-Dimethyl-1-octylimidazolium Tetrafluoroborate,” Solid State Ionics, Vol. 178, No. 23-24, 2007, pp. 1404-1410. http://dx.doi.org/10.1016/j.ssi.2007.08.001
 Y. K. Yarovoy, H. P. Wang and S. L. Wunder, “Dynamic Mechanical Spectroscopy and Conductivity Studies of Gel Electrolytes Based on Stereocomplexed Poly(methyl methacrylate),” Solid State Ionics, Vol. 118, No. 3-4, 1999, pp. 301-310.
 S. S. Sekhon, N. Arora and S. Chandra, “Proton Conducting Polymer Gel Electrolytes with NO2 Substituted Carboxylic Acids,” European Polymer Journal, Vol. 39, No. 5, 2003, pp. 915-920.
 L. Famiza, A. Madzlan, A. A. M. Malik and M. Z. A. Yahya, “The Coagulation Impact of 50% Epoxidised Natural Rubber Chain in Ethylene Carbonate-Plasticized Solid Electrolyte,” Macromolecular Symposia, Vol. 277, No. 1, 2009, pp. 62-68.
 L. Famiza, A. Madzlan, K. Nasir, A. A. M. Malik and M. Z. A. Yahya, “The Role and Impact of Rubber in Poly(methyl methacrylate)/lithium Triflate Electrolyte,” Journal of Power Sources, Vol. 159, No. 2, 2006, pp. 1401-1404.
 G. B. Appetecchi, F. Croce and B. Scrosati, “Kinetics and Stability of the Lithium Electrode in Poly(methyl methacrylate)-Based Gel Electrolytes,” Electrochimica Acta, Vol. 40, No. 8, 1995, pp. 991-997.
 K. M. Abraham and M. Alamgir, “Li+ Conductive Solid Polymer Electrolytes with Liquid-Like Conductivity,” Journal of Electrochemical Society, Vol. 137, No. 5, 1990, pp. 1657-1658. http://dx.doi.org/10.1149/1.2086749
 X. Hou and K. S. Siow, “Novel Interpenetrating Polymer Network Electrolytes,” Polymer, Vol. 42, No. 9, 2001, pp. 4181-4188.