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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 67 for “"Polylactic acid"”.
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Polylactic Acid-Based Polymer Blends for Durable Applications
… that has received a great deal of attention is polylactic acid (PLA). In the past, this material was used mainly in medical or specialty applications, but advancements in manufacturing have led to a desire to use PLA more widely, especially in durable applications. Unfortunately, PLA has several …
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Degradation of polylactic acid in the presence of microsize and nanosize fillers
Polylactide (PLA)-cationic (montmorillonite, MMT) and anionic (hydrotalcite, HT) clay micro- or nanocomposites based on semicrystalline and amorphous polymers and unmodified and organomodified as well as calcined or non-calcined clays at 5wt% concentration are produced by melt mixing. Depending on …
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A study of the manufacturing and product possibilities of a cork/polylactic acid compound
… manufacturing and product capabilities of a cork/polylactic acid compound was conducted. Fine granulated cork, 1mm in diameter, was compounded with Natureworks' IngeoTM3051D PLA and extruded into pellets. The PLA was compounded with cork in two concentrations: 5% by weight and 10% by weight. The …
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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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Polylactic Acid based Blends and Composites for Material Extrusion 3D Printing: Formulation, Characterization, and Processing
In this PhD thesis, the objective was to develop polylactic acid/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends and their composites containing cellulose nanocrystals (CNCs), suitable for material extrusion 3D printing. In the first part, epoxidized canola oil (ECO), was utilized as a …
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Polylactic acid/thermoplastic tapioca starch blend incorporated with selected essential oils for active food packaging
… 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 glycerol and water and compatibilising …
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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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Investigation of the application of polylactic acid-calcium phosphate composite materials as novel periodontal barrier membranes
… this thesis was to investigate the potential of polylactic acid-calcium phosphate (PLA-Ca P) composite materials to be developed into a GTR membrane with increased potential for producing periodontal regeneration. Ca P materials included nano-hydroxyapatite (n-HA) and ß tri-calcium phosphate …
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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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Growth behavior of fibroblasts influenced by small changes in polymer structure
… cell growth on polyarylates with that of polylactic acid in their original state or by introducing small changes in the surface structure of the polymers, by adopting different processing techniques (i.e. drawn and undrawn forms). Though, it is the most widely used scaffold, polylactic …
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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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Low Dose, Low Disturbance: PET and PLA Microplastics Show Limited Effects on Soil Microbes via PLFA Analysis
… soil organic carbon (SOC), and other parameters. Polylactic acid (PLA) or polyethylene terephthalate (PET) powders were added to the soil to achieve a mass concentration of 0.7% and 0.6% w/w plastic to soil, respectively. This concentration was selected to be representative of pristine or natural …
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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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Estudio de prefactibilidad para la instalación de una planta productora de bolsas biodegradables a partir de ácido poliláctico
… a biodegradable bag plant was born, from polylactic acid, a biopolymer that ensures that the absolute degradation of the product occurs in a shorter time than conventional bags and above all makes use of renewable resources such as corn. Also, the growing concern of people for the care of …
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Abiotic and Biotic Polymer Degradation to Inform Sustainable Design
… commercially available bio-based polymers (e.g., polylactic acid, poly-3-hydroxybutyrate), and conventional fossil-derived polymers (e.g., polypropylene, polyethylene terephthalate). Results illustrate that current biodegradation standard methods relying only on mineralization underestimate …
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Modification of Fused Filament Fabrication Printer to Print High Temperature Thermoplastics to Improve Z-Strength
… tested. The tensile and flexural properties of polylactic acid (PLA), polyetheretherketone (PEEK), polyetherketoneketone (PEKK) and polyetherimide (PEI) were evaluated. The goal of developing the desktop 3D printer to print high temperature materials equivalent to high end printers was achieved. …
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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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