论文题目：无皂化乳液聚合制备聚苯乙烯微球 专 业：高分子材料与工程

学 生：桑玮 （签字） 指导老师：后振中 （签字）

摘 要

随着科学技术的发展，高分子微球的应用越来越广泛，特别是单分散型聚合物微球受到人们的关注，成为研究热点。在各种高分子微球中，聚苯乙烯(PS)微球研究较多，应用较广，在色谱柱填料、光子晶体光学滤波器、光开关、高密度电磁数据存储器、化学和生物化学传感器等领域具有重要用途。传统PS微球的制备方法有:乳液聚合法，分散聚合法，悬浮聚合法。这些方法需要大量的添加剂，后处理复杂，环境污染严重，所得产品表面不洁净，成本较高。无皂乳液聚合是指完全不含乳化剂或仅含少量乳化剂的乳液聚合,与传统的聚合方法相比，成本低，后处理工艺简单，表面洁净，环境污染小。本文采用无皂乳液聚合法制备聚苯乙烯微球，研究了单体浓度，引发剂用量，反应体系离子浓度和温度对聚苯乙烯微球粒径的影响。结果表明，保持其它条件不变，聚苯乙烯微球的粒径随单体浓度的增大而增加；引发剂浓度增大，微球粒径减小；反应体系中离子强度增大，微球粒径增大，离子浓度过大时容易结块且不形成微球。另外，温度对苯乙烯聚合影响较大，温度相对较低时很难发生聚合。对所得产物进行红外光谱（FTIR）、扫描电镜（SEM）和激光粒度（DLS）的表征，结果显示，当苯乙烯用量为0.087mol，过硫酸钾用量为1.30mmol，NaCl用量为2.56mmol，反应温度为80℃，反应时间为12h时，所得PS微球的平均粒径约为0.83μm，分散性和粒径分布相对较好。

关键词：聚苯乙烯微球，无皂乳液聚合， 制备方法， 应用 选题类型:A

I

Subject:Soap-free emulsion polymerization preparation of polystyrene microspheres

Speciality:Polymer materials and engineering

student:Sang Wei (Signature) Instructor:HouZhenzhong (Signature) ABSTRACT

With the development of science and technology, the application of polymer microspheres more and more widely, especially the single dispersible polymer microspheres by the attention of people, become a research hotspot. Among various kinds of polymer microspheres, polystyrene (PS) microspheres, which is widely used in the chromatographic column packing, photonic crystal optical filter, light switch, high-density electromagnetic data storage and chemical and biological chemical sensors, etc. Traditional preparation of PS microspheres: emulsion polymerization, dispersion polymerization, suspension polymerization. These methods need a lot of additives, post-processing complex and serious environmental pollution, the product surface is not clean, the cost is higher. Soap-free emulsion polymerization is entirely without emulsifier or only contains a small amount of emulsifier in emulsion polymerization, compared with the traditional polymerization methods, low cost, simple post-treatment processing, the surface is clean, environment pollution is small. This article studied the monomer concentration, initiator dosage, reaction system ion concentration and temperature on the influence of particle size of polystyrene microspheres. The results showed that other conditions remain unchanged, the particle size of polystyrene microspheres increased along with the increase of monomer concentration; Initiator concentration increases, the microspheres particle size decreased; Reaction system in the ionic strength increases, the

II

microspheres particle size increases, the ion concentration is too large when easy to agglomerate and formation of microspheres. In addition, the influences of temperature on the polymerization of styrene; aggregation at relatively low temperature is difficult to occur. The products for the infrared spectra (FTIR), scanning electron microscopy (SEM) and laser particle size (DLS) characterization, results show that when the dosage of styrene is 0.087 mol, dosage of potassium persulphate 1.30 mmol, dosage of NaCl was 2.56 mmol, the reaction temperature is 80 ℃, the reaction time of 12 h, the average particle size of the PS microspheres of about 0.83 μm, dispersion and particle size distribution is relatively good。 Key words: polystyrene microspheres, soap-free emulsion polymerization, the preparation methods， applications Topic type: A

III