Sains Malaysiana 39(1)(2010): 65–71

 

Elektrolit Pepejal Polimer 49% Poli (Metil Metakrilat) Cangkukan

Getah Asli - Litium Tetrafluoroborat

(Solid Polymer Electrolyte 49% Poly(Methly Methacrylate)-Grafted

Natural Rubber-Lithium Tetrafluoroborate)

 

Azizan Ahmad*, Pow CheeLien & Mohd Sukor Su'ait

Pusat Pengajian Sains Kimia dan Teknologi Makanan

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor D.E., Malaysia

 

Received: 16 February 2009 / Accepted: 19 June 2009

 

ABSTRAK

 

Potensi 49% poli(metil metakrilat) cangkukan getah asli (MG49) sebagai elektrolit pepejal polimer untuk diaplikasi dalam sistem peranti elektrokimia telah dikaji. Filem MG49 dengan garam LiBF4 sebagai dopan disediakan dengan menggunakan teknik pengacuan larutan. Kekonduksian ion yang diuji dengan menggunakan alat spektroskopi impedans elektrokimia menunjukkan kekonduksian optimum pada penambahan 25% bt garam LiBF4, dengan nilai kekonduksian ion, 1.49¥10-9 S.cm-1 pada suhu bilik. Pemerhatian struktur dan morfologi dijalankan dengan menggunakan analisis pembelauan sinar-X dan mikroskopi imbasan elektron. Hasil menunjukkan pengkompleksan dan penghabluran berlaku dalam sistem polimer elektrolit. Hal ini menyebabkan nilai kekonduksian elektrik yang rendah didapati walaupun telah mencapai tahap optimum penambahan garam LiBF4.

 

Kata kunci: 49% poli(metil metakrilat) cangkukan getah asli; litium tetrafluoroborate; elektrolit pepejal polimer

 

ABSTRACT

 

The potential of 49% poly(methyl methacrylate) grafted natural rubber (MG49) as a solid polymer electrolyte film for application in electrochemical device system has been investigated. The MG49 films with LiBF4 as a doping salt were prepared by solution casting technique. The ionic conductivity investigated by electrochemical impedance spectroscopy showed the optimum ionic conductivity was given by 25 wt% of LiBF4 salt loading with ionic conductivity value, 1.49¥10-9 S.cm-1 at room temperature. The observation on structural and morphology studies have been done by X-ray diffraction and scanning electron microscopy. Results showed that complexation and crystallization occurred in polymer electrolyte system. This gave low electrical conductivity value eventhough the addition of LiBF4 salt has reached the optimum level.

Keywords: 49% poly(methyl methacrylate)–grafted natural rubber (MG49); lithium tetrafluoroborate; solid polymer electrolyte

 

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*Corresponding author; email: azizan@ukm.my