Abstract:

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.

Key words: Capric acid; Myristic acid; Cooling curve; Phase diagram; Phase transition capability