以苯乙烯（St）和甲基丙烯酸甲酯（MMA）为单体，过硫酸钾（K2S2O8）为引发剂，采用无皂乳液聚合法制备苯乙烯和甲基丙烯酸甲酯的共聚物微球。研究了反应时间和引发剂加入方式对微球粒径分布的影响。运用FT-IR、FE-SEM、激光纳米粒度仪及Zeta电位仪等手段，对微球的组成成分、表面形态、粒径及其分布、表面电位进行了表征。59859

结果表明反应时间为24 h时，单体反应充分，获得的微球均一，且单体转化率较高；随着单体用量的增加，聚合物微球粒径逐渐增加。向反应体系中一次性加入引发剂，使得微球粒径分布均匀。

毕业论文关键词  苯乙烯   甲基丙烯酸甲酯   无皂乳液聚合   共聚物  

毕业设计说明书（论文）外文摘要

Title Research of preparation of  Poly(St-MMA) microsphere by Soap-free emulsion polymerization 

Abstract Poly (St-MMA)microspheres were successfully prepared through Soap-free emulsion polymerization, KPS as initiator, styrene and methyl methacrylate as monomers．The influence on particle size of reaction time and methods of adding initiator  have been investigated．The microsphere composition, surface morphology, surface potential particle size and its distribution were characterized by FE-IR spectroscopy, field emission scanning electron microscopy, and laser nano particle size analyzer.

The results showed: When the reaction time was  24 hour, the monomer responded to fully, the microspheres of same size obtained and conversion rate of monomers was higher .The size of microspheres was enlarged with increasing dosage of monomer.  The size of microspheres prepared by the method of adding initiator one time was uniform.

Keywords      styrene   methyl methacrylate   Soap-free emulsion polymerization     copolymer 

1  引言 1

1．1  高分子微球 1

1. 2  高分子聚合物微球的制备方法 1

1.2.1  乳液聚合 1

1.2.3种子乳液聚合 4

1.2.4无皂乳液聚合 5

1.2.5聚合方法的比较 6

1.3无皂乳液聚合法制备聚合物微球的研究状况 7

1.4小结 9

2  微球的制备 9

2.1实验方法概述 9

2.2 实验过程 10

2.2.1实验试剂和仪器 10

2.2.2 实验部分 10

3 测试与表征 11

4 结果与讨论 12

4.1红外分析 12

4.2 Poly(St -MMA)共聚物微球的粒径分布 13

4.3 Poly(St-MMA)共聚物微球的扫描电镜分析 13

4.4 Poly(St-MMA)共聚物微球表面电位表征 14

4.5 引发剂不同滴加方式制备的微球 15

4.7 不同反应时间对制备的聚合物微球的影响 16

结  论 17

致  谢 18

参考文献 19

 1 引言

1．1 高分子微球