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首页> 外文期刊>Journal of Applied Polymer Science >Facile Synthesis of Functional Silica/Polymer Composite Materials and Hydrophilic Hollow Polymer Microspheres
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Facile Synthesis of Functional Silica/Polymer Composite Materials and Hydrophilic Hollow Polymer Microspheres

机译：功能性二氧化硅/聚合物复合材料和亲水性空心聚合物微球的轻松合成

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Monodisperse functional silica/polymer coreshell composite materials with silica as core and hydrophilic polymer with various,; functional groups, Such as amide, carboxylic acid, hydroxyl, and pyridyl group, as shell were facilely, prepared by a two-stage reaction, in which the silica core with diameter of 179 min was synthesized in the first-stage reaction according to the Stober method. The functional polymer shell was then encapsulated onto the silica core by distillation-precipitation copolymerization of N,M-methyle-nebisacrylainide (MBAAm) as crosslinker and hydrophilic comonomers with different functional groups, including N-isopropylacrylamide, methacrylic acid, 2-hydroxyethyl methacrylate, and 4-vinylpyridine, in neat acetonitrile with 2,2'-azobisisobutyronitrile as initiator. The encapsulation of the functional polymer shell onto the silica core particles was driven by the hydrogen-bonding interaction between the hydroxyl group on the surface of silica core and the amide unit of MBAAm crosslinker as well Lis the functional groups of the comonomers during the distillation-precipitation polymerization without modification of the silica surface in absence of any stabilizer or surfactant. The shell thickness of the Composite can be controlled by MBAAm fraction in the monomer feed during the polymerization. Hydrophilic hollow polymer microspheres with various functional groups, including amide, carboxylic acid, hydroxyl, and pyridyl, were further developed after selective removal of silica core with hydrofluoric acid. The functional core-shell silica/polymer composites and the corresponding functional hollow microspheres were characterized with transmission electron microscopy, Fourier transform infrared spectra, and dynamic light scattering. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 1964-1975, 2009
机译：以二氧化硅为芯和各种亲水聚合物的单分散功能二氧化硅/聚合物核壳复合材料;通过两步反应轻松制备了壳等酰胺，羧酸，羟基和吡啶基等官能团，其中第一步根据反应条件合成了直径为179 min的二氧化硅核斯托伯方法。然后，通过N-M-甲基-nebisacrylainide（MBAAm）作为交联剂和具有不同官能团的亲水性共聚单体（包括N-异丙基丙烯酰胺，甲基丙烯酸，甲基丙烯酸2-羟乙酯，和4-乙烯基吡啶，在纯乙腈中，以2,2'-偶氮二异丁腈为引发剂。官能核聚合物壳在二氧化硅核颗粒上的包封是由二氧化硅核表面的羟基与MBAAm交联剂的酰胺单元之间的氢键相互作用以及在蒸馏过程中共聚单体的官能团引起的。在没有任何稳定剂或表面活性剂的情况下进行沉淀聚合而不会改变二氧化硅表面。可通过聚合过程中单体进料中的MBAAm分数来控制复合材料的壳厚度。在用氢氟酸选择性除去二氧化硅核后，进一步开发了具有各种官能团（包括酰胺，羧酸，羟基和吡啶基）的亲水性空心聚合物微球。通过透射电子显微镜，傅立叶变换红外光谱和动态光散射对功能性核-壳二氧化硅/聚合物复合材料和相应的功能性空心微球进行了表征。 （c）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：1964-1975，2009

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