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利用超声辐照引发包覆乳液聚合制备了聚丙烯酸正丁酯(PBA)空心微球.TEM和DLS结果显示,空心微球粒径均一,壳层厚度均匀.FTIR结果显示,壳-核物质间以物理吸附相结合,没有形成化学键.同时,利用TEM和DLS研究了空心微球的形成机理,阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)在CMC浓度以下首先吸附在纳米SiO2粒子表面形成双层结构,然后丙烯酸正丁酯(BA)单体增溶进入CTAB层间,在超声辐照引发、分散作用下包覆聚合形成均一的PBA-SiO2壳-核粒子,再利用HF溶液去除无机核,得到PBA空心微球.
Poly (n-butyl acrylate) (PBA) hollow microspheres were prepared by ultrasonic irradiation initiated emulsion polymerization.The results of TEM and DLS showed that the hollow microspheres were uniform in size and uniform in shell thickness.The FTIR results showed that the shell- At the same time, the formation mechanism of hollow microspheres was investigated by TEM and DLS. The cationic surfactant cetyltrimethylammonium bromide (CTAB) first adsorbed on the surface of nanocrystals SiO 2 particles form a double-layer structure, and then the n-butyl acrylate (BA) monomer is solubilized into the CTAB layer to form a homogeneous PBA-SiO 2 shell-core particle by ultrasonic irradiation initiation and dispersion HF solution to remove inorganic nuclei to obtain PBA hollow microspheres.