以十二酸(LA)和十四酸(MA)为原料,采用熔融共混法制备了一种LA-MA二元共晶相变材料。利用步冷曲线确定了质量分数对LA-MA混合物结晶温度的影响,通过绘制混合体系相图获得共晶点,LA-MA二元混合物共晶体系的质量比为3:1,共晶温度为32.7℃,LA-MA二元共晶体系相变潜热为160.5J/g。傅里叶红外光谱测试表明,二元复合材料中LA和MA在分子作用力下相互结合,未发生化学反应。经过500次20～70℃冷热循环后,复合材料相变温度波动不大,稳定性好。热重分析表明,温度不超过100℃时未有明显的质量损失,LA-MA二元复合相变材料适用于墙体等建筑围护结构。
One kind of binary eutectic phase change material was prepared by melt blending method with lauric acid (LA) and myristic acid (MA).The effect of mass fraction on crystallization temperature of LA-MA mixture was conducted by step cooling curve method.The hypoeutectic point was obtained by drawing the phase diagram of the mixture system,where the mass ratio of LA to MA was 3:1 and the eutectic temperature was 32.7℃.The latent heat of the eutectic system was 160.5J/g.FT-IR experimental results shown that LA and MA were integrated under molecular force in the binary composite and no chemical reaction occurred.After 500 times of 20～70℃ thermocycling,the phase change temperature of the composite had little change,and it indicated that the stability of LA-MA mixture was good.TG tests shown that there was no obvious mass loss when the temperature was less than 100℃.LA-MA binary composite phase change material was suitable for wall and other building envelope.
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