Yazar "Kalyon, Dilhan M." seçeneğine göre listele

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    Development of an epoxy based intumescent system comprising of nanoclays blended with appropriate formulating agents
    (ELSEVIER SCIENCE SA, 2015) Kahraman, Havva Tutar; Gevgilili, Halil; Pehlivan, Erol; Kalyon, Dilhan M.
    A novel intumescent coating technology for metallic surfaces was developed using functionalized clays, which were intercalated and exfoliated into nanodimensions. The nanoclays were formulated in epoxy resins and blended with appropriate additives to design intumescent coatings for metallic surfaces. With the high dispersion of nanoclay the flame retardancy is improved. The extent and the homogeneity of the exfoliation and dispersion of the clay particles were assessed employing small-amplitude oscillatory shear. The performance and properties of the coatings were evaluated by means of fire resistance testing, thermo-gravimetric analysis and mechanical properties. The incorporation of the nanoclays significantly increased the elasticity and the viscosity of the intumescent formulations and improved the fire resistance of the epoxy coatings. It is observed that significant gains in flame retarding properties could be achieved when the clay platelets could be adequately exfoliated and dispersed. (C) 2014 Elsevier B.V. All rights reserved.
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    Nanoclay dispersion into a thermosetting binder using sonication and intensive mixing methods
    (WILEY-BLACKWELL, 2013) Kahraman, Havva Tutar; Gevgilili, Halil; Kalyon, Dilhan M.; Pehlivan, Erol
    Suspensions of epoxy with 10% by weight of organomodified montmorillonite clay [Cloisite 30B], prepared by two different methods, viz. intensive batch mixing and sonication, were investigated. The characterization of linear viscoelastic material functions of the suspension using small-amplitude oscillatory shear during processing enabled the assessments of the dispersion capabilities of the two mixing methods. Thermal imaging was used to monitor the temperature distributions generated during mixing. Sonication was determined to be more effective in the dispersion of the clay into the epoxy resin than the intensive batch mixing process, as revealed by the significant increase of the dynamic properties upon sonication, which suggested that some degree of intercalation and exfoliation had taken place during sonication. The use of the linear viscoelastic material functions thus provided a relatively easy to implement method for the analysis of the dispersion effectiveness of the different processing methods and operating conditions. (c) 2012 Wiley Periodicals, Inc.