基于傅里叶红外光谱的癸酸-棕榈酸/SiO_2相变储湿复合材料制备机理研究

Study on Preparation Mechanism of Decanoic Acid-Palmitic Acid/SiO_2 Phase Change and Humidity Storage Composite Materials by Fourier Transform Infrared Spectrum

根据前期在相变储湿复合材料制备方面取得的成果,以SiO_2为载体材料、癸酸-棕榈酸为相变材料,采用溶胶-凝胶法制备癸酸-棕榈酸/SiO_2相变储湿复合材料。采用傅里叶红外光谱仪对癸酸-棕榈酸/SiO_2相变储湿复合材料制备过程各阶段的合成物质进行测试,即相变材料制备阶段、SiO_2载体材料制备阶段和癸酸-棕榈酸/SiO_2相变储湿复合材料制备阶段。研究SiO_2基相变储湿复合材料制备过程中SiO_2网络结构形成机理、癸酸-棕榈酸嵌入方式、癸酸-棕榈酸与SiO_2嵌合机理,阐明溶胶-凝胶法制备癸酸-棕榈酸/SiO_2相变储湿复合材料的相关机理。同时采用X射线衍射仪和扫描电子显微镜对癸酸-棕榈酸/SiO_2相变储湿复合材料的物质组成和微观形貌进行测试,以佐证癸酸-棕榈酸/SiO_2相变储湿复合材料的制备机理。结果表明:通过Si—O—Si基团断裂与重组形成大量闭合孔或笼有效地将癸酸-棕榈酸包覆,从而制备形成癸酸-棕榈酸/SiO_2相变储湿复合材料;在癸酸-棕榈酸/SiO_2相变储湿复合材料制备过程中癸酸-棕榈酸与SiO_2仅仅为物理嵌合,未发生任何化学反应;癸酸-棕榈酸/SiO_2相变储湿复合材料中SiO_2形成大量闭合孔或笼,一部分用于包覆癸酸-棕榈酸,发挥相变调温性能,另一部分利用其网络空隙结构,发挥储湿调湿性能,从而达到同时调节室内温度和湿度的目的。

According to the research achievements of phase change and humidity storage composite materials preparation in early stage, SiO2-based phase change and humidity storage composite materials were made by sol-gel method with SiO2 as the carrier and decanoic acid-palmitic acid as a phase change material in this paper. Synthetic materials in every stage of preparation process of decanoic acid-palmitic acid/SiO2 phase change and humidity storage composite materials were measured by Fourier transform infrared spectrum, such as phase change material preparation stage, SiO2 carrier material preparation stage and decanoic acid-palmitic acid/SiO2 phase change and humidity storage composite materials preparation stage. In the process of decanoic acid-palmitic acid/SiO2 phase change and humidity storage composite materials preparation, SiO2 network structure forming mechanism, decanoic acid-palmitic acid embed mode, chimeric mechanism of SiO2 and decanoic acid-palmitic acid were researched, respectively, in order to explain the mechanism of how to prepare decanoic acid-palmitic acid/SiO2 phase change and humidity storage composite materials by sol-gel method. Meanwhile, material composition and micro topography of decanoic acid-palmitic acid/SiO2 phase change and humidity storage composite materials were tested by X-ray diffracmeter and scanning electron microscope, so as to provide evidence about preparation mechanism of decanoic acid-palmitic acid/SiOz phase change and humidity storage composite materials. The results showed that decanoic acid-palmitic acid is packed in a large number of closed pores or cages which were formed through breaking and restructuring of Si-O-Si groups; then, decanoic acid-palmitic acid/SiO2 phase change and humidity storage composite materials can be prepared based on those mentioned above. Decanoic acid-palmitic acid and SiOz are only physical chimeric to each other, without any chemical reaction in the preparation process of decanoic acid-palmitic acid/Si02 phase change and humidity storage composite materials. A large number of closed pores or cages are formed by SiO2 in acid-pal- mitic acid/SiO2 phase change and humidity storage composite materials, of which one part is used for coating decanoic acid-palmitic acid with phase change thermal control performance, and the other part is used for network space structure with humidity storage humidity control performance, in order to achieve the purpose of adjusting indoor temperature and humidity at the same time.