单分散苯乙烯/丙烯酸丁酯共聚微球的制备

Preparation of Monodisperse Poly(Styrene-nButylacrylate) Microspheres

以苯乙烯和丙烯酸丁酯为反应单体,聚乙烯吡咯烷酮为分散剂,偶氮二异丁腈为引发剂,乙醇/水为分散介质,采用分散聚合法制备了微米级苯乙烯/丙烯酸丁酯共聚微球,通过红外光谱、核磁共振氢谱和扫描电镜对产物进行了表征,并且对不同聚合条件下,产物微球的粒径和粒径分布进行了研究。结果表明,随着苯乙烯/丙烯酸丁酯比值增大,粒子平均粒径和分布都减小;分散剂用量增加,粒子平均粒径减小,分布变窄;增加引发剂用量或提高温度,粒子平均粒径增大,分布变宽;随着乙醇/水比值增大,粒子平均粒径增大,分布有个极小值。

In this paper,micron-size polystyrene-n-butyl acrylate（BA） microspheres were prepared with the styrene and n-butyl acrylate as reaction monomer,poly（N-vinylpyrrolidone）（PVP） as a dispersant agent,2-2′azobisisobutyronitrile（AIBN） as the initiator,ethanol/water as dispersion medium by dispersion copolymerization.Products were characterized by infrared spectrum,1H nuclear magnetic resonance（1H-NMR） and scanning electron microscop（SEM）,the particle size and size distribution were also studied in the different conditions of polymerization.The result shows that mean diameter and particle size distribution reduces both;mean diameter reduces with the presence of PVP and the particle size distribution narrows;or increasing the temperature,the mean diameter enlarges and particle size distribution broadens;with ratio of ethanol/water increasing,the mean diameter enlarges,dispersion coefficient reaches its minimum values.