Wen Nangeng, Tang Qinqiong, Chen Min, Wu Limin
Department of Materials Science and the Advanced Coatings Research Center of China Educational Ministry, Advanced Materials Laboratory, Fudan University, Shanghai 200433, People's Republic of China.
J Colloid Interface Sci. 2008 Apr 1;320(1):152-8. doi: 10.1016/j.jcis.2007.11.059. Epub 2008 Feb 19.
This paper presents a method for the preparation of raspberry-like organic-inorganic composite spheres with poly(vinyl acetate) (PVAc) as core and nanosilica particles as shell. A small amount of anionic reactive surfactant, 3-allyloxy-2-hydroxy-1-propanesulfonic acid sodium salt (HAPS), was used as co-stabilizer and nanosilica particles were adsorbed onto the growing latex core in aqueous medium via the formation of hydrogen bonds between nanosilica particles and PVAc particles. TEM indicated that the hydrogen bonds between nanosilica particles and PVAc were strong enough for the formation of long-stable composite spheres with raspberry-like morphology. Influences of some synthetic parameters, for instance, type of silica sol, initial silica amount, and different kinds of low-molecular-weight surfactant, on the morphology of the composite spheres and properties of the latex films were studied in detail. A possible formation mechanism of the composite spheres was also proposed.
本文介绍了一种以聚醋酸乙烯酯（PVAc）为核、纳米二氧化硅颗粒为壳制备树莓状有机-无机复合球体的方法。使用少量阴离子反应性表面活性剂3-烯丙氧基-2-羟基-1-丙磺酸钠盐（HAPS）作为助稳定剂，纳米二氧化硅颗粒通过在纳米二氧化硅颗粒与PVAc颗粒之间形成氢键，在水介质中吸附到生长的胶乳核上。透射电子显微镜（TEM）表明，纳米二氧化硅颗粒与PVAc之间的氢键足够强，能够形成具有树莓状形态的长期稳定复合球体。详细研究了一些合成参数，例如硅溶胶类型、初始二氧化硅用量和不同种类的低分子量表面活性剂对复合球体形态和乳胶膜性能的影响。还提出了复合球体可能的形成机制。
