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BOZTOPRAK, YALÇIN

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YALÇIN

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Author: KAYAMAN APOHAN, NİLHAN × End date: 2009 ×

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    Synthesis of a novel bifunctional photoinitiator: Hybrid coatings on polycarbonate
    (WILEY-V C H VERLAG GMBH, 2007) KAHRAMAN, MEMET VEZİR; Kahraman, Memet Vezir; Kayaman-Apohan, Nilhan; Akdemir, Zumrut Seden; Boztoprak, Yalcin; Guengoer, Atilla
    The objective of this study was to synthesize a new bifunctional photoinitiator by the reaction between 1-hydroxy-cyclohexyl-phenyl-ketone and 3-isocyanato propyl trimethoxysilane (ICPTMS) and examine its capability in the photoinitiation process comparing it with the unmodified photoinitiator. This new photoinitiator also acts as a coupling agent for inorganic and organic phases. Therefore, its effect on the physical and mechanical properties of UV-curable transparent organic-inorganic hybrid coatings was investigated. The presence of the new bifunctional photoinitiator and TEOS, increased the abrasion resistance and also improved the hardness of the polymeric films.
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    Synthesis of fluorinated/methacrylated epoxy based oligomers and investigation of its performance in the UV curable hybrid coatings
    (ELSEVIER SCIENCE SA, 2009) KAHRAMAN, MEMET VEZİR; Kahraman, Memet Vezir; Bayramoglu, Guelay; Boztoprak, Yalcin; Gungor, Atilla; Kayaman-Apohan, Nilhan
    Organic-inorganic hybrid coatings based on fluorinated/methacrylated soybean oil and bisphenol A/F epoxy methacrylate were obtained by combining photopolymerization and sol-gel process. Hard and transparent hybrid coatings were prepared on polycarbonate panels and their physical and mechanical properties such as gel content, hardness, adhesion, gloss, contact angle as well as tensile strength were measured. Results from the mechanical measurements showed that the properties of hybrid coatings improved with the increase in fluorine and sol-gel precursor contents. Thermo gravimetric analysis results demonstrated that fluorine and silica incorporations significantly enhanced the thermal oxidative stability of the hybrid coating materials. The surface morphology was also characterized by scanning electron microscopy (SEM). SEM studies indicated that inorganic particles were dispersed homogenously throughout the organic matrix. (C) 2009 Elsevier B.V. All rights reserved.