Browsing by Author "Kocaman, S."

Now showing 1 - 4 of 4

Citation - WoS: 20
Citation - Scopus: 20
Evaluation of Epdm Waste in Environmentally Friendly Epoxy Hybrid Composites
(Korean Society of Industrial Engineering Chemistry, 2023) Temiz, M.; Kocaman, S.; Ahmetli, G.
This study aims to reduce the production cost of composite materials, obtain composite materials with improved properties, and expand the applications of waste rubber composites using two different industrial wastes, ethylene-propylene-diene monomer rubber (EPDM) and tire waste pyrolysis solid product carbon black (CB). Composites were formed by adding EPDM waste or EPDM-CB mixture at 1:1, 1:3, and 3:1 ratios to bisphenol-A type epoxy resin in different weight ratios. Mechanical, water sorption, electrical conductivity, and flammability tests were applied to the composites. The effect of the EPDM:CB ratio and some environmental conditions on the mechanical properties of the hybrid composites were investigated. Composites with 3:1 weight ratio of EPDM:CB had the highest tensile strength, which varied between 115.5–158.6 MPa. Increasing the EPDM ratio in an epoxy matrix and hybrid filler decreased the composites’ density and tensile strength. EPDM-CB hybrid filler increased the thermal strength of epoxy. Mechanical properties are affected by water sorption, low temperature, and UV irradiation. Increasing the CB ratio in the hybrid filler decreased the flammability of the hybrid composites. ANOVA is applied to find the significant effect of different weight percentages of hybrid fillers and different varieties of fillers on the mechanical properties of composites. © 2023 The Korean Society of Industrial and Engineering Chemistry
Citation - WoS: 13
Citation - Scopus: 14
Halogen-Free Boron-Based Hybrid System for Enhancing Flame Retardancy, Mechanical and Thermal Properties of Epoxy
(John Wiley and Sons Inc, 2024) Kocaman, S.; Temiz, M.; Işık, M.; Ahmetli, G.; Ceyhan, A.A.; Karakaya, Ş.
This study aims to increase the flame retardancy of epoxy-based composites by using various flame retardants together with colemanite filler (CLM), which is a very mineral-rich boron type. As a flame retardant, aluminum hydroxide (Al(OH)3) and boron-containing compounds: borax (BRX) and natural minerals (tincal (TNC) and colemanite (CLM)), as well as barium metaborate (BaMB) synthesized by us were used. Scanning electron microscopy (SEM), x-ray powder diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), contact angle (CA), and particle size analysis were used to characterize the composites and additives. All boron compounds increased the thermal stability of the composites. Except for the ER/CLM-BaMB composite, other composites' surface contact angles were over 90°. In terms of both combustion and thermal properties, the best CLM-BaMB-Al(OH)3-TNC ratio was determined as 15:5:15:15. The tensile strength, self-extinguishing time, estimated and experimental Limited Oxygen Index (LOI) values for this composite were determined as 96 MPa, 65 s, 29.6%, and 25%, respectively. In addition, ANOVA was applied to determine the effect of hybrid filler type and different weight ratios on the mechanical properties of composites. © 2024 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals LLC.
Citation - WoS: 8
Citation - Scopus: 8
Implementation of the Pecvd Process To Produce a Novel Range of Filler-Polymer Perlites for Use in Epoxy Composites
(Korean Society of Industrial Engineering Chemistry, 2023) Kara, A.S.; Ahmetli, G.; Karaman, M.; Kocaman, S.; Işık, M.; Gürsoy, M.
This study examines the use of expanded perlite powder (ExP), a natural rock, as reinforcement in bisphenol-A type epoxy resin. The surface of ExP has been coated using the PECVD method with different polymers such as poly(hexafluorobutyl acrylate) (PHFBA) and poly(glycidyl methacrylate) (PGMA). ExPs before and after the coating process underwent characterization using various techniques such as X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Scanning Electron Microscopy (SEM). The effects of filler ratio and different polymer coatings on composite properties were investigated. The higher tensile strengths for uncoated, PHFBA-coated, and PGMA-coated ExP composites were determined as 109 MPa, 132 MPa, and 152 MPa, respectively. The surfaces of the polymer-coated ExP composites were found to be hydrophobic and water sorption was lower in these composites. ExPs have improved thermal stability and flammability properties. In addition, PHFBA-coated ExP composite was found more resistant to UV radiation and the hydrothermal environment. © 2023 The Korean Society of Industrial and Engineering Chemistry
Citation - WoS: 27
Citation - Scopus: 30
Sustainable Production of Recycled Rubber Waste Composites With Various Epoxy Systems: a Comparative Study on Mechanical and Thermal Properties
(Elsevier B.V., 2023) Turkben, M.; Kocaman, S.; Özmeral, N.; Soydal, U.; Cerit, A.; Ahmetli, G.
In this study, ethylene-propylene-diene monomer rubber (EPDM) and tire waste powder (TW) were selected as filling materials for toughening various epoxy matrices, lowering composite materials costs and converting these wastes into valuable resources. Two types of bisphenol-A epoxy resins (ER1 and ER1diluted), and three types of epoxy resin blend systems with ER1diluted, CTBN rubber modified (ER2), and polyurethane modified (ER3) epoxies in 1:1 wt ratio were used as matrices. The effects of the rubber ratio and type, also the epoxy matrix on the composite properties were investigated. The TW composites' mechanical and thermal properties were higher than those of the EPDM composites. The best results for resin mixtures were obtained with ER3. The most suitable filling ratio of EPDM and TW varied between 20% and 30% by weight, depending on the matrix type. TW addition increased the impact strength of the ER1diluted and ER3-ER1diluted epoxy matrices. In terms of mechanical properties, the low ambient temperature was found to be more suitable than an aqueous medium. © 2023 Elsevier B.V.