PMMA模板制备CeO2空心微球及低频阻尼性能

Preparation of CeO2 Hollow Nanospheres by PMMA Template and Their Low Frequency Damping Capacity

摘要:

以分散聚合法制备的聚甲基丙烯酸甲酯(PMMA)微球作为牺牲模板，通过六水硝酸铈的前驱体溶液均相沉淀和自组装制备了二氧化铈(CeO2) /PMMA复合微球，高温煅烧处理后得到CeO2空心微球，将其与丁基橡胶复合制备成低频高阻尼复合材料。采用傅里叶转换红外分析（FTIR），扫描电子显微镜(SEM)，透射电子显微镜(TEM)，热重分析仪(TG)，X射线衍射(XRD)和X射线光电子能谱(XPS)对CeO2空心球的形貌与结构组成进行表征。实验表明，CeO2空心球由立方萤石结构的颗粒组成，粒径约为0.9 μm，壳层厚度约40 nm。将CeO2空心微球作为填料加入橡胶中制备CeO2/橡胶复合材料；与纯丁基橡胶相比，复合橡胶材料在不同频率(0~180 Hz)下的低频阻尼性能得到明显提高。

Abstract:

With polymethyl methacrylate (PMMA) prepared by dispersion polymerization as sacrifice template, CeO2/PMMA composite microspheres were prepared by inorganic precursor homogeneous precipitation and self-assembly. The CeO2 hollow nanospheres were obtained after the polymer sphere template was removed through calcination at a suitable temperature. Scanning electron microscope, transmission electron microscope, fourier transform infrared spectroscopy, X-ray photoelectron spectrum, X-ray diffraction and thermogravimetry were employed to characterize the structure and morphology of the CeO2 hollow nanospheres. The results reveal that the face-centered cubic-phase CeO2 hollow nanospheres with a diameter of about 0.9 μm as well as the thin shell thickness about 40 nm are prepared. It indicates that adding CeO2 hollow nanospheres in butyl rubber as packing materials can obviously improve its low frequency damping capacity in different frequency (0~180 Hz).