种子溶胀法制备交联大粒径的聚苯乙烯微球的研究 毕业论文.doc

摘 要 单分散交联聚合物微球因其具有良好的耐热和耐溶剂性能、力学性能、吸附性能以及表面活性，在生物医药、电子信息、分析化学、标准计量及环境保护等许多领域有着广阔的应用前景，对其研究与开发受到越来越多的重视。 本论文首先研究分散聚合法制备单分散交联聚苯乙烯微球，采用种子溶胀法加工工艺，并选择了合理的分散聚合体系，考察不同分散聚合参数，诸如：初始单体浓度、溶胀剂种类、溶胀时间、交联剂浓度等因素对聚合体系稳定性、微球粒径及其分布的影响和变化规律 根据分析表明，随着温度的升高所制备聚合物微球材料失重比率迅速增加，。采用活性溶胀聚合法成功制得大粒径单分散由的交联聚苯乙烯微球，实验得出以1,2二氯乙烷为溶胀剂、DOA为助溶胀剂时，制得窄分布且最大粒径为3.195μm的交联聚苯乙烯微球。 关键词：聚苯乙烯微球；TGA分析；交联聚苯乙烯微球 Monodisperse crosslinked polymer microspheres because of its excellent heat and solvent resistance , mechanical properties, adsorption properties and surface activity, biomedicine, electronic information , analytical chemistry, and environmental protection standard measurement in many areas has broad potential applications for its research and development by more and more attention. In this thesis research dispersion polymerization monodisperse crosslinked polystyrene microspheres , using the method of seed swelling process and choose a reasonable dispersion polymerization system , effects of different dispersion polymerization parameters, such as : the initial monomer concentration , type of swelling agent , swelling time , the crosslinker concentration on the polymerization system stability , particle size and size distribution of and variation . In the TGA analysis showed that with increasing temperature the preparation of the polymer microspheres rapid weight loss rate , and this is due to the additional crosslinking polystyrene microspheres molecular structure is changed , the original structure of the molecule with a linear the body becomes the molecular structure , which greatly increases its thermal and mechanical properties, it has a ratio of non-crosslinked polystyrene microspheres high thermal decomposition temperature. Using reactive swelling and polymerization successfully prepared by a large monodisperse crosslinked polystyrene microspheres , the experimental results of 1,2 - dichloroethane as the swelling agent , DOA is to help the swelling agent, to obtain a narrow distribution