Polymer−Clay Nanocomposite Latex Particles by Inverse Pickering Emulsion Polymerization Stabilized with Hydrophobic Montmorillonite Platelets
Polymer−Clay Nanocomposite Latex Particles by Inverse Pickering Emulsion Polymerization Stabilized with Hydrophobic Montmorillonite Platelets
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DOI：
10.1021/ma052539t
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发表时间：
2006-02
期刊：
影响因子：
5.5
通讯作者：
D. Voorn;W. Ming;V. Herk
中科院分区：
文献类型：
--
作者：
D. Voorn;W. Ming;V. Herk
首次采用有机改性粘土片晶作为稳定剂进行了无表面活性剂的反相乳液聚合。制备了丙烯酰胺（AAm）和甲基丙烯酸羟乙酯（HEMA）的反相Pickering乳液，并用疏水性的Clostridium 20 A（MMT 20）稳定了乳液。以油溶性偶氮二异丁腈（AIBN）和水溶性偶氮二[2-甲基-N-（2-羟乙基）丙酰胺]（VA-086）为引发剂，成功地制备了粒径在700-980 nm的反相乳液。通过SEM和cryo-TEM已经揭示，胶乳被疏水粘土稳定，如颗粒的粗糙表面所例示的。热重分析（TGA）表明，所有的粘土片被纳入到复合颗粒，并在部分剥离状态所示的X-射线衍射研究。
We present the first surfactant-free inverse emulsion polymerization by using organically modified clay platelets as stabilizers. Colloidally stable inverse Pickering emulsions of aqueous acrylamide (AAm) or 2-hydroxyethyl methacrylate (HEMA) in cyclohexane stabilized by hydrophobic Cloisite 20A (MMT20) were prepared. With both oil-soluble 2,2'-azobis(isobutyronitrile) (AIBN) and water-soluble 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] (VA-086) as initiators, inverse latexes in the size range of 700-980 nm were successfully obtained. It has been revealed by SEM and cryo-TEM that the latexes were stabilized by hydrophobic clays, as exemplified by the rugged surface of the particles. It was shown from thermogravimetric analysis (TGA) that all the clay platelets were incorporated into the composite particles, and in partially exfoliated state as indicated by X-ray diffraction study.