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    Coating, mechanical and thermal properties of epoxy toluene oligomer modified epoxy resin/sepiolite composites
    (ELSEVIER SCIENCE SA, 2012) Ahmetli, Gulnare; Deveci, Huseyin; Soydal, Ulku; Seker, Asli; Kurbanli, Refika
    In this research, epoxy toluene oligomer (ETO) was synthesised from toluene and epichlorhydrin, which was used as co-matrix in 50 wt.% with commercial epoxy resin (ER). Its chemical structure was characterised with FTIR spectroscopy and chemical analyses. ETO was found as an effective flame retardant for ER. Modification of ER with ETO in 50 wt.% increased percentage elongation at break of neat ER about 67 times. The rigid filler used in epoxy polymer matrix was the modified and unmodified sepiolite. The appropriate sepiolite amount in all cases was determined to be 5 wt.%. Scanning electron microscopy (SEM) was used for characterisation of surface and cross sections of the composites to verify the results. Modification of sepiolite increases the T-5, T-10, and T-50 of neat ETO-ER by 10, 7, and 5 degrees C, respectively. Surface hardness and tensile strength of all composites were higher than those of neat ETO-ER polymer matrix. ETO-ER/modified sepiolite coating showed the best adhesion results and exhibited perfect resistance to 3% NaCl and 10% NaOH solutions. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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    Corrosion and thermal characterization of styrene based copolymers
    (ELSEVIER SCIENCE SA, 2011) Ahmetli, Gulnare; Deveci, Huseyin; Altun, Ahmet; Kurbanli, Refika
    Films from copolymers with resistance to wear, corrosion and thermal degradation as well as other important functions have been applied in many fields. It is known that the introduction of anionic hydrophilic groups in the polymer enhances its adhesion to substrates and protective function. In the present work, copolymers of styrene with acrylic, methacrylic and itaconic acids were prepared by polymerization in toluene with benzoyl peroxide initiation (BPO) and have been tested as anticorrosive films. The copolymers were analyzed by FTIR and TGA methods. Polarizing microscope images were employed to characterize the anticorrosive properties of the formed films. All copolymers produced in this work show strong adhesion to the substrate. (C) 2010 Elsevier B.V. All rights reserved.
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    Effect of Unsaturated Keto-Groups on Physico-Mechanical and Thermal Properties of Modified Polystyrene
    (WILEY-BLACKWELL, 2011) Cerit, Alaaddin; Ahmetli, Gulnare; Kurbanli, Refika
    Polystyrene (PS), after polyolefins, is the most widespread polymer both in industry and daily life, successfully replacing some natural raw materials. In this study, as a serial of our previous study, modified polystyrene containing acetyl group (CH3CO-) was used as a raw material and condensation reaction was performed in basic medium with aliphatic saturated and unsaturated aldehydes. The structures of modified polystyrenes with unsaturated keto-groups were investigated by chemical and spectral (FTIR vs. H-1 NMR) analyses. The effect of the functional groups bound to the structure of the polymer on physicomechanical and thermal properties of modified polystyrene was investigated. As a result, condensation products of modified polystyrenes with crotonaldehyde and cinnamaldehyde had higher physicomechanical properties and were more stable against the thermal destruction at high temperatures. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 1193-1202, 2011
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    Recycling studies of marble processing waste: Composites based on commercial epoxy resin
    (WILEY-BLACKWELL, 2012) Ahmetli, Gulnare; Dag, Mustafa; Deveci, Huseyin; Kurbanli, Refika
    Marble waste was obtained from marble processing plant wastewater with precipitation using different coagulants, such as sepiolite, zeolite, and pumice in dosages of 0.58 g/500 mL and mixed in 20 wt % with commercial epoxy resin. The effects of marble, coagulant type and dosage on the physicomechanical and thermal properties were investigated. The incorporation of marble processing waste particles increases the 10% decomposition temperature of pure epoxy by 550 degrees C. Surface hardness, tensile strength, percentage elongation, and stress at maximum load of the composites were higher than those of pure resin, too. The composites reinforced with marble processing waste-pumice showed about 10% increase in elastic modulus, whereas the composite reinforced with marble processing waste-sepiolite or zeolite showed about 76.67143.33% increase in elastic modulus over the pure epoxy matrix. Scanning electron microscopy (SEM) was used for characterization of surface and cross sections of the composites to verify the results. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012