新型核壳型纳米球形聚电解质刷的制备

Preparation of New Core-shell Spherical Polyelectrolyte Brushes Nanoparticles

采用光乳液聚合法成功合成了一种纳米球形聚电解质刷,该纳米球形聚电解质刷由核、壳两部分组成:核为直径320nm的聚丁二烯胶乳微球,壳为在其表面接枝的长度和接枝密度可控的线性聚丙烯酸链。分别比较了不同反应温度和引发时间对聚电解质刷接枝密度的影响。结果表明:纳米球形聚电解质刷粒径(D)和离子强度(CI)之间在实验范围内服从关系:D∝K.LogCI,K值反映纳米球形聚电解质刷接枝密度变化,受反应温度和引发时间控制,K值越大,接枝密度就越大。

A new kind of spherical polyelectrolyte brushes consisted of polybutadiene latex with diameter of 320 nm as core and chemically grafted linear poly（acrylic acid） chains as shell was synthesized by photoemulsion polymerization.To study the technology of synthesis of confined and high grafting density brushes,the effect of polymerization temperature and KPS initiation time on the grafting density was investigated.It is found that the diameter of core-shell spherical polyelectrolyte brushes nanoparticles（D） and the ionic strength（CI） accord with D∝K·LogCI,where K reflect grafting density,and the reaction temperature and KPS initiation time were key factors affecting the grafting density of PAA chains on the surface of PB core,which correspondingly resulted in the polyelectrolyte brushes with different grafting density and length of PAA chains.