Sains Malaysiana 48(7)(2019): 1433–1438

http://dx.doi.org/10.17576/jsm-2019-4807-12

New Approach on the Modification of Liquid Natural Rubber Production using Microwave Technique

(Pendekatan Baharu kepada Penghasilan Modifikasi Getah Asli Cecair menggunakan Teknik Gelombang Mikro)

MOHAMAD SHAHRUL FIZREE IDRIS¹, SITI FAIRUS M. YUSOFF^1,2* & WAN NUR AINI WAN MOKHTAR¹

¹School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Polymer Research Centre (PORCE), Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Received: 1 October 2018/Accepted: 24 April 2019

ABSTRACT

High-speed synthesis using microwave technique has attracted considerable intentions among researchers as it provides an efficient time of doing reactions. Modification of liquid natural rubber (LNR) via hydrogenation using of 2,4,6-trimethylbenzenesulfonylhydrazide (MSH) produced hydrogenated liquid natural rubber (HLNR). The results showed that microwave-assisted hydrogenation of LNR was experimentally found to give expected product in a short time (10–20 min). The structure of products was characterized by Fourier-transform infrared (FTIR) and the percentage of hydrogenation was determined from the 1H-NMR spectrum. The highest hydrogenation percentage of HLNR for hydrogenation of LNR by microwave heating were obtained; an LNR hydrogenation percentage of 41.18% at a MSH:LNR weight ratio of 1.5:1, a microwave power of 600 W and a reaction time of 20 min. Diimide molecules have been generated more quickly at microwave frequencies and yield HLNR in a shorter time compared to reflux heating method.

Keywords: Diimide; hydrogenation; liquid natural rubber (LNR); microwave

ABSTRAK

Sintesis berkelajuan tinggi menggunakan teknik gelombang mikro telah menarik minat para penyelidik oleh kerana kecekapan masa untuk tindak balas. Modifikasi getah asli cecair (LNR) melalui penghidrogenan menggunakan 2,4,6-trimetilbenzenasulfonilhidrazid (MSH) telah menghasilkan getah asli cecair terhidrogen (HLNR). Hasil kajian menunjukkan penghidrogenan LNR berbantu gelombang mikro mampu menghasilkan produk yang dijangka dalam masa yang singkat (10-20 min). Struktur produk telah dicirikan oleh transformasi Fourier inframerah (FTIR) dan peratus penghidrogenan telah ditentukan daripada spektrum 1H-NMR. Peratusan penghidrogenan tertinggi HLNR untuk penghidrogenan LNR melalui pemanasan gelombang mikro telah diperoleh; peratus penghidrogenan LNR sebanyak 41.18% pada nisbah berat MSH:LNR 1.5:1, kuasa gelombang mikro 600 W dan masa tindak balas ialah 20 min. Molekul diimida dijana lebih cepat pada frekuensi gelombang mikro dan menghasilkan HLNR dalam masa yang lebih singkat berbanding kaedah pemanasan refluks.

Kata kunci: Diimida; gelombang mikro; getah asli cecair (LNR); penghidrogenan

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*Corresponding author; email: sitifairus@ukm.edu.my