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The aim of this study is to investigate the potential use of palm oil and to prepare new UV (ultraviolet) radiation‐curable acrylated polyester prepolymers, which could be used in the wood coating industry. Thus, palm oil‐based acrylated polyester resins PEPP‐1 (from refined, bleached, and deodorized palm oil) and PEPP‐2 (from crude palm oil) were synthesized at the Advanced Oleochemical Technology Centre (AOTC) laboratory of Palm Oil Research Institute of Malaysia (PORIM). The performances of these resins with respect to their curing rate and physical‐mechanical properties of cured products under UV radiation were studied. It can be concluded that newly synthesized UV radiation‐curable polyester acrylated prepolymers (palm oil based), namely PEPP‐1 and PEPP‐2, can be used as radiation curable coating materials for wood coating applications. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 2156–2163, 2001

Palm-based dihydroxystearic acid was purified by employing solvent crystallization using ethanol and ethanol/water mixture as solvents. Two different cooling modes, rapid and natural cooling, were employed for the crystallization process. In this study, the cooling effects on morphology, habit, particle size distribution, and yield of dihydroxystearic acid crystals were investigated. The dihydroxystearic acid crystals appeared to agglomerate into sphere-like and plate-like structures, depending on the cooling modes and the presence of water. By manipulating the solvent and cooling modes, the crystal yield ranged from 0.8% to 42.1%, while the crystal purity ranged from 73.3% to 91.4%. Solvent crystallization using ethanol was best achieved through natural cooling with the dihydroxystearic acid to ethanol ratio of 1.0:1.0, which produced the narrowest particle size distribution curve with the largest average particle size.

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