Browsing by Author "Dizman, C."
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Item Open Access Polysulfone / clay nanocomposites by in situ photoinduced crosslinking polymerization(Wiley, 2011) Dizman, C.; Ates, S.; Uyar, Tamer; Tasdelen, M. A.; Torun, L.; Yagci, Y.PSU/MMT nanocomposites are prepared by dispersing MMT nanolayers in a PSU matrix via in situ photoinduced crosslinking polymerization. Intercalated methacrylate-functionalized MMT and polysulfone dimethacrylate macromonomer are synthesized independently by esterification. In situ photoinduced crosslinking of the intercalated monomer and the PSU macromonomer in the silicate layers leads to nanocomposites that are formed by individually dispersing inorganic silica nanolayers in the polymer matrix. The morphology of the nanocomposites is investigated by XRD and TEM, which suggests the random dispersion of silicate layers in the PSU matrix. TGA results confirm that the thermal stability and char yield of PSU/MMT nanocomposites increases with the increase of clay loading. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Item Open Access Synthesis and characterization of polysulfone / POSS hybrid networks by photoinduced crosslinking polymerization(Wiley, 2013) Dizman, C.; Uyar, Tamer; Tasdelen, M. A.; Yagci, Y.Crosslinked polysulfone/polyhedral oligomeric silsesquioxane (POSS) hybrid networks were synthesized in this work by photoinduced copolymerization of polysulfone dimethacrylate (PSU-DMA) and multifunctional POSS-methacrylamide (POSS-MAAm) with various feed ratios. The morphology of the nanocomposites was investigated by transmission electron microscopy (TEM), which suggests the random dispersion of POSS in the PSU matrix without macroscopic agglomeration. Thermogravimetric analysis results confirmed that the thermal stability and char yield of PSU-DMA/POSS-MAAm nanocomposites increased with the increase of POSS loading. Enhanced glass transition temperatures and storage modulus of the networks were observed to be higher than its precursor polymer. Polysulfone-based hybrid networks containing various POSS loadings are synthesized by photoinduced copolymerization of polysulfone dimethacrylate and multifunctional POSS-methacrylamide. While TEM results suggest the random dispersion of POSS in the polymer matrix, thermal and dynamic mechanical analyses clearly confirm the better thermal and mechanic behavior of hybrid networks. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.