Effect of Printing Temperature on Mechanical and Viscoelastic Properties of Ultra-flexible Thermoplastic Polyurethane in Material Extrusion Additive Manufacturing

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dc.authorid0000-0002-3361-6528en_US
dc.authorid0000-0002-5488-533Xen_US
dc.contributor.authorGümüş, Ömer Yunus
dc.contributor.authorİlhan, Recep
dc.contributor.authorCanlı, Berat Enes
dc.date.accessioned2022-10-12T07:46:06Z
dc.date.available2022-10-12T07:46:06Z
dc.date.issued2022en_US
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Polimer Malzeme Mühendisliği Bölümüen_US
dc.description.abstractMaterial extrusion (ME) is one of the additive manufacturing methods and widely used to produce polymer-based parts. Thermoplastic polyurethane (TPU) is a relatively new material in ME. It has microdomains consisting of hard segments (HS) and soft segments (SS) in varying proportions. This structural complexity and weak interactions between HS and SS cause the properties of TPUs to become very sensitive to processing parameters such as temperature. In this study, the effect of printing temperature in a range of 170-250 degrees C on the physical, mechanical, and viscoelastic properties of ultra-flexible TPU (Shore A 60) samples was investigated. Furthermore, to elucidate the effect of the manufacturing method, a sample prepared by compression molding (CM) at 230 degrees C was used. Thermal transitions of the samples were analyzed by DSC. Increasing T-g values were observed in correlation with increased printing temperature. A relation between T-g and hardness values was thus established. In order to observe molecular weight (M) changes after printing, zero shear viscosities (eta(0)) of polymer solutions were examined and preserved M values up to 200 degrees C were detected. Mechanical properties of the samples were analyzed through tensile tests. Among the samples including CM, the highest tensile strength and elongation at break were 37.6 MPa and 921%, respectively, which was detected for the sample printed at 230 degrees C. Oscillation tests revealed that both entanglements and HS content influence storages modulus (G '). Among the printed parts, highest G ' value was measured at 220 degrees C printing temperature. This result was attributed to the synergistic effect of entanglement and HS. Furthermore, it is concluded that chain alignment has greater contribution on mechanical properties than M, whereas viscoelastic properties is more sensitive to M.en_US
dc.identifier.doi10.1007/s11665-021-06510-9en_US
dc.identifier.endpage3687en_US
dc.identifier.issn1544-1024
dc.identifier.issue5en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage3679en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12885/2066
dc.identifier.volume35en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.institutionauthorGümüş, Ömer Yunus
dc.institutionauthorİlhan, Recep
dc.language.isoenen_US
dc.publisherSPRINGERen_US
dc.relation.ispartofJOURNAL OF MATERIALS ENGINEERING AND PERFORMANCEen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectadditive manufacturingen_US
dc.subjecthardnessen_US
dc.subjectmaterial extrusionen_US
dc.subjectmechanical propertiesen_US
dc.subjectprinting temperatureen_US
dc.subjectTPUen_US
dc.subjectviscoelastic propertiesen_US
dc.titleEffect of Printing Temperature on Mechanical and Viscoelastic Properties of Ultra-flexible Thermoplastic Polyurethane in Material Extrusion Additive Manufacturingen_US
dc.typeArticleen_US

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