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摘要以甲基丙烯酸甲酯(MMA)为单体，过硫酸钾(KPS)为引发剂，采用无皂乳液聚合的方法成功制备出单分散的微纳米级聚甲基丙烯酸甲酯(PMMA)。通过改变反应体系中单体MMA的量、引发剂KPS的浓度以及离子强度、助溶剂丙酮的量等实验条件，使聚合物微球的尺寸控制在可见光波长范围内。采用傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)、差示扫描量热仪(DSC)、热重分析(TGA)等表征方法，系统地研究了PMMA微球的结构、形态、粒径及热性能。重点讨论单体、引发剂用量、离子强度以及助溶剂丙酮对单体转化率、微球粒径的影响。结果表明实验条件的变化对于微球的粒径影响显著，并有一定的规律性。20780
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关键词 无皂乳液聚合 聚甲基丙烯酸甲酯 聚合物微球 粒径分布
毕业论文设计说明书(论文)外文摘要
Title The study of preparation and dispersion of PMMA microspheres
Abstract
Monodisperse micro-nano poly (methyl methacrylate) (PMMA) was successfully prepared by soap-free emulsion polymerization method with methyl methacrylate (MMA) as monomer and potassium persulfate (KPS) as initiator. The size of polymer microsphere was controlled in the range of visible wavelengths by adjusting the amount of MMA monomer, initiator concentration, ionic strength and the amount of co-solvent acetone.The structure, morphology, particle size and thermal properties of PMMA microspheres were systematically studied by fourier transform infrared spectroscopy (FTIR),scanning electron microscopy (SEM), differential scanning calorimetry (DSC) andthermogravimetric analysis (TGA).The effects of the amount of monomer, initiator,ionic strength and co-solvent on the monomer conversion and the particle size of the microspheres were emphatically discussed. The results showed that changes in experimental conditions had significant effect on the microspheresparticle size, and the regularity was observed.
Keywords soap-free emulsion polymerizationpoly
(methyl methacrylate)polymer microspheresparticle
size distribution
目 录
1 绪论 1
1.1 概述 1
1.2无皂乳液聚合 2
1.2.1无皂乳液聚合机理 2
1.2.2无皂乳液聚合方法 3
1.2.3无皂乳液聚合的稳定性 4
1.3研究内容 4
2 实验部分 6
2.1 概述 6
2.2 实验原料及仪器 6
2.3 MMA的精制 7
2.4 PMMA微球的制备 7
2.4.1 改变单体浓度系列 8
2.4.2 改变引发剂浓度系列 8
2.4.3 改变离子强度系列 9
2.4.4 改变助溶剂用量系列 9
2.5 性能测试 10
2.5.1 红外吸收光谱表征(IR) 10
2.5.2 示差扫描量热法测试(DSC) 10
2.5.3 热失重测试(TGA) 10
2.5.4 扫描电子显微镜观察(SEM) 10
2.6 本章小结 10
3 结果与讨论 12
3.1 概述 12
3.2 红外吸收光谱表征分析 12
3.2 扫描电子显微镜观察分析 13
3.2.1 单体浓度对PMMA微球粒径的影响 13
3.2.2 引发剂浓度对PMMA微球粒径的影响 15