Sains Malaysiana 40(1)(2011): 49–54

 

Polymer Gel Electrolytes Based on 49% Methyl-Grafted Natural Rubber

(Elektrolit Gel Polimer Berasaskan 49% Metil Cangkukan Getah Asli)

 

A.S. Kamisan1, T.I.T. Kudin1, A.M.M. Ali1 & M.Z.A. Yahya1,2,*

 

1Ionic Materials & Devices (iMADE) Research Laboratory

Faculty of Applied Sciences, Universiti Teknologi MARA

40450 Shah Alam, Selangor D.E., Malaysia

 

2Institute of Sciences, Universiti Teknologi MARA

40450 Shah Alam, Selangor D.E., Malaysia

 

Diserahkan: 7 Disember 2009 / Diterima: 16 Julai 2010

 

ABSTRACT

 

Polymer gel electrolytes (PGEs) based on 49% methyl-grafted natural rubber (MG49) were first prepared by dissolving ammonium triflate (NH4CF3SO3) in propylene carbonate (PC) by various molar concentrations of NH4CF3SO3 to obtain liquid electrolytes and were characterized by AC electrical impedance spectroscopy (EIS) measurements to study their conducting behaviour. The liquid electrolyte with optimum conductivity (0.7M) was then gelled with MG49 and their conductivity was also studied. The highest conductivity of liquid electrolyte was 3.6×10-3 Scm-1 and 2.9×10-2 Scm-1 for PGEs. The molecular interactions between components of NH4CF3SO3, PC, and MG49 have been observed by ATR-FTIR spectroscopy study. The downshifting of C=O stretching frequency of PC from 1785 cm-1 to 1780 cm-1 and NH4+ band from 1634 cm-1 to 1626 cm-1 that has been obtained by spectroscopic data in addition of NH4CF3SO3 confirmed the complexation occurrence. Interaction between NH4CF3SO3 and MG49 has also been investigated. This study is focused on the interactions between components in the PGE system and relates them with their conducting behavior.

 

Keywords: Ammonium triflate; complexation; conductivity; MG49; polymer gel electrolyte

 

ABSTRAK

 

Elektrolit gel polimer berasaskan 49% metil cangkukan getah asli (MG49) disediakan dengan melarutkan ammonium triflat (NH4CF3SO3) dalam propilena karbonat (PC) dengan pelbagai kepekatan molar bagi menghasilkan elektrolit cecair dan sifat kekonduksiannya diuji menggunakan alat spektroskopi impedans elektrik arus ulang-alik. Elektrolit cecair dengan kekonduksian optimum (0.7M) kemudian digel bersama MG49 dan ciri kekonduksiannya juga dikaji. Nilai kekonduksian paling tinggi bagi elektrolit cecair ialah 3.6×10-3 Scm-1 dan 2.9×10-2 Scm-1 bagi elektrolit gel polimer. Interaksi molekul antara komponen NH4CF3SO3, PC, dan MG49 diperhatikan melalui kajian spektroskopi ATR-FTIR. Anjakan frekuensi regangan C=O PC daripada 1785 cm-1 ke 1780 cm-1 dan jalur NH4+ daripada 1634 cm-1 ke 1626 cm-1 dengan penambahan NH4CF3SO3 yang diperoleh daripada data spektroskopik mengesahkan berlakunya kompleks antara PC dan NH4CF3SO3. Interaksi antara NH4CF3SO3 dan MG49 juga turut dikaji. Kajian ini memfokus pada interaksi antara komponen-komponen dalam sistem elektrolit gel polimer dan mengaitkan dengan sifat-sifat kekonduksiannya.

 

Kata kunci: Ammonium triflat; elektrolit gel polimer; kekonduksian; kompleks; MG49

 

RUJUKAN

 

Ali, A.M.M., Subban, R.H.Y., Bahron, H., Winie, T., Latif, F. & Yahya, M.Z.A. 2008. Grafted natural rubber-based polymer electrolytes: ATR-FTIR and conductivity studies. Ionics 14: 491-500.

Ali, A.M.M., Yahya, M.Z.A., Bahron, H. & Subban, R.H.Y. 2006. Electrochemical studies on polymer electrolytes based on poly(methyl methacrylate)-grafted natural rubber for lithium polymer battery. Ionics 12: 303-307.

Armand, M.B., Chabagno, J.M. & Duclot, M. 20-22 September,1978. Poly-esters as solid electrolytes. Extended Abstract, Second International Meeting on Solid Electrolytes, St. Andrews, Scotland.

Battisti, D., Nazri, G.A., Klassan, B. & Arroca, R. 1993. Vibrational studies of lithium perchlorate in propylene carbonate solutions. Journal of Physical Chemistry 97: 5826-5830.

Chandra, S., Sekhon, S.S. & Narinder Arora. 2000. PMMA based protonic polymer gel electrolytes. Ionics 6: 112-118.

Deepa, M., Agnihotry, S.A., Gupta, D. & Chandra, R. 2004. Ion-pairing effects and ion-solvent-polymer interactions in lin(CF 3SO2)2-PC-PMMA electrolytes: A FTIR study. Electrochimica Acta 49: 373-383.

Deepa, M., Sharma, N., Agnihotry, S.A. & Chandra, R. 2002. FTIR Investigations on Ion-ion Interactions in Liquid and Gel Polymeric Electrolytes: LiCF3SO3-PC-PMMA. Journal of Materials Science 37: 1759-1765.

Fenton, D.E., Parker, J.M. & Wright, P.V. 1973. Complexes of Alkali Metal Ions with Poly(ethylene oxide). Polymer 14: 589

Frech, R. & Chintapalli, S. 1996. Effect of Propylene Carbonate as a Plasticizer in High Molecular Weight PEO-LiCF3SO3 Electrolytes. Solid State Ionics 85: 61-66.

Glasse, M.D., Idris, R., Latham, R.J., Linford, R.G. & Schlindwein, W.S. 2002. Polymer Electrolytes Based on Modified Natural Rubber. Journal of. Power Sources 147: 289-294.

Idris, R., Glasse, M.D., Latham, R.J., Linford, R.G. & Schlindwein, W.S. 2001. Polymer Electrolytes Based on Modified Natural Rubber for Use in Rechargeable Lithium Batteries . Journal of Power Sources 94: 206-211.

Kumutha, K. & Alias, Y. 2006. FTIR Spectra of Plasticized Grafted Natural Rubber-LiCF3SO3 Electrolytes. Spectrochimica Acta- Part A: Molecular and Biomolecular Spectroscopy 64: 442-447.

Mohamed, S.N., Johari, N.A., Ali, A.M.M., Harun, M.K. & Yahya, M.Z.A. 2008. Electrochemical Studies on Epoxidised Natural Rubber-Based Gel Polymer Electrolytes for Lithium-Air Cells. Journal of Power Sources 183: 351-358.

Starkey, S.R. & Frech, R. 1997. Plasticizer Interactions with Polymer and Salt in Propylene Carbonate-Poly(acrylonitrile)-Lithium Triflate. Electrochimica. Acta 42: 471-474.

Winie, T. & Arof, A.K. 2006. FT-IR Studies on Interactions Among Components in Hexanoyl Chitosan-Based Polymer Electrolytes. Spectrochimica. Acta- Part A: Molecular and Biomolecular Spectroscopy 63: 677-684.

 

*Pengarang untuk surat-menyurat; email: mzay@salam.uitm.edu.my

 

 

 

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