Preparation and characterization of emulsifier-free core–shell interpenetrating polymer network-fluorinated polyacrylate latex particles
Preparation and characterization of emulsifier-free core–shell interpenetrating polymer network-fluorinated polyacrylate latex particles
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DOI：
10.1016/j.colsurfa.2008.03.018
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
Xuejun Cui;Shuangling Zhong;Yan Gao;Hongyan Wang
中科院分区：
文献类型：
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作者：
Xuejun Cui;Shuangling Zhong;Yan Gao;Hongyan Wang
以水为反应介质，采用无乳化剂种子乳液聚合法制备了壳层富氟的无乳化剂核壳互穿聚合物网络（IPN）氟化聚丙烯酸酯乳胶粒子。由于形成互穿聚合物网络，氟化共聚物可以固定在颗粒表面。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、动态光散射（DLS）分析、傅里叶变换红外（FTIR）光谱分析、X射线光电子能谱（XPS）分析和热重分析（TGA）对所得核壳颗粒进行了表征。核壳颗粒具有非常窄的单峰粒径分布。乳胶膜的XPS分析表明，全氟烷基有在表面富集的趋势，乳胶膜结构中从膜-空气界面到膜-玻璃界面存在氟浓度梯度。此外，与相同条件下制备的交联聚丙烯酸酯乳胶膜相比，不含乳化剂的核壳IPN-氟化聚丙烯酸酯乳胶膜表现出更好的热稳定性、更高的接触角和更低的吸水率。
The emulsifier-free core–shell interpenetrating polymer network (IPN) fluorinated polyacrylate latex particles with fluorine rich in shell were prepared by emulsifier-free seeded emulsion polymerization with water as the reaction medium. The fluorinated copolymer could be fixed on the particle surface due to the formation of interpenetrating polymer network. The resultant core–shell particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS) analysis, Fourier transform infrared (FTIR) spectrometry, X-ray photoelectron spectroscopy (XPS) analysis and thermogravimetric analysis (TGA). The core–shell particles possessed very narrow monomodal particle size distributions. XPS analysis of the latex film displayed that perfluoroalkyl groups had the tendency to enrich at surface and there was a gradient concentration of fluorine in the structure of the latex film from the film–air interface to the film–glass interface. In addition, compared with the latex film of crosslinked polyacrylate prepared under the same condition, the emulsifier-free core–shell IPN-fluorinated polyacrylate latex film showed better thermal stability, higher contact angle and lower water uptake.