膨胀石墨基复合相变材料的热稳定性研究

发布时间：2018-04-04 06:47

  本文选题：膨胀石墨　切入点：复合相变材料　出处：《化工新型材料》2017年02期

【摘要】：以膨胀石墨(EG)为载体材料,烷类(二十一烷、二十二烷)和脂肪酸类(正癸酸、硬脂酸)为相变材料,采用熔融共混法制备了不同类型膨胀石墨基复合相变材料,通过对其微观形貌、结构组成、热稳定性等表征测试,探究不同种类膨胀石墨基复合相变材料的热稳定性原理。结果表明,EG具有大量不同尺寸、结构和层次的微孔结构,是由10~50μm厚的石墨片叠合成的平行塌陷片层构成,具有良好的吸附性和稳定性,EG通过微孔束缚、氢键及表面极性等作用对相变材料进行物理吸附,使其热稳定性提高;随着EG含量的增加,烷类复合相变材料的热分解温度逐渐升高,分解速率减慢,脂肪酸类复合相变材料分解温度有所降低,分解速率减慢,但二者都在25~80℃间表现出良好的热循环稳定性,具有优良的热效率和热稳定性,满足中低温体系的温度调控要求。
[Abstract]:Using expanded graphite (EGG) as carrier material, alkanes (21 alkanes, 22 alkanes) and fatty acids (n-sebacic acid, stearic acid) as phase change materials, different types of expanded graphite-based composite phase change materials were prepared by melt blending method.The principle of thermal stability of different kinds of expanded graphite-based composite phase change materials was investigated by means of micromorphology, structure composition, thermal stability and so on.The results show that EG has a large number of micropore structures of different sizes, structures and layers, which is composed of 1050 渭 m thick graphite lamellar parallel collapse, and has good adsorption and stability through micropore binding.The thermal stability of phase change materials was enhanced by hydrogen bonding and surface polarity, and the thermal decomposition temperature of alkane composite phase change materials increased gradually and the decomposition rate slowed down with the increase of EG content.The decomposition temperature and decomposition rate of fatty acid composite phase change materials are decreased, but both of them exhibit good thermal cycling stability at 2580 鈩，

本文编号：1708830