Global ETD Search
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 11 of 11 for “"polymer powder"”.
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The development and characterization of lightweight (CA,MG) ceramics
… of less than 0.35 by the polymer foam technique, and higher than 0.35 by the polymer powder technique. The polymer powder method forms an inhomogeneous pore structure having average pore sizes of 30-80 μm compared with the polymer foam method, which yields a large and …
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The fabrication of carbon-fiber composites by aqueous suspension prepregging with larc-tpi and peek
… prepregs with aqueous suspension of polymer powder and AS-4 carbon fibers. The prepregging, consolidation, and laminate evaluation procedures are described in this report. The need and importance of a dispersing and binding agent and its interactions with the composite matrix are …
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High performance thermoplastic matrix composite processing: dry powder prepregging, plasma treatment, consolidation/crystallization analysis
… this interest lies in the use of thermoplastic polymers as the composite matrix. Thermoplastics offer the potential of improved mechanical performance, greater solvent resistance, better impact tolerance, as well as cost saving processing attributes such as infinite shelf life, the ability to be …
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Economic and technological advantages of using high speed sintering as a rapid manufacturing alternative in footwear applications
… sintering uses infrared energy to 'flash' the polymer powder at multiple points making the layer deposition process much more time efficient. In effect each infusion of energy results in an entire layer being constructed rather than a single point. One of the first industrial applications for …
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Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet
The ultimate goal of this work was to optimize a polymer flame deposition process by developing an experimentally verified numerical model of it. This process consisted of injecting a polymer powder into an air/propane flame where the powder was heated enough to soften it before it was projected on …
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Characterization of polymeric membranes: sulfonated polysulfones
… bulk water. The surface of the membrane and the polymer powder was found to be different by ESCA analysis, and were also different from the bulk of the material. Neither the membrane surface nor the polytner powder surface had the same stoichiometry as the bulk. Ion exchange occurred not only on …
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Polymer pyrolysis and oxidation studies in a continuous feed and flow reactor : cellulose, polystyrene, and polyethylene
… combustion in thermal oxidation of common polymers. Solid polymer powder (cellulose,polystyrene, or polyethylene) is fed continuously into a volatilization oven where it fragments and vaporizes under continuous steady state conditions. The gas phase polymer fragments flow directly into a …
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Modeling Heat Transfer and Densification during Laser Sintering of Viscoelastic Polymers
… laser surface heating to induce consolidation of powdered materials. This work investigates some of the process-structure-property relationships for LS of viscoelastic polymers. A one-dimensional closed-form analytical solution for heating of a semi-infinite body, with a convective boundary …
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Additive manufacturing of polyolefins via powder bed fusion
Powder bed fusion (PBF) is an additive manufacturing (AM) process in which a fine polymer powder is selectively heated and melted using infra-red (IR) energy from a CO2 laser to melt the powder and coalesce the molten polymer together to form each layer. Semi-crystalline polymers are the most …
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Betony na bázi reaktivních prášků (RPC) s redispergovatelnými práškovými polymery
… prášků (RPC) s redispergovatelnými práškovými polymery“ se zabývá popisem, návrhem a vývojem materiálu se zvýšenou balistickou odolností, tedy se zvýšenou odolností proti vysokorychlostnímu dynamickému namáhání v důsledku interakce s projektilem. Vysokých mechanických vlastností je u RPC …
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Možnosti využití siliky pro výrobu polymery modifikovaných malt
… využití pucolánově aktivních příměsí pro polymery modifikované malty. Sleduje vlastnosti modifikované malty s částečným nahrazením cementového pojiva pucolánově aktivními materiály, ale i vliv přídavku redispergovatelných polymerních prášků do malt. Zvolená kritéria pro hodnocení a …