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Öğe Poly(methacrylic) acid and ?-methacryloxypropyltrimethoxy silane/clay nanocomposites prepared by in-situ polymerization(Tubitak Scientific & Technological Research Council Turkey, 2002) Gültek, A; Seçkin, T; Önal, Y; Içduygu, MGPoly(methacrylic acid) and poly(acrylic acid) nanocomposites were prepared by in-situ polymerization of gamma-methacryloxypropyltrimethoxysilane (A174)/clay nanocomposites in which the macromonomer was generated by grafting A-174 onto activated clay samples via hydroxyl groups or via intercalation. In- situ polymerization was carried out in the presence of an initiator. It was found that the structural affinity between the methacrylic or acrylic acid monomers and the amount of clay played an important role in the hybrid structure. The nanocomposites were quantified by both X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA), and differential thermal analysis (DTA).Öğe Polymerization and characterization of acrylonitrile with ?-methacryloxypropyltrimethoxy-silane grafted bentonite clay(Wiley, 2002) Seçkin, T; Gültek, A; Içduygu, MG; Önal, YNovel natural clay-polymer hybrid materials are prepared from natural bentonite that was modified with silane-coupling agent, gamma-methacryloxypropyltrimethoxysilane (A-174), and acrylonitrile. By changing the molar ratio of acrylonitrile in the initial monomer feed, several clay-hybrid materials were prepared. The structure and thermal stability of hybrid materials were investigated by various methods. The A-174-modified bentonite was dispersed in a solution of acrylonitrile in toluene. In this system, radical polymerization in the presence of AIBN was carried out. Product formed at the particle surface was either physically bound by entanglement or chemically bound by covalent bonding to the silane. In this way, core-shell morphology was obtained with an inorganic core and a polymer shell. The results showed that bonding at the surface of bentonite took place by hydrolytic cleavage of methoxy groups of A-174 with hydroxy groups of bentonite. (C) 2002 John Wiley Sons, Inc.Öğe Synthesis and characterization of asbestos-silane hybrid materials(Elsevier, 2005) Onal, Y; Yakinci, ME; Seçkin, T; Içduygu, MGIn this study, interaction of the silane coupling agent 3-(trimethoxysilyl)propylmethacrylate (A-174) and asbestos was investigated. A-174 grafted onto the surface of the asbestos was polymerized by radical initiator. FT-IR, thermogravimetric analysis (TGA), X-ray diffractometer (XRD), differential thermal analyzer (DTA) and scanning electron microscopy (SEM) were used to characterize modified particles. The effects of temperature on modified particles and were evaluated by differential thermal analysis. After modification with A-174, the effects of grafting on asbestos were discussed in terms of structural change and thermal stability. These results lead us to conclude that the silane coupling agent in asbestos serve as polymeric precursor to form polymer onto asbestos matrix resulting the hybrid materials in which the harmful effect of asbestos was prevented by covering the asbestos particles with polymer. (c) 2004 Elsevier B.V. All rights reserved.Öğe UV-absorption and thermal properties of Pb-doped glymo/damo-derived coating materials prepared by sol-gel process(Springer, 2005) Sayilkan, F; Asiltürk, M; Içduygu, MG; Sayilkan, H[Abstract Not Available]
