石蜡/硅藻土定型相变材料的结构和热性能  

Structure and Thermal Performances of Paraffin/Diatomite Form-stable Phase Change Materials

作　　者：赵思勰 晏华[1] 李云涛[1] 汪宏涛[1] 胡志德[1] ZHAO Sixie YAN Hua LI Yuntao WANG Hongtao HU Zhide(Department of Chemistry and Material Engineering, Logistic Engineering University, Chongqing 401311, China)

机构地区：[1]后勤工程学院化学与材料工程系,重庆401311

出　　处：《材料研究学报》2017年第7期502-510,共9页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51272283)~~

摘　　要：以硅藻土为载体、以石蜡为相变材料,用溶剂蒸发法制备出石蜡/硅藻土定型相变材料(PA/D-PCMs),使用SEM、FT-IR、TGA、DSC等手段对其微观结构和热性能进行了表征。结果表明:硅藻土对石蜡的毛细管力及两者之间形成的氢键能阻碍液态石蜡的渗出,使PA/D-PCMs具有很高的热稳定性,硅藻土的二级孔洞限制了部分石蜡的结晶。硅藻土内部有许多互相连通的导热通道,增强了石蜡的导热效果并提高了蓄放热速率。随着石蜡含量的增大PA/D-PCMs的X、Y和Z轴传热通道上声子的散射作用更剧烈,使其导热系数降低,但是具有更高的结晶度和相变潜热。为了保证PA/D-PCMs的结构稳定和良好的热性能,石蜡的最佳质量分数为45%。The paraffin/diatomite form-stable phase change materials（PA/D-PCMs） was prepared by using solvent evaporation, diatomite as carrier and paraffin as phase change materials. The microstructure and thermal properties of PA/D-PCMs were characterized by SEM、FT-IR、DSC and TGA respectively. The results show that： Leakage of melting paraffin was hindered through both the hydrogen bonding and the capillary force of the pores of diatomite, hence PA/D-PCMs put up excellent thermal stability. At the same time, secondary pores of diatomite can restrict partial paraffin crystallization, crystallinity of which would be affected. In interior of diatomite there were a few conduction channels with intercommunication, which can enhance thermal conductivity of paraffin and accelerate paraffin heat storage and release. With increase of the paraffin content phonon scattering effect would become more fierce in X, Y and Z axis thermal conduction channel of PA/D-PCMs, so thermal conductivity of PA/D-PCMs diminish,but owning higher latent heat and crystallinity. In order to ensure PA/D-PCMs structure stable and have good thermal properties simultaneously, optimal paraffin fraction in the composite is 45%.

关 键 词：材料学 硅藻土 石蜡/硅藻土定型相变材料 微观结构 结晶度 热性能 

分 类 号：TQ314[化学工程—高聚物工业]