纳米铝粉/聚苯乙烯包覆粒子的制备及表征

利用超声波的分散和粉碎作用,对纳米Al粒子进行了表面疏水处理。然后,以无水乙醇为反应介质,苯乙烯为单体,偶氮二异丁腈为引发剂,聚乙烯吡咯烷酮为分散剂,在氮气保护环境下,利用超声波的活化和引发作用,引发苯乙烯单体在纳米Al粒子表面进行分散聚合反应,制备出了纳米铝粉/聚苯乙烯包覆粒子。最后,运用多种测试手段对纳米Al/PS包覆粒子形貌、粒径大小及分布、表面特性、化学组成及结构等进行了表征。测试结果表明,所制备的纳米Al/PS包覆粒子已经形成了完整的球型核壳包覆结构,表面完整无缺陷,粒径大小约为2.0 m。

Preparation and characterization of nano-aluminium/polystyrene encapsulation particles

By taking advantages of the ultrasonic effects of dispersion, crushing, activation and initiation, the nano-aluminium/polystyrene (nano-Al/PS) encapsulation particles were prepared. The nano-Al particles were surface pretreated with the surfactants under ultrasonic irradiation. Then, the dispersion polymerization of styrene was initiated on the surface of nano-Al particles through ultrasonic irradiation in ethanol medium. In this reaction, the stabilizer was poly(N-vinyl pyrrolidone) (PVP), and the initiator was 2,2-azobisizobutyronitrile (AIBN). Finally, the encapsulation particles were respectively characterized by SEM, TEM, FTIR, thermogravimetric analysis (TGA), X-ray diffraction patterns (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that the size of nano-Al/PS encapsulation particles were about 2.0m. The polystyrene encapsulated nano-Al particles structure had good sphericity and smooth intact surface. Key words: nano-aluminium/polystyrene; encapsulation particles；dispersion polymerization；ultrasonic irradiation