Browsing by Subject "Polymer matrix composites"

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    Preparation and mechanical characterization of chicken feather/PLA composites
    (John Wiley and Sons Inc., 2017) Baba B.O.; Özmen U.
    Green composites, a bio-based polymer matrix is reinforced by natural fibers, are special class of bio-composites. Interest about green composites is continuously growing because they are environment-friendly. This study describes the preparation and mechanical characterization of green composites using polylactic acid (PLA) matrix including chicken feather fiber (CFF) as reinforcement. Extrusion and an injection molding process were used to prepare CFF/PLA composites at a controlled temperature range. CFF/PLA composites with fiber mass content of 2%, 5%, and 10% were manufactured. The effects of fiber concentration and fiber length on mechanical properties of CFF/PLA composites have been studied. Mechanical properties of composites were investigated by tensile, compression, bending, hardness, and Izod impact testing. The results of experiments indicated that Young's modulus, compressive strength, flexural modulus, and hardness of the PLA reinforced CFF composites are higher but tensile strength, elongation at break, bending strength and impact strength of them are lower than pure PLA. The results indicate that these types of composites can be used for various applications. POLYM. COMPOS., 38:837–845, 2017. © 2015 Society of Plastics Engineers. © 2015 Society of Plastics Engineers
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    Investigation of mechanical behavior of polymer encapsulated liquid crystal composites
    (Institute of Physics Publishing, 2019) Kemiklioǧlu U.; Kemiklioglu E.
    In this study, the mechanical properties of polymer-liquid crystal composite films have been investigated as a function of changing polymer concentration. Nematic liquid crystal was encapsulated in waterborne polymer matrix of the polymer-liquid crystal composite films. The mechanical tests were carried out applying three- point bending tests on these films and the experimental results showed that the bending strength increases with the increasing polymer matrix concentration. The effects of the bending strength and polymer concentration on the morphological behaviors of these droplets were examined by using Scanning Electron Microscopy (SEM). The morphological and mechanical tests showed that the bending strength decreased with the increasing size and density of the waterborne encapsulated liquid crystal droplets. © 2019 IOP Publishing Ltd.
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    Hexagonal Boron Nitride/PCL/PLG Coatings on Borate Bioactive Glass Scaffolds for Bone Regeneration
    (Springer, 2022) Ensoylu M.; Deliormanlı A.M.; Atmaca H.
    In this study, hexagonal boron nitride (hBN) nanoparticle- containing (0.1–2 wt%) polycaprolactone (PCL) and polylactic-co-glycolic acid (PLG)-coated 13-93B3 borate-based porous bioactive glass composite scaffolds were prepared by polymer foam replication method and their ability to use in bone tissue engineering applications was assessed. Morphological, mechanical properties, cytotoxicity and the drug release behavior of the prepared composite scaffolds were investigated. In vitro bioactivity was tested in simulated body fluid and results were analyzed using FTIR spectrometer and SEM. Results showed that both polymer coating and the existence of hBN nanoparticles in the polymeric matrix improved the compressive strength of the fabricated composite scaffolds. Incorporation of the hBN nanoparticles enhanced the in vitro hydroxyapatite forming ability of the glass composites. Results also revealed that prepared bioactive glass based composite scaffolds showed no toxicity to MC3T3-E1 cells under in vitro conditions up to 72 h and hBN-containing glass scaffolds showed higher gentamicin sulfate release rates compared to the bare polymer coated scaffolds. Manufactured bioactive glass scaffolds containing hBN nanoparticles are found to be promising for bone repair and regeneration. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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    Two-dimensional molybdenum disulfide/polymer-coated bioactive glass scaffolds for tissue engineering: Fabrication, structural, mechanical, bioactivity, and radiation interaction properties
    (Elsevier Ltd, 2023) Deliormanli A.M.; Ensoylu M.; ALMisned G.; Tekin H.O.
    Molybdenum disulfide (MoS2)-based nanostructures are widely used in environmental protection and biomedicine owing to their biological, physical, chemical, electrical, and mechanical properties. In this study, polycaprolactone (PCL)- and polylactide-co-glycolide (PLGA)-coated bioactive glass scaffolds containing MoS2 nanoparticles are prepared, and their usability in bone tissue engineering applications is evaluated. Borate bioactive glass scaffolds are fabricated using the replication method and coated with PCL or PLGA solutions (5 wt%) containing MoS2 (0.1, 0.2, 0.5, 1, and 2 wt%) nanoparticles. The structural and mechanical properties of the scaffolds and their bioactivity in simulated body fluids are investigated comprehensively. The ionization–radiation-shielding properties are investigated using Monte Carlo simulations. The results show that the polymer coating layer and presence of MoS2 nanoparticles in the polymer matrix improves the mechanical properties of the scaffolds. The addition of MoS2 nanoparticles to the structure increases the hydroxyapatite-forming ability of bioactive glass-based composites. Additionally, the prepared composite scaffolds exhibit high radiation-shielding ability owing to the presence of MoS2 nanoparticles embedded in the polymer matrix that shields the glass surface. Bioactive glass composite scaffolds containing MoS2 nanoparticles demonstrate promising potential for bone regeneration and radiation-shielding applications. © 2023 Elsevier Ltd and Techna Group S.r.l.