Preparation And Properties Of Organic/Inorganic Phase Change Composite Materials

The organic/inorganic composite phase change thermal storage materials have several interesting properties such as stable temperature, large heat fusion and stable performance. The reserves of phase change materials are abundance and the energy of the world are lack, so the research of phase change materials are important. As one kind of organic/inorganic composite phase change materials, organic/layered silicate composite phase change materials is becoming a research hot spot in recent years.By using CTAB carries on the organic modification to the bentonite, the level spacing becomes from 1.452nm to1.982nm after the modification. With the intercalation of fatty acids, paraffin and polyalcohols into the modified bentonite, organic / inorganic composite phase change thermal storage materials were prepared. The structure and thermal properties of these phase change materials were analysized and determined by XRD, FTIR and DSC techniques.CA, SA and CA-SA/bentonite composite phase change thermal storage materials were prepared by intercalation method. The phase transition temperature of these three phase change thermal storage materials are 30.12℃,59.64℃,20.2℃respectively,their phase transition enthalpy is 58.43J/g,69.92J/g,66.4J/g respectively. Paraffin/bentonite composite phase change thermal storage material was also made by intercalation method. Its phase transition temperature is 60℃,phase transition enthalpy is 92J/g. NPG, TAM, NPG-TAM/bentonite composite phase change thermal storage materials were prepared by the same method. The phase transition temperature of these three phase change thermal storage materials are 56.14℃,117.8℃,39.8℃respectively,their phase transition enthalpy is 86.18J/g,198.6J/g,67.3J/g respectively.The experimental results show that the new phase change composite materials overcome the problem of plastic and liquefied crystal, and have a wide application because of its superior performance.