Silica Nanoparticles as Surfactants and Fillers for Latexes Made by Miniemulsion Polymerization
Silica Nanoparticles as Surfactants and Fillers for Latexes Made by Miniemulsion Polymerization
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DOI：
10.1021/la010445g
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发表时间：
2001-08
期刊：
影响因子：
3.9
通讯作者：
F. Tiarks;K. Landfester;M. Antonietti
中科院分区：
文献类型：
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作者：
F. Tiarks;K. Landfester;M. Antonietti
在偶联单体、疏水剂和二氧化硅纳米颗粒的存在下，采用微乳液法制备了由苯乙烯、丙烯酸丁酯和甲基丙烯酸甲酯等多种单体组成的聚合物分散体。根据反应条件和所使用的表面活性剂的不同，得到了不同的杂化形态，包括“刺猬”结构，其中二氧化硅包围着乳胶液滴，即使没有任何低分子量表面活性剂也能提供稳定。在组成图的其他部分，可以制造出非耦合结构以及“覆盆子”杂化结构，其中整个二氧化硅纳米颗粒簇完全嵌入聚合物颗粒中。由此产生的结构在许多应用中是有希望的，例如在水性涂料中增加抗划伤性。
Polymer dispersions made of a variety of monomers, including styrene, butyl acrylate, and methyl methacrylate, were generated by the miniemulsion process in the presence of a coupling comonomer, a hydrophobe, and silica nanoparticles. Depending on the reaction conditions and the surfactants employed, different hybrid morphologies were obtained, comprising a “hedgehog” structure where the silica surrounds the latex droplet and provides stabilization even without any low molecular weight surfactant. In other parts of the composition diagram noncoupled structures as well as “raspberry” hybrids where whole clusters of silica nanoparticles are completely embedded in the polymer particle can be made. The resulting structures are promising for a number of applications, e.g. the increase of scratch resistance in water-based coatings.