Person: ÇAKIR, MUSTAFA
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ÇAKIR
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MUSTAFA
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Publication Metadata only Phosphorus-containing sulfonated polyimides for proton exchange membranes(WILEY-V C H VERLAG GMBH, 2008) ÇAKIR, MUSTAFA; Cakir, Mustafa; Karatas, Sevim; Menceloglu, Yusuf; Kayaman-Apohan, Nilhan; Guengoer, AtillaSynthesis and characterization of the novel sulfonated BAPPO monomer and its use in the synthesis of a new phosphine oxide-based sulfonated polyimide are described. BTDA, 6FDA, and DDS were used as monomers in the polyimide synthesis. Sulfonated polyimide membranes were obtained by a solution thermal imidization method. The thermal behavior of the polymers was investigated by DSC and TGA. The morphological structure of the membranes was investigated by tapping-mode AFM. The proton conductivities of the sulfonated polyimide increased regularly as a function of sulfonated diamine content. The conductivities are good compared to typical proton exchange membranes.Publication Metadata only UV-curable interpenetrating polymer networks based on acrylate/vinylether functionalized urethane oligomers(PERGAMON-ELSEVIER SCIENCE LTD, 2005) ÇAKIR, MUSTAFA; Kayaman-Apohan, N; Demirci, R; Cakir, M; Gungor, AThe synthesis of simultaneous full interpenetrating polymer networks (IPN) based on Bisphenol A or 6F Bisphenol A bearing acrylated urethane (Bis A or 6F Bis A based Acryl-U) oligomers and vinylether functionalized polydimethyl siloxane containing urethane oligomer (PDMS-VEU) is described. The structures of the oligomers were characterized by FTIR. All resins were successfully polymerized by UV-irradiation in the presence of corresponding reactive diluents and photoinitiators. Physical properties of IPNs were determined by extraction and water absorption measurements. Extractable parts of IPNs were found to be approximately between 10 and 35 wt%. The stress-strain tests showed that an improvement was obtained on tensile properties by addition of PDMS-VEU oligomer to the Bis A based Acryl-U resin. In addition IPN sample (90/10 wt%) has higher thermo-oxidative stability compared to the neat films. (c) 2004 Elsevier Ltd. All rights reserved.Publication Metadata only Epoksi-polyester karışımlarının aşınma özelliklerinin incelenmesi(2006-12-14) KARTAL, İLYAS; BOZTOPRAK, YALÇIN; BİLİCİ, MUSTAFA KEMAL; ÇAKIR, MUSTAFA; KARTAL İ., BOZTOPRAK Y., BİLİCİ M. K., ÇAKIR M.