酸处理对制备中空乳胶粒子的影响

The styrene(St) butyl acrylate(BA) copolymer was first prepared as seed emulsion and the final latex of St BA MA was then obtained from it with methyl acrylate(MA). The hollow polymer particles were obtained from poly(St BA MA) in the presence of dodecyl sulfonic sodium through alkaline and acid treatments. In this paper the effects of pH value, temperature and time of acid treatment on the hollow structure of polymer particles were investigated. The results showed that the largest hollow size can be obtained when acid treatment conditions were: pH 2 5, 85 ℃ and 3 hours.

中空聚合物乳胶粒子的制备

研究了在制备中空乳胶粒子的过程中，复合乳液［苯乙烯（Ｓｔ）－丙烯酸丁酯（ＢＡ）－甲基丙烯酸（ＭＡ）］进行种子乳液聚合时，Ｓｔ／ＢＡ的质量比和ＭＡ的用量对胶乳粒子的空径、粒径和表面羧基质量摩尔浓度的影响。实验结果表明，当Ｓｔ／ＢＡ的质量比为１９，ＭＡ质量分数为单体的５．６％时，形成的乳胶粒子的空径最大。

丙烯酸类中空聚合物粒子的制备与电泳性能

以甲基丙烯酸甲酯、丙烯酸丁酯、α-甲基丙烯酸和苯乙烯为单体,以过硫酸钠为引发剂,温度控制在78℃,搅拌速度为800 r/min,采用半连续加料法,经乳液聚合分别制得了种子、核及具有核壳结构的聚合物粒子。用动态光散射(DLS)、原子力显微镜(AFM)、扫描电镜(SEM)测得其平均粒径分别为72.1、400及500 nm。核壳粒子用w(NaOH)=10%的水溶液进行溶胀,得到的粒子经透射电子显微镜(TEM)显示为中空结构,在SEM下观察,其平均粒径在900 nm左右。用微电泳仪测得,该中空粒子在四氯乙烯分散介质中电泳淌度为0.004 98 s2.mA.kg,Zeta电位为0.032 2 mV,在水分散相中,Zeta电位为-43.880 mV。