(完整版)分散聚合法制备单分散交联聚苯乙烯微球材料专业本科毕业设计

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TGA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，这是因为加入交联剂的聚苯乙烯微球的分子结构发生了改变，使原来具有线性结构的分子变成的体形分子结构，大大增大了它的热学性能和力学性能，故具有比非交联聚苯乙烯微球较高的热分解温度。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，实验结果也表明己二酸二辛酯具有较好的溶胀效果。

关键词：聚苯乙烯微球；TGA分析；交联聚苯乙烯微球

ABSTRACT

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 ing 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 and a maximum particle size of 3.195μm crosslinked polystyrene microspheres , experimental results show that dioctyl adipate having a good swelling results.

Keywords: polystyrene microspheres ; TGA analysis ; crosslinked polystyrene microspheres

目录

1 绪论 (1)

1.1 引言 (1)

1.2 单分散聚合物微球的制备方法 (1)

1.2.1 无皂乳液聚合 (3)

1.2.2 多步种子聚合 (4)

1.2.3 玻璃膜乳化法 (5)

1.3 分散聚合法 (6)

1.3.1 分散聚合概述 (6)

1.3.2 分散聚合机理研究 (8)

1.4 沉淀聚合法 (11)

1.5 蒸馏-沉淀聚合法 (12)

1.6聚合物微球的应用 (14)

1.7 立题依据 (15)

2 结果与讨论 (16)

2.1 引言 (16)

2.2 实验部分 (18)

2.2.1 原料及试剂 (18)

2.2.2 种子溶胀所需要的装置 (19)

2.2.3聚苯乙烯种子微球的制备 (19)

2.2.4种子球的选取以及定量的制备 (21)

2.2.5 溶胀时间对PS微球粒径及偏差的影响 (21)

2.2.6 溶胀剂种类对PS微球平均粒径及偏差的影响 (24)

2.2.7 单体浓度对聚苯乙烯微球的平均粒径及偏差的影响 (25)

2.2.8 交联剂的不同浓度对PS微球平均粒径及偏差的影响 (26)

3 结论与展望 (26)

3.1结论 (27)

3.2展望 (27)

致谢 (28)

参考文献 (29)