癸酸-十四烷酸二元体系的相变性能

以癸酸(CA)-十四烷酸(MA)二元体系的理论预测相图为指导, 测量了该体系不同组成超声波混合后的步冷曲线, 绘制了该体系的实验相图, 判断出最低共熔温度与组成范围; 采用DSC测试最低共熔组成的相变性能, 采用IR检测最低共熔组成300次热循环前后的波形变化. 实验结果表明, CA-MA二元体系最低共熔组成范围为(76%~82%)CA+(24%~18%)MA, 最低共熔温度为294.45 K, 最大过冷度为274.75 K, 相变过程中无分层现象; DSC和IR的测试结果表明, 组成为78%CA+22%MA的相变焓为149.02 J/g, 开始相变温度为292.80 K, 热稳定性好.

Phase Transition Capability of the Binary System Capric Acid-Myristic Acid

Cooling-curves of different composition after ultrasonic blend were measured with the guide of theory forecast results of the binary system of capric acid and myristic acid. The experiment phase diagram was protracted, eutectic temperature and composition range were discovered of the binary system. Phase change properties of eutectic composition were tested with DSC, the change of the wave shape of eutectic composition after 300 thermocycling was tested with IR. The experiment results showed that the eutectic composition range in the binary system CA-MA is (76%—82%)CA+(24%—18%)MA, the eutectic temperature is 294.45 K, the maximal supercooling degree is 274.75 K and the delaminating phenomena not appeared in the phase change process. The test results showed the phase transition enthalpy is 149.02 J/g, the onset temperature of phase change is 292.80 K and thermal stability is fine of 78%CA+22%MA composition.