Browsing by Author "Temiz, M."

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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.