摘要
采用甲基丙烯酸单封端聚乙二醇大分子单体 (MAA PEG)为反应性稳定剂 ,使之与苯乙烯 /丙烯腈在乙醇 /水混合介质中三元分散共聚 ,利用单体间反应性差异及聚合物溶解性的不同 ,制备具有特殊形态的高分子颗粒 .电子显微镜观察发现 ,颗粒形态与反应时间、单体配比、MAA PEG浓度及分子量有关 .X射线光电子能谱研究表明 ,增加反应时间 ,颗粒表面聚集的亲水性PEG成分增加 ,中心是聚苯乙烯 ,外部凸起部主要为聚丙烯腈 ,高分子颗粒具有核 -壳结构 .调节苯乙烯浓度、MAA PEG浓度及介质组成可以控制颗粒大小 ,影响颗粒形态的主要因素是单体反应性差异和MAA PEG的分子量及浓度 .
Poly(ethylene glycol) macromonomer (MAA-PEG) with a methacryloyl end group was used as reaction stabilizer. Poly(acrylonitrile/styrene) particles having PEG chains on their surfaces were prepared by dispersion copolymerization of acrylonitrile and styrene using 2,2′-azobisisobutyronitrile (AIBN) as radical initiator in the presence of MAA-PEG macromonomer in mixture solvents of ethanol/water (7/3 by vol.). These particles with narrow size-distribution and unusual morphologies were characterized by transmission electron microscopy, scanning electron microscopy and laser light scattering. Also, the morphologies and particle sizes can be controlled by changing reaction conditions such as concentration and molecular weight of MAA-PEG macromonomer, concentration of styrene and solvent composition.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第6期615-619,共5页
Acta Chimica Sinica
基金
教育部高等学校骨干教师资助计划 (教技司 2 0 0 0 65)
江苏省十五科技攻关计划 (No.BE2 0 0 2 32 9)资助项目
