Malaysian Journal of Analytical Sciences Vol 18 No 2 (2014): 376 – 384

 

 

 

CARBOXYMETHYL CELLULOSE FROM KENAF REINFORCED COMPOSITE POLYMER ELECTROLYTES BASED 49% POLY(METHYL METHACRYLATE)-GRAFTED NATURAL RUBBER

 

(Komposit Polimer Elektrolit Berasaskan 49% Poli(metil metakrilat)-cangkukan Getah Asli Diperkuat Karboksimetil Selulosa Daripada Kenaf)

 

Serawati Jafirin¹, Ishak Ahmad^1,2*,  Azizan Ahmad^1,2

 

¹School of Chemical Sciences and Food Technology,

²Polymer Research Centre (PORCE),

Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor Darul Ehsan, Malaysia

 

*Corresponding author: gading@ukm.edu.my

 

 

Abstract

Composite polymer electrolytes based 49% poly(methyl methacrylate)-grafted natural rubber (MG49) incorporating lithium triflate (LiCF₃SO₃) were prepared. The study mainly focuses on the ionic conductivity performances and mechanical properties. Prior to that, carboxymethyl cellulose was synthesized from kenaf fiber. The films were characterized by electrochemical impedance (EIS) spectroscopy, linear sweep voltammetry (LSV), universal testing machine and scanning electron microscopy (SEM). The conductivity was found to increase with carboxymethyl cellulose loading. The highest conductivity value achieved was 6.5 × 10^-6 Scm^-1 upon addition of 6 wt% carboxymethyl cellulose. LSV graph shows the stability of this film was extended to 2.7 V at room temperature. The composition with 6 wt% carboxymethyl cellulose composition showed the highest tensile strength value of 7.9 MPa and 273 MPa of Young’s modulus. The morphology of the electrolytes showed a smooth surface of films after addition of salt and filler indicating amorphous phase in electrolytes system. Excellent mechanical properties and good ionic conductivity are obtained, enlightening that the film is suitable for future applications as thin solid polymer electrolytes in lithium batteries.

 

Keywords: carboxymethyl cellulose, ionic conductivity, mechanical properties, polymer electrolytes

 

Abstrak

Komposit polimer elekrolit berasaskan 49% poli(metil metakrilat)-cangkukan getah asli (MG49) dengan penambahan garam triflat (LiCF₃SO₃) telah disediakan. Kajian ini lebih menumpukan kepada ciri-ciri kekonduksian ion dan kekuaan sifat mekanik sistem elektolit yang dihasilkan. Sebelum itu, karboksimetil selulosa daripada kenaf disediakan terlebih dahulu. Filem yang dihasilkan dicirikan menggunakan spekroskopi impedans (EIS), voltametri sapuan linear (LSV), mesin pengujian universal dan mikroskopi imbasan elektron (SEM). Nilai kekonduksian ion didapati meningkat dengan penambahan karboksimetil selulosa. Kekonduksian ion tertinggi diperolehi dengan nilai 6 ×10^-6 Scm^-1 pada penambahan 6 bt% karboksimetil selulosa. Graf LSV menunjukkan kestabilan filem yang dihasilkan mencapai sehingga 2.7 V pada suhu bilik. 6 bt.% karboksimetil selulosa menunjukkan 7.9 MPa kekuatan regangan dan 273 MPa modulus young. Morpologi permukaan elektrolit mempamerkan permukaan lebih licin selepas penambahan garam dan pengisi yang menunjukkan kawasan amorfus pada sistem elektrolit. Kekuatan regangan dan kekonduksian ion memberansangkan yang diperolehi menunjukkan filem yang dihasilkan sesuai digunakan sebagai filem pepejal elektrolit polimer dalam bateri litium.

 

Kata kunci: karboksimetil selulosa, kekonduksian ion, sifat mekanik, polimer elektrolit

 

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