欢迎来北京东方德菲仪器有限公司!咨询接触角测量仪相关产品信息!
产品分类

Product classification

技术文章

Covalently closed microemulsions in presence of triblock terpolymers

更新日期:2009-05-04      浏览次数:2080

Abstract:
This paper is focused on the influence of polystyrene (PS)–poly(1,4-butadiene) (PB)–poly(ethylene oxide) (PEO) triblock terpolymers on the w/o microemulsion of the pseudo-ternary system water/sodium dodecylsulfate (SDS)/xylene-pentanol. Despite the insolubility of the copolymer in
water as well as in the xylene–pentanol mixture, it can be incorporated into the w/o microemulsion and interactions between the triblock terpolymer molecules and the anionic surfactant headgroups can be detected by differential scanning calorimetry (DSC) measurements. Furthermore, dynamic
light scattering measurements were used to determine the aggregate diameter of the modified microemulsions. For lower polymer concentrations large aggregates between 100 and 500 nm can be observed. Surprisingly, at a higher terpolymer concentration of 5 wt%, significant smaller
aggregate diameters can be identified by dynamic light scattering and Cryo-SEM. One can conclude that the copolymers are incorporated in the inverse microemulsion droplets, where the PB blocks cover the water droplets. The thermally induced radical cross-linking of the butadiene units in the presence of azobisisobutyronitrile (AIBN) leads then to covalently closed nanocapsules with an average size of 10 nm.
Keywords:Triblock terpolymer; Microemulsion; Nanocapsules

Copyright © 2024 版权所有:北京东方德菲仪器有限公司  ICP备案号:京ICP备05028011号-3  管理登陆  技术支持:化工仪器网   总流量:287567  网站地图

在线交流 联系方式 二维码

服务热线

010-68920257

扫一扫,关注我们