C-Al2O3-TiO2 nanocomposites with a dual pore system were synthesized via the sol-gel tri-constituent co-assembly process using an amphiphilic triblock copolymer F127 (PEO106PPO70PEO106, MW=12600) as a template, aluminum isopropoxide and tetrabutyl titanate as metallic sources and resol as an organic precursor.X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and nitrogen adsorption/desorption were used to characterize the structures of these nanocomposites.The results show that the nanocomposite with a Al/Ti molar ratio of 1∶10 has ordered mesoporous structures with a dual system of 3.9 and 6.5 nm, a high specific surface area of 259 m2·g-1and a pore volume of 0.37 cm3·g-1.Low infrared emissivity coatings were obtained using the ethylenepropylenediene monomer (EPDM) as an adhesive and the ordered mesoporous C-Al2O3-TiO2 nanocomposites as a filling.As the Al/Ti molar ratio and coat thickness changed the infrared emissivities changed from 0.450 to 0.617.%以嵌段共聚物F127(PEO106PPO70PEO108,Mw=12600)为模板剂,异丙醇铝和钛酸四丁酯为金属源,低分子量的酚醛树脂为碳源,通过溶胶一凝胶三元共组装法合成了具有双孔径分布的C-Al2O3-TiO2纳米复合材料.用X射线衍射(XRD)、透射电子显微镜((TEM)、扫描电子显微镜((SEM)及N2吸附一脱附对该复合材料进行结构表征.结果显示,当铝钦原子的摩尔比为1:10时,对应的纳米复合材料具有较好的有序介孔结构,其双孔径分别为3.9和6.5nm,比表面积可达259m2·g-1,孔容0.37cm·g-1.以三元乙丙橡胶(EPDM)为粘结剂,与介孔纳米复合材料混合制备涂层.通过调节复合材料中铝钦摩尔比和涂层厚度,红外发射率在0.450-0.617之间可调.
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