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ÇAKIR, MUSTAFA

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Author: AKIN, EMRE × Subject: Mühendislik, Bilişim ve Teknoloji (ENG) ×

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Now showing 1 - 7 of 7
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    Synthesis and Characterization of Flexible Butadien Containing Resin for 3D SLA Printers
    (2022-10-15) AKIN, EMRE; ÇAKIR, MUSTAFA; Akın E., Çakır M., Berberoğlu B.
    As well known, epoxy acrylate resins have been widely used in 3D SLA printers applications. Epoxy acrylate system consisted of bisphenol-A glycerolate diacrylate (epoxy acrylate resin) and 1,6-Hexanediol diacrylate (HDDA, reactive diluent resin) were used in this study. The weight ratio of epoxy acrylate and HDDA was determined as 1/1. The purpose of this study is to develop a novel epoxy acrylate system for 3D SLA printers and observe its properties. For this reason, a novel urethane acrylate was synthesized as reactive resin and was added into epoxy acrylate system with various weight percents. In order to obtain this novel urethane acrylate resin, hydroxyl terminated butadien oligomer was used as backbone of the chain while isophorone diisocyanate (IPDI) and 2-Hydroxyethyl methacrylate (HEMA) were used for synthesizing urethane acrylate functional groups. The addition of this novel reactive resin was carried out up to 1.5 %. Mechanical and physical tests were applied to the produced samples such as tensile, Shore-D hardness, abrasive and density tests. Considering of the results, substantial increases were observed in terms of tensile modulus. As expected, tensile strain values presented large decreases. Shore-D hardness and densities presented slight increases. Moreover, taber abrasive resistances of the produced novel samples presented considerable increases.
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    Urethane acrylate and silicon acrylate containing novel epoxy acrylate systems for sla 3d printers
    (2022-10-03) AKIN, EMRE; ÇAKIR, MUSTAFA; Çakır M., Akın E., Berberoğlu B.
    As well known, epoxy acrylate resins have been widely used in 3D SLA printer applications. Epoxy acrylate systems have generally consisted of bisphenol-A glycerolate diacrylate (epoxy acrylate resin) and 1,6-Hexanediol diacrylate (HDDA, reactive diluent resin) in various weight percents. The purpose of this study is to develop novel epoxy acrylate systems without HDDA and investigate their properties. For this reason, two different reactive resins were used instead of HDDA in epoxy acrylate systems with various weight percents. One of these resins was urethane acrylate resin that was synthesized in our laboratory. Urethane acrylate resin was synthesized using monomeric aliphatic diisocyanate (commercial name; Desmodur H) and 2-Hydroxymethyl methacrylate (HEMA). The other reactive resin was mixture of silicone acrylate and photoinitiator (commercial name; TEGO RC 1002). These resins were added into epoxy acrylate resin in various weight percent such as 20%, 40%, 60% and 80%. Tensile, izod impact, shore-D hardness, taber abrasive, density and DSC tests were applied to these produced samples. Considering of the results, urethane acrylate containing epoxy acrylate system exhibited much more improved results compared to pure epoxy acrylate system and silicon acrylate containing epoxy acrylate systems. It also exhibited more enhanced properties than epoxy acrylate systems with HDDA. It exhibited substantial increases in terms of tensile strength, modulus and izod impact resistance. Moreover, they presented more enhanced abrasive resistance. Shore-D hardness values and densities showed almost no change. This synthesized urethane acrylate reactive resin can be used in applications that required higher mechanical and abrasive properties for epoxy acrylate systems of 3D SLA printers.
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    PublicationOpen Access
    Multi-featured epoxy composites filled with surface-modified PTFE powders treated by Na-naphthalenide system
    (2023-01-01) AKIN, EMRE; ÇAKIR, MUSTAFA; DEMİRER, HALİL; AKIN E., ÇAKIR M., DEMİRER H.
    This study aimed to produce new multi-featured epoxy composites that are advanced in terms of mechanical properties, wear and impact resistance, and glass transition and heat deflection temperatures. Epoxy composites filled with chemically surface-treated poly (tetrafluoroethylene) (PTFE) powders at various ratios were prepared to obtain these improved properties. The chemical treatment was carried out via a Na-naphthalenide system. After this treatment, the x-ray photoelectron spectroscopy results presented the existence of functional groups such as OH, carbonyl groups, and C=C unsaturation points on the surface of the PTFE powders. On the PTFE surfaces, while the atomic ratios of carbon and oxygen were substantially increased, the fluorine ratio presented a significant decrease after the chemical treatment. However, the wear rates of the novel composites were highly advanced despite this large decrease in the fluorine ratio on the surface of the PTFE powders. Moreover, functional groups such as OH, carbonyl groups, and C=C unsaturation points and spongelike or network structures on the PTFE surfaces provided the opportunity to obtain strong adhesion and interfacial bonding between the surface-modified PTFE powders and the matrix. Strength and modulus values showed substantial enhancement besides the IZOD impact resistance. All glass transition and heat deflection temperatures were also substantially improved.
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    Synthesis and characterization of flexible polydimethylsiloxane containing resin for 3D SLA printers
    (2021-10-15) ÇAKIR, MUSTAFA; AKIN, EMRE; Akın E., Çakır M., Berberoğlu B.
    As well known, epoxy acrylate resins has been widely used in 3D SLA printers applications. Epoxy acrylate system that consisted of bisphenol-A glycerolate diacrylate (epoxy acrylate resin) and 1,6-Hexanediol diacrylate ( HDDA, reactive diluent resin) were used in this study. The weight ratio of Bisphenol-A glycerolate diacrylate and HDDA was determined as 1/1. The purpose of this study is to develop a novel epoxy acrylate system for 3D SLA printers and observe its properties. For this reason, a novel polydimethylsiloxane containing urethane acrylate was synthesized as reactive resin and added into epoxy acrylate system with various weight percents. It is also well known that polydimethylsiloxanes increase thermal properties of polymer materials. In order to obtain this novel reactice urethane acrylate resin, hydroxyl terminated polydimethylsiloxane was used as backbone of the chain while isophorone diisocyanate (IPDI) and 2-Hydroxyethyl methacrylate (HEMA) were used for synthesizing urethane acrylate functional groups. The addition of this novel reactive resin was carried out up to 1.5 % into epoxy acrylate system. Mechanical and physical tests were applied to the produced samples such as tensile, Shore-D hardness, abrasive and density tests. Considering of the results, tensile strength and modulus exhibited substantial increases while tensile strain presented large decreases. Taber abrasive resistance showed considerable increases. While Shore-D hardness of the produced novel materials presented slight decreases, the densities showed almost no change
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    PublicationOpen Access
    Mechanical and thermal properties of fumed silica-incorporated silane-terminated urethane/epoxy-interpenetrating polymer network nanocomposites
    (2024-01-01) AKIN, EMRE; ÇAKIR, MUSTAFA; KARTAL, İLYAS; AKIN E., ÇAKIR M., KARTAL İ.
    In this study, it was aimed to improve the mechanical and thermal properties of epoxy materials based on diglycidyl ether of bisphenol-A-based. For this purpose, three different nanocomposite materials were prepared at various ratios including a fumed silica nanoparticle-reinforced epoxy nanocomposite (FSN), an epoxy/silane-terminated urethane (STU) hybrid interpenetrating polymer network (IPN) nanocomposite (SHIN), and a fumed silica-reinforced epoxy/STU hybrid IPN nanocomposite (FSHIN). While synthesizing SHIN, 3-isocyanato propyl trimethoxy silane (ICPTMS) and poly (hexamethylene carbonate) diol were used. The synthesized STU polymer chains were crosslinked by reacting them with TEOS via the sol–gel process. Therefore, hybrid networks were obtained. Moreover, fumed silica nanoparticles were incorporated into the hybrid networks via the sol–gel process for FSHINs. The three different nanocomposite materials exhibited much more improved properties than the neat epoxy. The most prominent nanocomposite was FSHIN. In comparison with the neat epoxy, Young\"s modulus, ultimate tensile strength, and Izod impact resistance values increased at ratios of 53%, 50%, and 223%, respectively. Glass transition temperature values and char yield values increased substantially in all nanocomposites. However, thermal decomposition temperatures increased only for FSNs. Moreover, these values for FSHINs that were very close to those of the neat epoxy were considerably higher than those of SHINs. Highlights: Fumed silica-incorporated silane-terminated urethane/epoxy IPN nanocomposites. Substantially improved mechanical properties and impact resistance. Improved thermal stability.
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    PublicationOpen Access
    Mechanical properties of carbon-aramid hybrid fiber-reinforced epoxy/poly(vinyl butyral) composites
    (2023-01-01) ÇAKIR, MUSTAFA; AKIN, EMRE; ÇAKIR M., AKIN E., Renda G.
    Currently, it is important to manufacture fiber-reinforced epoxy matrix composites with high impact resistance besides their high strength and modulus values for industries such as automotive, aerospace, and aviation due to the brittle structure of epoxy. In this regard, we found the attractive results of the 0.5 wt% poly(vinyl butyral) (PVB)-containing epoxy blend in terms of strength, Young\"s modulus, and impact resistance. These results substantially motivated us to manufacture fiber-reinforced advanced epoxy/PVB matrix composites with 30–60 vol% carbon-aramid fiber ratios. Flexural (three-point bending) and tensile tests were performed to obtain strength and modulus values by measuring the force required to break the fiber-reinforced composite specimens and elongation at break points. Interlaminar shear strength tests were performed by the short beam bending method by measuring the resistance of the composite to delamination. The Charpy impact test was used to measure the energy absorbed during crack formation and fracture propagation. The composites with PVB were generally superior to those without PVB (EPCs). Two types of findings were observed. First, PVB increased the tensile and flexural strength values substantially for the 30 and 40 vol% ratios, but the modulus values slightly decreased. Second, PVB also substantially increased the modulus values for the 50 vol% ratio besides the strength values. It was thought that this result could be attributed to the increase in the compatibility of the fiber/matrix for the 50 vol% ratio. These decreases for EPCs could be derived from the micro-cracks and weaker interface between fiber and matrix.
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    Preperation and characterization of novel modified graphene oxide reinforced nanocomposite materials by sla 3D printer
    (2022-10-02) AKIN, EMRE; ÇAKIR, MUSTAFA; Akın E., Çakır M., Berberoğlu B.
    As well known, epoxy acrylate resins have been widely used in SLA 3D printers applications. Epoxy acrylate systems have generally consisted of bisphenol-A glycerolate diacrylate (epoxy acrylate resin) and 1,6-Hexanediol diacrylate (HDDA, reactive diluent resin). The purpose of this study is to develop novel epoxy acrylate systems for 3D SLA printers and observe the properties of produced materials. For this reason, novel modified graphene oxide phases were synthesized. First, graphene oxide was synthesized by Hummers method. Then aromatic diisocyanates (TDI;toluendiisocyanate and IPDI; isophorone diisocyanate) and 2-Hydroxyethyl methacrylate (HEMA) were reacted with graphene oxides in THF solvent. These modified graphene oxide solutions were entegrated into epoxy acrylate system. Tensile, izod impact resistance, shore-D hardness, abrasive and density tests were applied to the produced materials. Considering of the results, substantial increases were observed in terms of tensile strength and modulus, izod impact resistance, taber abrasive resistance and shore-D hardness. Moreover, densities of the produced novel samples presented considerable increases.