Zou Hua, Wang Xia
School of Materials Science and Engineering, University of Shanghai for Science and Technology , 516 Jungong Road, Shanghai 200093, China.
Langmuir. 2017 Feb 14;33(6):1471-1477. doi: 10.1021/acs.langmuir.6b03977. Epub 2017 Feb 3.
This paper presents a more general method to prepare silica-coated polystyrene (PS) particles with minimal excess silica by adsorption, highlighting the role of poly(N-vinylpyrrolidone) (PVP). The method is based on the addition of small silica nanoparticles onto submicrometer-sized near-monodisperse polymer latex particles under the conditions of monolayer silica coverage of the latex surface. Either a cationic or an anionic initiator could be used in the PVP-involved emulsion polymerization to prepare PS particles, and the adsorption was conducted successfully either under acidic or basic conditions. Neither a cationic initiator nor a basic condition is a prerequisite for the adsorption process, which should be related to the much stronger interaction between PVP and the silica surface. This method is expected to substantially extend the adsorption conditions of polymer-silica colloidal nanocomposite syntheses.
本文提出了一种更通用的方法，通过吸附制备二氧化硅包覆聚苯乙烯（PS）颗粒，使过量二氧化硅最少，并突出了聚（N-乙烯基吡咯烷酮）（PVP）的作用。该方法基于在乳胶表面单层二氧化硅覆盖的条件下，将小尺寸二氧化硅纳米颗粒添加到亚微米级近单分散聚合物乳胶颗粒上。在涉及PVP的乳液聚合中，阳离子引发剂或阴离子引发剂均可用于制备PS颗粒，且吸附在酸性或碱性条件下均能成功进行。阳离子引发剂和碱性条件都不是吸附过程的先决条件，这应该与PVP和二氧化硅表面之间更强的相互作用有关。该方法有望大幅扩展聚合物-二氧化硅胶体纳米复合材料合成的吸附条件。
