Malaysian Journal of Analytical Sciences Vol 21 No 4 (2017): 950 - 957

DOI: https://doi.org/10.17576/mjas-2017-2104-22

DODECYLBENZENE SULFONIC ACID CONCENTRATION EFFECT ON ELECTRICAL AND THERMAL PROPERTIES OF POLYANILINE

(Kesan Penumpuan Asid Sulfonik Dodekilbenzena ke atas Sifat Elektrik dan Termal Polianilin)

Nurul Akmil Mustaffa¹*, Qumrul Ahsan¹, Mohd Asyadi Azam¹, Luqman Chuah Abdullah²

¹Faculty of Manufacturing Engineering,

Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia

²Material Processing and Technology Laboratory, Institute of Advance Technology,

Universiti Putra Malaysia, 42400 UPM Serdang, Selangor, Malaysia

*Corresponding author: akmil.mustaffa@gmail.com

Received: 28 November 2016; Accepted: 5 February 2017

Abstract

Polyaniline (PANI) doped with various concentration of dedocylbenzene sulfonate acid (DBSA) were prepared by oxidative polymerization with presence of ammonium persulfate. Emerald green PANI powder obtained were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and carried out electrical conductivity test. In this research, the conductivity and thermal properties of PANI has been changed with the effect of doping. With increasing concentration of DBSA, the conductivity raises up to certain concentration (1.65 mmol of DBSA), afterwards with further increase of DBSA concentration, conductivity value declines and reaches to a value lower than that of pristine PANI. The similar trend is also observed for enthalpy values (ΔH) determined by DSC of pristine PANI and DBSA doped PANIs’ which may attribute the effect of concentration of DBSA on molecular arrangement in PANI. Results from polymeric structure obtained from FTIR clearly indicate the disruption in bond when PANI doped with DBSA and it may indicate that the DBSA changes molecule structure of PANI in term of segmented local structure of polymer.

Keywords: polyaniline, advanced material, dodecylbenzene sulfonate acid, conductivity, differential scanning calorimetry

Abstrak

Polianilin (PANI) didopkan dengan pelbagai kepekatan asid sulfonat dodekilbenzena (DBSA) telah disediakan dengan kaedah pempolimeran oksidatif dengan kehadiran ammonium persulfat. Serbuk hijau zamrud PANI yang diperolehi dicirikan oleh spektroskopi inframerah Fourier (FTIR), kalorimeter imbasan pembeza (DSC), dan ukuran kekonduksian. Dalam kajian ini, didapati bahawa kekonduksian haba dan sifat – sifat PANI telah ditukar sebagai kesan daripada pendopan. Dengan peningkatan kepekatan DBSA, kekonduksian juga meningkat sehingga kepekatan tertentu (1.65 mmol daripada DBSA). Kemudian, kekonduksian berkurangan dengan peningkatan kepekatan DBSA selanjutnya. Keputusan PANI daripada DSC, yang mengandungi nilai entalpi yang berbeza (ΔH) menunjukkan bahawa DBSA tidak mengubah struktur molekul PANI dari segi segmen struktur tempatan polimer dan ΔH juga menunjukkan ke arah kesan kepekatan DBSA pada susunan molekul dalam PANI.

Kata kunci: polianilin, bahan termaju, asid sulfonat dodekilbenzena, konduktiviti, kalorimeter imbasan pembeza

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