Malaysian Journal of Analytical Sciences Vol 19 No 1 (2015): 118 – 128

 

 

 

SYNTHESIS AND PHYSICOCHEMICAL STUDIES OF SUBERATES AS BIOLUBRICANT BASETOCK

 

(Sintesis dan Kajian Fiziko-Kimia bagi Suberat sebagai Minyak Asas Biopelincir)

 

Maratun Najiha Abu Tahari, Salma Samidin, Mohd Ambar Yarmo, Nadia Salih,  Jumat Salimon*

 

School of Chemical Sciences &Food Technology,

Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

 

*Corresponding author: jumat@ukm.edu.my

 

 

Abstract

Synthesis of biolubricant through chemically modified suberic acid (SA) with 3 different types of alcohols which are 1-octanol (Oc), 1-decanol (De) and 1-dodecanol (Do) was conducted with presence of 4% p-toluenesulfonic acid (PTSA) as a catalyst. Preparation, characterization and physico-chemical properties of three types diester (suberate) is discussed in this paper. The diester products were confirmed by NMR and FTIR spectroscopic analysis. Addition of alcohols at the side chains of diacid increases the molecular weight and chain length resulted in the increment of viscosity index (VI), oxidative stability (OT) and flash point (FP) of the diesters. The result showed that 1,8-dioctanyl suberate (DOS) exhibited the most favorable low temperature performance (PP -8.5°C) while 1,8-didodecanyl suberate (DDoS) exhibited higher OT (190°C) and higher FP (224°C) than the other diester oils. On the other hand, the highest VI around 197°C was obtained for 1,8-didecanyl suberate (DDS). These diester oils have a good potential in formulation of industrial biolubricants.

 

Keywords: biolubricant, diester suberic acid, chemically modified

 

Abstrak

Sintesis biopelincir melalui modifikasi kimia terhadap asid suberik (SA) dengan 3 jenis alkohol iaitu 1-oktanol (Oc), 1-dekanol (De) dan 1-dodekanol (Do) dilakukan dengan kehadiran 4% asid p-toluenasulfonik (PTSA) sebagai katalis. Penyediaan, pencirian dan sifat fisiko-kimia bagi tiga jenis diester (suberat) dibincangkan dalam manuskrip ini. Produk diester yang terhasil ditentusahkan melalui analisis spektroskopi NMR dan FTIR. Penambahan alkohol pada rantai sisi diasid meningkatkan berat molekul dan panjang rantai mengakibatkan peningkatan indeks kelikatan, kestabilan oksidatif dan takat kilat diester. Hasil kajian  menunjukkan bahawa 1,8-dioktanil suberat (DOS) mempamerkan prestasi bekerja pada suhu rendah yang baik (PP -8.5°C) dan 1,8-didodekanil suberat (DDoS) memperlihatkan OT yang lebih tinggi (190°C) dan FP yang lebih tinggi (224°C) berbanding minyak diester yang lain. Selain itu, 1,8-didekanil suberat (DDS) memiliki VI yang tertinggi iaitu 197°C. Semua minyak diester ini memiliki potensi yang baik dalam formulasi biopelincir industri.

 

Kata kunci: biopelincir, diester suberik asid, modifikasi kimia

 

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