Sains Malaysiana 40(7)(2011): 691–694
Conductivity
and Structural Studies of Plasticized Polyacrylonitrile (PAN) – Lithium
Triflate Polymer Electrolyte Films
(Kekonduksian
dan Struktur Filem Elektrolit Polimer Poliakrilonitril (PAN)
– Litium Triflat yang Mengandungi Agen Pemplastik)
A.Ahmad, K.B. Md. Isa
& Z. Osman*
Physics
Department, University of Malaya, 50603 Kuala Lumpur, Malaysia
Diserahkan:
23 Oktober 2009 / Diterima: 20 September 2010
ABSTRACT
The
effect of different plasticizers on the properties of PAN–
polymer electrolytes has been studied. Propylene carbonate (PC)
and ethylene carbonate (EC) having different values of donor
numbers, dielectric constant and viscosity have been used as plasticizers. The
highest room temperature conductivity for the film in the PAN–
system was 3.04 × 10-4 S cm-1.
The highest room temperature conductivity for the films in the PAN–EC–
system and the PAN–PC–
system was 1.32 × 10-3 and 8.64 × 10-4 S
cm-1. The addition of plasticizers has been found to
enhance the conductivity of polymer electrolytes by increasing the amorphous
content as well as by dissociating the ion aggregates present in polymer
electrolyte. Conductivity temperature-dependence studies of these plasticized PAN-salt
systems were carried out in the temperature range of 303 to 373 K. The
conductivity versus temperature plots obeyed an Arrhenius type variation. The
structural and complex formations were studied by X-ray diffraction (XRD)
and Fourier Transform Infrared (FTIR) spectroscopy.
Keywords:
Conductivity; lithium triflate; plasticizer; polyacrylonitrile; polymer
electrolytes
ABSTRAK
Kesan
penggunaan agen pemplastik yang berbeza terhadap sifat elektrolit polimer PAN–
telah dikaji. Propilina karbonat (PC) and etilena karbonat (EC)
mempunyai bilangan penderma, pemalar dielektrik dan kelikatan yang berbeza
digunakan sebagai agen pemplastik. Nilai kekonduksian tertinggi pada suhu bilik
bagi filem dalam sistem PAN– adalah 3.04 × 10-4 S
cm-1. Nilai kekonduksian tertinggi pada suhu bilik bagi
filem dalam sistem PAN–EC–
dan sistem PAN–PC– adalah 1.32 × 10-3 dan
8.64 × 10-4 S cm-1. Penambahan agen pemplastik
didapati telah meningkatkan nilai kekoduksian elektrolit polimer melalui
peningkatan kandungan amorfus dan penguraian kelompok ion yang wujud. Kajian
kekonduksian terhadap suhu untuk sistem PAN-garam yang mengandungi agen
pemplastik dilakukan pada julat suhu daripada 303 hingga 353 K. Plot bagi
kekonduksian melawan suhu didapati mengikut Arrhenius. Struktur dan pembentukan
kompleks dikaji dengan menggunakan pembelauan sinar-X (XRD)
dan Spektroskopi Infra-merah (FTIR).
Kata kunci: Agen pemplastik;
elektrolit polimer; kekonduksian; litium triflat; poliakrilonitril
RUJUKAN
Baskaran,
R., Selvasekarapandian, S., Kuwata, N., Kawamura, J. & Hattori, T. 2006. AC
impedance, DSC and FT-IR investigations on (x) PVAc–(1 − x)
PVdF blends with LiClO4. Materials Chemistry and Physics 98:
55-61.
Berthier,
C., Gorecki, W., Minier, M., Armand, M.B., Chabagno, J.M. & Rigaud, P.
1983. Microscopic investigation of ionic conductivity in alkali metal
salts-poly(ethylene oxide) adducts. Solid State Ionics 11: 91-95.
Cowie,
J.M.G. 1987. In MacCallum, J.R. & Vincent, C.A. (ed.) Polymer
Electrolyte Reviews 1, 69-102. New York: Elsevier.
Forsyth,
M., Meakin, P. & MacFarlane, D.R. 1995. A 13C
NMR study of the role of plasticizers in the conduction mechanism of solid
polymer electrolytes. Electrochimica Acta 40: 2339-2342.
MacFarlane,
D.R., Sun, J., Meakin, P., Fasoulopoulos, P., Hey, J. & Forsyth, M. 1995.
Structure-property relationships in plasticized solid polymer electrolytes. Electrochimica
Acta 40: 2131-2136.
Michael,
M.S., Jacob, M.M.E., Prabaharan, S.R.S. & Radhakrishna. S. 1997. Enhanced
lithium ion transport in PEO-based solid polymer electrolytes employing a novel
class of plasticizers. Solid State Ionics 98: 167-174.
Rajendran,
S., Sivakumar, M. & Subadevi, R. 2004. Investigations on the effect of
various plasticizers in PVA–PMMA solid polymer blend electrolytes. Materials
Letters 58: 641-649.
Ramesh,
S. & Arof, A.K. 2001. Ionic conductivity studies of plasticized poly (vinyl
chloride) polymer electrolytes. Mat Sci Eng B 85: 11-15.
Ramya,
C.S., Selvasekarapandian, S., Savitha, T., Hirankumar, G. & Angelo, P.C.
2007. Vibrational and impedance spectroscopic study on PVP–NH4SCN
based polymer electrolytes. Physica B 393: 11-17.
Reich,
S. & Michaeli, I. 1975. Electrical conductivity of small ions in
polyacrylonitrile in the glass–transition region. J. Polym. Sci. B-Polym.
Phys. 13: 9-18.
Sawai,
D., Miyamoto, M., Kanamoto, T. & Ito, M. 2000. Lamellar thickening in
nascent poly(acrylonitrile) upon annealing. J. Polym. Sci. Part B-Polym.
Phys. 38: 2571-2579.
Souquet,
J.L., Levy, M. & Duclot, M. 1994. A single microscopic approach for ionic
transport in glassy and polymer electrolytes. Solid State Ionics 70-71:
337-345.
Zhang,
Z., Zhang, L., Wang, S., Chen, W. & Lei, Y. 2000. A convenient route to
polyacrylonitrile/silver nanoparticle composite by simultaneous
polymerization–reduction approach. Polymer 42: 8315-8318.
*Pengarang
untuk surat menyurat; email: zurinaosman@um.edu.my
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