Person: MADAKBAŞ, SEYFULLAH
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MADAKBAŞ
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SEYFULLAH
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Publication Metadata only Preparation and electrical properties of polypyrrole containing photocured thiol-ene based composites(ELSEVIER SCIENCE SA, 2015) DUMLUDAĞ, FATİH; Madakbas, Seyfullah; Dumludag, Fatih; Eminoglu, Elif Merve; Sen, Ferhat; Kahraman, Memet VezirIn this study, UV curable polypyrrole containing thiol ene based composite films were prepared by the reaction between Propoxylated (2) neopentyl glycol diacrylate (SR 9003), Trimethylolpropane tris(3-mercaptopropionate), (3-mercaptopropyl)trimethoxysilane, 1-vinyl-2-pyrrolidinone and polypyrrole. FT-IR was used to confirm the formation of the composites. Thermal stability of the samples was evaluated by thermogravimetric analysis (TGA). The samples were characterized with the following analysis; gel content, water absorption capacity. Hydrophobicity of the samples was determined by the contact angle measurements. Direct current (dc) conductivity measurements of samples were performed depending on polypyrrole content in the composites at room temperature. Capacitance measurements (40 Hz-100 kHz) of the samples were performed in the temperature range of 295-378 K. Dc conductivity and capacitance values of the samples were measured in vacuum in dark. Dc conductivity measurements revealed that dc conductivity values increased with increasing polypyrrole content. Dielectric measurements revealed that dielectric constant of the samples increased with increasing temperature and decreased with increasing frequency. It is also observed that dielectric constant of the samples decreased with increasing polypyrrole content. (C) 2014 Elsevier B.V. All rights reserved.Publication Metadata only Polyurethane graphene nanocomposites with self-healing properties by azide-alkyne click reaction(ELSEVIER SCIENCE SA, 2020) OKTAY, BURCU; Akhan, Seda; Oktay, Burcu; Ozdemir, Oguz Kaan; Madakbas, Seyfullah; Apohan, Nilhan KayamanNanocomposites stand out as promising materials in many fields due to their properties such as strength, hardness, thermal stability, and lightness. Introducing self-healing ability to polymer nanocomposites provides new guidelines for strong, sustainable, and durable materials. Microcapsule-based self-healing materials work independently of an external stimulus such as pH, heat, light and solvent. In this paper, we developed autonomously self-healing UV-cured polyurethane graphene oxide nanocomposite coatings by means of efficient and useful copper-catalyzed azide-alkyne (CuAAC) click chemistry. Low molecular weight tetra-arm azide was successfully capsulated within poly(vinyl formal) capsules. Alkyne functional graphene-oxide reinforced nanocomposites containing azide microcapsules were prepared through photo-polymerization. The self-healing ability and anti-corrosion properties of the nanocomposites were studied after the damage occurred. The self-healing experiments show that the microcapsules provided a self-healing efficiency of around 70% after 24 h. Chemical, morphologic, mechanical, and thermal properties of the films were investigated. Furthermore, the electro-chemical analysis of films showed that the microcapsule containing films has a higher polarization resistance and a lower corrosion current.Publication Open Access Preparation and characterization of UV‑cured epoxy acrylate‑based nanocomposite coatings containing organonanoclay(2022-08-01) KARATAŞ, SEVİM; MADAKBAŞ, SEYFULLAH; Turna M., Şen F., Madakbaş S., Karataş S.In this study, it is aimed to obtain UV-cured nanocomposite coatings. UV-curable epoxy acrylate resins were synthesized by reacting aliphatic-based epoxy resin with adipic acid and acrylic acid at certain rates and their chemical structures were characterized. The synthesized resins were reinforced with organonanoclay at diferent rates, applied as a flm to plexiglass surfaces and cured with UV rays. The thermal properties, fammability, thermomechanical properties, surface properties, morphological properties, light transmittance and durability properties of the obtained nanocomposite coatings containing organonanoclay were investigated. With 5% organonanoclyay reinforcement to the epoxy acrylate resin, the temperature of fnal mass loss increased from 521 to 557 °C, char yield increased from 0.02% to 2.95, LOI increased from 22.1 to 23.5%, contact angle increased from 56 to 74°. The results showed that UV-cured nanocomposite coatings have the properties required by the coating industry, and these properties are improved with the addition of organonanoclay. Keywords Nanocomposite · Coating · UV-cured · Epoxy acrylate · OrganonanoclayPublication Metadata only Thermal and dielectric properties of flexible polyimide nanocomposites with functionalized nanodiamond and silver nanoparticles(2023-05-01) BİRTANE, HATİCE; MADAKBAŞ, SEYFULLAH; ESMER, KADİR; KAHRAMAN, MEMET VEZİR; Birtane H., Cigil A. B., Madakbaş S., Esmer K., Kahraman M. V.In the present study, amine groups were first modified to diamond and silver nanoparticles using APTMS to improve their homogeneous dispersion and compatibility in polyamic acid. Flexible polyimide nanocomposite films were successfully prepared by adding modified nanodiamond and silver nanoparticles to 4,4 \"-(1,3-phenylenedioxy) dianiline and benzophenone-3,3 \",4,4 \"-tetracarboxylic dianhydrides with different proportions. The effects of added amine-modified nanoparticles on dielectric constant and thermal stability were investigated. With SEM analysis, nanoparticles were homogeneously distributed on the polyimide surface and the presence of Si atom resulting from APTMS modification is clearly seen with the SEM-EDAX results. Considering the thermal resistance, the maximum decomposition temperature of the nano particle-free PI film was found to be 501 degrees C, while the thermal decomposition temperatures of the PI nanocomposite film that contains 1% m-Ag and the PI film that contains 5% m-ND, 502 degrees C and 505 degrees C, respectively. Also, it was seen that the dielectric constants of the prepared nanocomposite films that contain m-Ag NP decrease with increasing m-Ag NP ratio, and the dielectric constants of the films that contain m-ND increase with increasing m-ND ratio.