采用熔融共混法制备了一种适用于0～3℃冷链物流领域的三元复合相变材料。首先以十二醇(LA)和十六醇(HA)为原料制备了不同配比的LA-HA二元混合体系,在LA-HA的最低共熔点体系中加入正辛酸(OA),形成LA-HA-OA三元体系。实验结果表明,LA与HA质量比为82∶18时形成二元共熔物,其共晶温度为16.6℃,未出现过冷现象;LA-HA与OA质量比为54∶46时形成三元复合相变材料,其相变温度为1.8℃,过冷度为1.3℃,相变潜热达到149.8J/g。红外光谱测试表明,二元和三元复合相变材料在分子力的作用下结合,并未发生化学反应。LA-HA-OA三元复合相变材料在经过100次-10～10℃热循环后,材料的相变温度的变化不大于0.2℃,未发生相分离现象,热稳定性良好,可应用于冷链物流领域。
A ternary composite phase change material(PCM) suitable for 0～3℃cold chain logistics was prepared by melt blending method.Binary composite of LA-HA with different mass ratios were prepared with lauryl alcohol (LA)and hexadecyl alcohol (HA).Thenoctanoic acid (OA) was added to the lowest eutectic composite of LA-HA to form LA-HA-OA ternary composite.The experimental results shown that the lowest eutectic was formed when the mass ratio of LA and HA was 82∶18.The eutectic temperature of LA-HA was 16.6℃ and has no subcolding phenomenon occurred.When the mass ratio of LA-HA to OA was54∶46,a ternary eutectic PCM was formed.The phase change temperature of the ternary eutectic composite was 1.8℃,the subcooling degree was 1.3℃,and the latent heat was 149.8J/g.Fourier Infrared Spectroscopy (FT-IR) shown that the binary and ternary composites were combined under the action of molecule force,and had no chemical reaction occurred.LA-HA-OA ternary composite PCM had no phase separation phenomenon,and the change of its phase change temperature was no more than 0.2℃ after 100 thermal cycles of between -10℃ and 10℃.It shown that the composite PCM had good thermal stability which can be used in the field of cold chain logistics system.
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基金资助
江苏省高校自然科学研究重大项目(16KJA480001);江苏省研究生实践创新计划项目(SJCX20-1093)
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