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Articles 1 - 7 of 7
Full-Text Articles in Chemistry
Upcyclying Of Polyethylene Terephtalate By Addition Of Thermoplastic Elastomer, Diego Francisco Bermudez
Upcyclying Of Polyethylene Terephtalate By Addition Of Thermoplastic Elastomer, Diego Francisco Bermudez
Open Access Theses & Dissertations
Continual overconsumption of single-use plastics has generated challenges of solid waste management across the United States. Common plastic waste management solutions, such as landfill, have caused the migration of contaminants into the environment consequently affecting not only the health of wildlife, but also that of human beings. Alternative strategies for the handling of single-use plastic such as polyethylene terephthalate (PET), used in the food packaging industry, can ultimately help mitigate the noxious consequences of single-use plastics affecting entire ecosystems. This study demonstrates a potential avenue of materials upcycling by studying the effects of coupling PET with the thermoplastic elastomer styrene-ethylene-butylene-styrene …
Direct Ink Write And Thermomechanical Characterization Of Thermoset Composites, Sergio Dante Favela
Direct Ink Write And Thermomechanical Characterization Of Thermoset Composites, Sergio Dante Favela
Open Access Theses & Dissertations
This research will be divided into two sections. The first section discusses direct ink writing and thermomechanical characterization for thermoset composites. The thermoset ink is prepared with fillers aiding the printing process by modifying the rheology of the ink and geometry retention by allowing for the part to have an initial UV cure step. Three specimen formulations with different weight percentages were printed by material extrusion in the shape of tensile specimens following ASTM standard D638 to characterize the mechanical properties at room temperature, 100â?? and 200â??. Furthermore, the ink resin was characterized through DSC, TGA, and rheology testing. The …
Synthesis, Characterization, And Direct-Ink-Writing Of Syntactic Foams, Andrea Irigoyen
Synthesis, Characterization, And Direct-Ink-Writing Of Syntactic Foams, Andrea Irigoyen
Open Access Theses & Dissertations
This project encompasses three different methods to fabricate syntactic foams using a PDMS matrix i.e., hollow spheres inclusion, pore generator leaching by solvent, and emulsion. The foam formation by using polysiloxane hollow spheres is done in a 3-step process. The first step is to create a core of polystyrene following a dispersion polymerization process. The goal for the size of the pore is to monodisperse and have an average diameter of 5-10 ÃÂüm, so the polystyrene core must be as well within that range. After that, the cores are coated with a polysiloxane shell by following a polymerization by condensation …
Synthesis And Characterization Of Functiona Materials For 3d Printed Composites, Elizabeth Irene Reza
Synthesis And Characterization Of Functiona Materials For 3d Printed Composites, Elizabeth Irene Reza
Open Access Theses & Dissertations
The following body of work encompasses the synThesis, upscaling, additive manufacturing, and characterization of microspheres as functional fillers incorporated into polymer syntactic foams. Synthesizing microspheres permits control over morphology, dispersion of particles, and size while the use of direct write manufacturing allowed for the controllability of filler orientation. Two different syntactic foams were developed from similar methodologies: (1) a silicone syntactic foam (2) epoxy syntactic foam. The silicone epoxy foam showed an increasing in damping and elastic modulus. The epoxy syntactic foams showed an enhanced thermal and electrical properties.
Improving The Engineering Properties Of Pla For 3d Printing And Beyond, Carmen R. Rocha
Improving The Engineering Properties Of Pla For 3d Printing And Beyond, Carmen R. Rocha
Open Access Theses & Dissertations
Additive manufacturing (AM), now more commonly known as 3D printing, has been classified as efficient, fast, and practical in the prototyping sector of product development. In the work presented here, we will use one of the AM techniques known as Material extrusion 3D printing (ME3DP), which has all the advantages of AM. However, one of the biggest challenges facing ME3DP technologies is the limitation of the range of materials used by this technique. Acrylonitrile butadiene styrene (ABS) and poly-lactic acid (PLA) are currently the most common thermoplastics materials used in ME3DP because of their ability to melt and be reprocessed. …
Synthesis And Manufacture Of Photocrosslinkable Poly(Caprolactone)-Based 3d Scaffolds For Tissue Engineering Applications, Nathan Jonathan Castro
Synthesis And Manufacture Of Photocrosslinkable Poly(Caprolactone)-Based 3d Scaffolds For Tissue Engineering Applications, Nathan Jonathan Castro
Open Access Theses & Dissertations
It is known that the body can efficiently repair hard tissue (bone) micro fractures by suturing the defect through the deposition of minerals resulting in an area that is stronger post-injury. Larger defects, however, generally cause more trouble since the body is incapable of repairing them. Bone defects can occur as a result of congenital abnormalities, trauma, or disease. Traditional methods for addressing these defects have involved the use of acellular cadaverous bone or autologous bone. Both contain innate problems associated with them; the former method can result in disease transmission, as well as very low integration with the host …
Lipid Metal Organic Networks, Maria Eugenia Martinez
Lipid Metal Organic Networks, Maria Eugenia Martinez
Open Access Theses & Dissertations
Metal–organic frameworks (MOFs) first appeared in the literature in 1991 and consist of three dimensional structures constructed by linking transition metal ions together through highly directional bonding with organic ligands. MOF materials offer the ability to choose from variety of metal centers that allow the tailoring of optical or magnetic properties, as well as control, to some extent, the size of the coordination sphere. Another advantage is the numerous organic ligands form which suitable pore geometries may be constructed with customized functionality among many applications in other areas such a gas storage chemical separations and selective catalysis. The primary objective …