毕业论文--无皂乳液聚合法制备单分散聚苯乙烯微球的研究.doc

 无皂乳液聚合法制备单分散微球研究 随着科学技术的发展微球的应用越来越广泛如何调控因素不同粒径的单分散，对推动的应用有着重要意义尤其是制备胶体晶体着非凡的意义。 介绍和总结制备反应条件同时通过透射电显微镜TEM)对进行表征分析实验结果表明法制备有效方法适当的得到不同粒径的聚苯乙烯微球，且单分散性好。 关键词：；；TEM  Preparation of monodisperse polystyrene microspheres by emulsifier-free emulsion polymerizationAbstract With the development of science and technology, monodisperse microspheres are applied more and more widely. How to control the factors, preparing for different particle sizes of monodisperse microspheres, is of great significance to improve the application of monodisperse microspheres, especially on the preparation of colloidal crystals. In this paper, an emulsifier-free emulsion polymerization technique was chosen to synthesise PS particles, and the latest research developments and application of the soap-free emulsion polymerization were introduced. In order to determine the favorable reaction conditions for the preparation of monodisperse microspheres, this paper researched reaction temperature, monomer dosage, initiator dosage, reaction time and other factors on the size of polystyrene microspheres and particle size distribution in the soap-free emulsion system, besides PS particles were characterized by transmission electron microscopy (TEM). The result showed that, the emulsifier-free emulsion polymerization technique was an effective method to synthesise PS particles, and polystyrene microspheres with different particle sizes could be obtained by using appropriate reaction conditions, which had good monodispersity. Key words: soap-free emulsion polymerization; polystyrene microsphere; monodispersity; TEM  目 录 第1章 前言 1 1.1 单分散微球简介 1 1.2 单分散微球的制备方法 1 1.2.1 乳液聚合法 1 1.2.2 分散聚合法 3 1.2.3 悬浮聚合法 4 1.2.4 种子乳液聚合法 4 1.2.5 无皂乳液聚合法 4 1.3 单分散微球的应用 6 1.3.1单分散功能性微球 6 1.3.2 标准计量的基准物 6 1.3.3 有序多孔材料 6 1.3.4 涂料和粘合剂 7 1.4 论文选题的目的和意义 7 第2章 实验部分 9 2.1 实验试剂 9 2.2 实验仪器 9 2.3 实验装置 10 2.4 实验原理 10 2.4.1 自由基聚合的反应历程 11 2.4.2 自由基聚合反应的特征 12 2.5 实验内容 13 2.5.1 实验准备阶段 13 2.5.2 实验阶段 13 第3章 实验结果与讨论 15 3.1 单分散性分析 15 3.2 反应温度的影