摘要
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 160.5 J/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.
作者
徐沣
孙志高
Xu Feng;Sun Zhigao(School of Environment Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009)
出处
《化工新型材料》
CAS
CSCD
北大核心
2021年第11期156-159,165,共5页
New Chemical Materials
基金
江苏省高校自然科学研究重大项目(16KJA480001)
苏州市住建局科技计划项目(2020-006)。
关键词
十二酸
十四酸
复合相变材料
相变潜热
热稳定性
lauric acid
myristic acid
phase change material
latent heat
thermal stability
