悬浮聚合制备苯乙烯性能的研究

范文编号:HG038  范文字数:14330,页数:30

摘  要
 首先采用悬浮聚合的方法以聚乙烯醇为分散剂，以过氧化苯甲酰为引发剂，制备出聚苯乙烯球状颗粒聚合物，并在实验中分别通过添加致孔剂十二烷，改变搅拌速度，改变引发剂用量和添加有机物丙酮设计出4组对照实验研究聚苯乙烯悬浮聚合的影响因素，并通过DSC和TGA分析不同条件下制的的聚苯乙烯的热性能。结果表明十二烷的加入会破坏反应体系，使反应不能正常进行；搅拌速度过大时会让聚苯乙烯小球变形；同时，引发剂的用量不能过少，并可适当多加，否则会使聚合成的聚苯乙烯热的品质下降，热稳定性不好；对于有机物丙酮的加入，在丙酮含量低于10%时对体系影响不大，所得聚苯乙烯的性能相对稳定，但当丙酮含量高于10%时会使聚合所得的聚苯乙烯热性能下降，至20%时会破坏原本的反应体系使苯乙烯的聚合不能正常进行。
 
关键词：悬浮聚合 聚苯乙烯 DSC TGA

Study on the performance of polystyrene were synthesized by suspension polymerization
ABSTRACT

 Preparation of the polystyrene that synthesized by suspension polymerization first, and use the PVA as the dispersant and the BPO as the initiator. Then we made four groups of  experim  -ent to analyse the influence of polystyrene, they is respectively adding the Dodecane 、change   the stirring speed、change the dosage of initiator、adding the different dosage of Acetone. And by DSC and TGA analysis of different conditions of polystyrene thermal performance. Results indicate that the addition of dodecane will destroy the reaction system of polystyrene, makes the reaction is not properly; mixing speed too large will let polystyrene beads transform to different shape; at the same time, the dosage of initiator cannot be too little, and may be appropriately more , as this will prevent polymerization of polystyrene thermal quality degradation, poor thermal stability; for organic acetone, when the acetone dosage below 10% the system has been little effect on performance from polystyrene, relatively stable, but when the dosage exceeds the 10% acetone will make aggregated polystyrene thermal performance degradation, to 20% will destroy the original response system that does not aggregate styrene. 
 
Key words: suspension polymerization; polystyrene; DSC; TGA

目  录
 
摘  要 I
ABSTRACT II
1前言 1
1.1 研究背景 1
1.2研究意义 1
2 聚苯乙烯的现状 2
2.1 聚苯乙烯概述 2
3 悬浮聚合的现状......................................5
3.1 悬浮聚合概述......................................5
4 实验部分.............................. ............10
4.1 实验药品与器材...................................10
4.2 实验过程.........................................10
 4.3 实验结果与讨论...................................14
5 结论...............................................23
参考文献.............................................24
谢辞 25

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