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