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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Polylactic acid (PLA)"”.
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Synthesis and Characterization of Linear and Branched Polylactic Acid for Use in Food Packaging Applications
<p>Polylactic acid (PLA) resins of various molecular weights and molecular weight distributions were synthesized. Linear, narrow molecular weight distribution (MWD) PLA resins were synthesized, as well as resins containing both high molecular weight branched structures and low molecular weight …
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Modification of Fused Filament Fabrication Printer to Print High Temperature Thermoplastics to Improve Z-Strength
… process is inherently a non-isothermal thermoplastic welding process that leads to anisotropic material properties. A non-traditional method to improve the strength using an infrared quartz heater as a pre-deposition heating system was developed and tested. The tensile and flexural properties …
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Development of High-Strength Composites with Sustainable Fibers for Structural Applications
… were applied to improve fiber compatibility with polylactic acid (PLA). Both untreated and treated fibers at 10% loading were blended with PLA and extruded into 3D printable filaments. Results showed that MA-treated fiber-based composites had around 15% higher tensile strength and modulus, along …
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Development and evaluation of the innovative 3D printed scaffolds for bone regeneration in vitro and in vivo /
… porosity of 3D scaffolds printed from industrial polylactic acid (PLA) filaments with different FDM 3D printers. Innovative topologically ordered 3D scaffolds were created using the combination of hot melt extrusion and FDM technologies from PLA micro granules, PLA and hydroxyapatite or PLA and …
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Cellulose Nano Fibers Infused Polylactic Acid Using the Process of Twin Screw Melt Extrusion for 3d Printing Applications
… thesis, cellulose nanofiber (CNF) reinforced polylactic acid (PLA) filaments were produced for 3D printing applications using melt extrusion. The use of CNF reinforcement has the potential to improve the mechanical properties of PLA, making it a more suitable material for various 3D printing …
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A tissue-engineered approach to hernia repair
… mesh). Solutions of polycaprolactone (PCL) or polylactic acid (PLA), two aliphatic polymers commonly used in various clinical applications, were individually mixed with irgasan (IRG) (an antibacterial agent) or levofloxacin (LEVO) (a broad-spectrum antibiotic). Type I collagen was later …
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Creation of controlled polymer extrusion prediction methods in fused filament fabrication. An empirical model is presented for the prediction of geometric characteristics of polymer fused filament fabrication manufactured components
… process. Initial literature research showed that Polylactic Acid (PLA) is now in common use within the field of FFF and therefore was selected as the main working material for this project. The FFF technique, which combines extrusion and Computer Aided Manufacturing (CAM) techniques, has a …
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Characterizing and Real-Time Monitoring of Various Types of Waters and Wastewaters Contaminated With Algae, Recycled Plastic Powders, and Clay Using the New Electrical Methods With Vipulanandan Models
… conditions. Six representative samples of algae, acidic algae, nitric acid (0.1 M), sodium hydroxide (0.1 M), polylactic acid (PLA), and bentonite clay were prepared in four concentrations and monitored over ten days, generating seventy-two datasets. Physicochemical parameters, including pH, EC, …
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In-situ Thermal and Deformation Characterization of Additive Manufacturing Processes
… prints. In addition, polymeric structures using polylactic acid (PLA) were analyzed using thermography and digital image correlation (DIC) to understand the interactions between the thermal variations and resulting deformation.</p> <p>The inclusion of a zero-bias deep neural network (ZBDNN) to …
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Low Dose, Low Disturbance: PET and PLA Microplastics Show Limited Effects on Soil Microbes via PLFA Analysis
<p>Observations of microplastics in terrestrial soils are increasing and their potential effects on soil microbial communities (and/or their diversity) are poorly understood. To understand how microplastics may affect soil communities, we performed a microcosm study using soil collected from a …
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Single Degree of Freedom Solid Rotor Velocity Control Induction Drive
… the stator and is supported by a 3D-printed polylactic acid (PLA) enclosure. The wiring is initially connected in wye configuration without a neutral wire but later converted to three independent phases, each with its own input and output wire. The teeth have a nominal air gap of 0.5mm with …
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Chemical Modification of Cellulose Fibers and their Orientation in Magnetic Field
… cellulose in a viscous polymer matrix such as polylactic acid (PLA) by applying the concepts of magnetism. Orientation of cellulose fibers in a PLA was achieved by modifying the cellulose fibers with a ferromagnetic entity and subjecting to a magnetic field. Chemically modified cellulose fibers …
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Ionic liquids as additives for biodegradable polyactic acid
… based cation were evaluated as potential plasticizers and lubricants for polylactic acid (PLA) and also for their effects on its hydrolytic and thermal degradation. Both ILs at 5wt% were well dispersible and partly miscible with PLA as evidenced by scanning electron microscopy/energy …
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Polylactic acid/thermoplastic tapioca starch blend incorporated with selected essential oils for active food packaging
… This work aimed at producing sustainable thermoplastic tapioca starch (TPTS) and its polylactic acid (PLA) blend with introduction of antimicrobial (AM) activity via incorporation of lemongrass (LG), lemon balm (LB) and pandan (PA) essential oils (EOs) on the films. The plasticising effect of …
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Hydraulic fracturing through 3D printing and lattice modelling
… of 3D printing on rock mechanics is explored by Polylactic acid (PLA) material, but its plastic property inhibits the direct simulation of rocks. Then, more brittle powder-based gypsum-like 3D printed specimens are successfully fractured by the split Hopkinson pressure bar (SHPB) system for …
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3D print quality in the context of PLA color
… in fused deposition modeling (FDM) printers is polylactic acid (PLA). One print quality concern is how different colors of PLA print differently under the exact same settings. The inconsistency in print quality by color is bad for designers, students, and engineers who want to rapidly prototype …
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Rheology of Foaming Polymers and its Influence on Microcellular Processing
… on low-density foaming behaviour of polylactic acid (PLA) are investigated. Understanding the rheological properties of foaming polymers allows the optimization of polymer chemical structure and the development of technologies that produce desired cell morphologies. Although the …
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Microwave ring resonator based on thermoplastic substrate for chicken breast meat quality identification application
… ring resonator (MRR) based on the thermoplastic substrate for meat quality identification. Recently, the quality of meat, especially chicken meat, has sparked an interest in both the producers and the consumers, due to the increasing trend of consumption of chicken meat as one of the …
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Characterisation and plastic-degrading potential of plastisphere-associated microorganisms
The versatility and affordability of plastics have contributed to their largely unrestricted production, increasing from two million tons (Mt) in 1950 to roughly 400 Mt per annum in 2022. Consequently, plastic waste is accumulating in the environment, where its degradation is slow, impacting …
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Characterization of Hydrophobically Modified Titanium Dioxide Polylactic Acid Nanocomposite Films for Food Packaging Applications
… nanoparticles and hydrophobic polymers such as polylactic acid (PLA) causes problems due to the tendency of TiO2 nanoparticles (TiO2) to agglomerate and form large clusters. A surface modification of TiO2 with long chain fatty acid may improve the compatibility between PLA and TiO2. The goal of …
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