Title: Synthesis of EB-curable hyperbranched urethane acrylate from palm oil oleic acid

Authors: Mek Zah Salleh; Khairiah Badri; Mohd Hilmi Mahmood

Addresses: Faculty of Science and Technology, School of Chemical Sciences and Food Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia; Radiation Technology Division, Malaysian Nuclear Agency, 43000 Kajang, Selangor, Malaysia ' Faculty of Science and Technology, Polymer Research Center (PORCE), School of Chemical Sciences and Food Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia ' Radiation Technology Division, Malaysian Nuclear Agency, 43000 Kajang, Selangor, Malaysia

Abstract: Hyperbranched urethane acrylate (HBPUA) from oleic acid of palm oil has been synthesised by a three-step reaction. Dipentaerythritol was initially reacted with 2, 2-bis (hydroxymethyl) propionic acid in a solution medium aided by p-toluene sulfonic acid as the catalyst. This mixture was then used as the core (HBP) and reacted with palm oil oleic acid to form the hyperbranched polyol (HBP-1). The hyperbranched polyurethane acrylate (HBPUA) was prepared by reacting HBP-1 resin with diisocyanate and hydroxyl-containing acrylate monomer in the presence of 0.1-2 wt% dibutyltin dilaurate as a catalyst. The reaction was confirmed by several analyses, i.e., determination of hydroxyl value (OHV), Fourier transform infrared (FTIR) spectroscopy, gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy analyses. HBPUA was found curable when subjected to electron beam (EB) irradiation. The thermal stability of EB cured films of HBPUAs was determined by hermogravimetric analyser (TGA). The thermal decomposition of HBPUAs showed good thermal stability up to 450°

Keywords: hyperbranched polymers; palm oil; oleic acid; electron beam irradiation; thermal stability; EB cured films; radiation; urethane acrylate.

DOI: 10.1504/IJMATEI.2013.052811

International Journal of Materials Engineering Innovation, 2013 Vol.4 No.1, pp.65 - 78

Received: 01 Apr 2012
Accepted: 04 Oct 2012
Published online: 19 Jul 2014 *

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