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采用步冷曲线法测定了不同比例的十二酸(LA)/十六酸(PA)二元体系的相变温度,绘制了该体系的T-X相图。在其最低共熔点处引入十四酸(MA)组成三元体系,测定了该三元体系不同组成的相变温度,绘制其T-X相图。采用差式扫描量热仪(DSC)和红外光谱(FT-IR)对三元体系中最低共熔物的热性能和稳定性能进行表征。结果表明:LA/PA质量比为76∶24时形成最低共熔物,其最低共熔温度为31.7℃,相变焓为272.9J/g;LA/PA/MA三元体系在质量比为60.8∶19.2∶20时能形成低共熔物,其低共熔温度为26.9℃,相变焓为264.2J/g,连续相变过程无分层现象,300次热循环后热稳定性好。
The phase transition temperatures of different ratios of lauroic acid (LA) / hexadecanoic acid (PA) binary systems were determined by the step-cooling curve method. The T-X phase diagram of the system was plotted. At the lowest eutectic point, myristic acid (MA) was introduced into ternary system to determine the phase transition temperatures of different compositions of the ternary system, and the T-X phase diagram was drawn. The thermal properties and the stability of the lowest eutectic in the ternary system were characterized by differential scanning calorimetry (DSC) and infrared spectroscopy (FT-IR). The results show that the lowest eutectic temperature is obtained when the mass ratio of LA / PA is 76:24, the lowest eutectic temperature is 31.7 ℃ and the enthalpy of phase transition is 272.9J / g. The mass ratio of LA / PA / MA ternary system is 60.8 : 19.2:20 can form a eutectic, the eutectic temperature of 26.9 ℃, the enthalpy of phase transition 264.2J / g, continuous phase change without stratification, 300 thermal cycles after thermal stability.