【摘要】 以苯乙烯为单体,过硫酸钾为引发剂,研究了β环糊精对无皂乳液聚合反应的影响.结果表明,环糊精的引入可以大大加快反应速度,提高单体转化率,并且反应速度随环糊精加入量的增加而增大;同时,环糊精的引入能够减小制得的聚合物微球的粒度分布,使聚合物微球的粒径大小更加均匀,而对粒径的影响不是很大.动力学分析的结果表明,环糊精可以提高单体的反应活性.当环糊精/单体比例增大到0.2时,单体反应活性是空白体系的3.3倍.更多还原

【Abstract】 Cyclodextrins（CD）,characterized by their biocompatibility,environmental amity,and low price,have been used in many fields.In recent years,their application in polymer chemistry attracts great attention.In this paper,using styrene as monomer,K₂S₂O₈ as initiator,we investigated the influence of β-CD on the soap-free emulsion polymerization of styrene.It is found that the addition of β-CD can greatly accelerate the polymerization,and increase the monomer conversion.With increase of the amount of CD,the reaction rate also increases.After 5 h,the monomer conversion,in absence of CD,is only 60.3%,which is much lower than that in presence of 1.0 g CD（90%）.The final polymer particle-size distribution was more uniform than that without β-CD.The kinetic analysis indicated that β-CD could increase the monomer relative reactivity.AS the ratio of CD/monomer reaches 0.2,the monomer relative reactivity is more than 3 times of that in absence of CD.更多还原