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- W2003247997 abstract "Laponite clay was modified with combinations of organic ammonium surfactant and/or covalently bound poly(methyl methacrylate) (PMMA). Two polymer attachment methods were explored, one through reaction of a methacrylate compound with the clay's silanol group followed by in situ free-radical polymerization of methyl methacrylate (MMA), and the other through attachment of an ATRP initiator followed by brush polymerization. The free-radical method yielded clays with ca. 75 wt % of polymer bound though multiple attachment sites to the clay, whereas the ATRP method yielded ca. 68 wt % of bound polymer attached only at the chain end. The PMMA-modified clays were very dispersible in organic solvents and were solvent-blended with commercial PMMA at 1, 3, 5, and 10 wt % concentrations. The resulting nanocomposites were optically transparent and homogeneous. TEM images showed mixed intercalated and exfoliated dispersions. DMA analysis showed an increase in room temperature modulus of 50% at 5 wt % concentration for the clay with no surfactant and PMMA free-radical attachment." @default.
- W2003247997 created "2016-06-24" @default.
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- W2003247997 date "2006-08-01" @default.
- W2003247997 modified "2023-10-16" @default.
- W2003247997 title "Poly(methyl methacrylate)/Laponite Nanocomposites: Exploring Covalent and Ionic Clay Modifications" @default.
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- W2003247997 doi "https://doi.org/10.1021/cm0526361" @default.
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