Saalah Sariah, Abdullah Luqman Chuah, Aung Min Min, Biak Dayang Radiah Awang, Basri Mahiran, Jusoh Emiliana Rose, Mamat Suhaini
Chemical Engineering Programme, Faculty of Engineering, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu 88400, Sabah, Malaysia.
epartment of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia.
Molecules. 2017 Mar 29;22(4):551. doi: 10.3390/molecules22040551.
A low cost, abundant, and renewable vegetable oil source has been gaining increasing attention due to its potential to be chemically modified to polyol and thence to become an alternative replacement for the petroleum-based polyol in polyurethane production. In this study, jatropha oil-based polyol (JOL) was synthesised from non-edible jatropha oil by a two steps process, namely epoxidation and oxirane ring opening. In the first step, the effect of the reaction temperature, the molar ratio of the oil double bond to formic acid, and the reaction time on the oxirane oxygen content (OOC) of the epoxidised jatropha oil (EJO) were investigated. It was found that 4.3% OOC could be achieved with a molar ratio of 1:0.6, a reaction temperature of 60 °C, and 4 h of reaction. Consequently, a series of polyols with hydroxyl numbers in the range of 138-217 mgKOH/g were produced by oxirane ring opening of EJOs, and the physicochemical and rheological properties were studied. Both the EJOs and the JOLs are liquid and have a number average molecular weight () in the range of 834 to 1457 g/mol and 1349 to 2129 g/mol, respectively. The JOLs exhibited Newtonian behaviour, with a low viscosity of 430-970 mPas. Finally, the JOL with a hydroxyl number of 161 mgKOH/g was further used to synthesise aqueous polyurethane dispersion, and the urethane formation was successfully monitored by Fourier Transform Infrared (FTIR).
一种低成本、储量丰富且可再生的植物油源因其可通过化学改性转化为多元醇，进而成为聚氨酯生产中基于石油的多元醇的替代物而受到越来越多的关注。在本研究中，从不可食用的麻风树油通过两步法合成了麻风树油基多元醇（JOL），即环氧化和环氧乙烷开环。第一步，研究了反应温度、油双键与甲酸的摩尔比以及反应时间对环氧化麻风树油（EJO）的环氧乙烷氧含量（OOC）的影响。结果发现，在摩尔比为1:0.6、反应温度为60℃和反应4小时的条件下，可实现4.3%的OOC。因此，通过EJO的环氧乙烷开环制备了一系列羟值在138 - 217 mgKOH/g范围内的多元醇，并对其物理化学和流变学性质进行了研究。EJO和JOL均为液体，数均分子量（）分别在834至1457 g/mol和1349至2129 g/mol范围内。JOL表现出牛顿流体行为，粘度低至430 - 970 mPas。最后，将羟值为161 mgKOH/g的JOL进一步用于合成水性聚氨酯分散体，并通过傅里叶变换红外光谱（FTIR）成功监测了聚氨酯的形成。
