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 20 of 418 for “"thermoplastic"”.
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Thermoplastic composite consolidation
… and time to the interply intimate contact of thermoplastic composites. The model was developed by integrating a prepreg surface topology characterization with a resin flow analysis. Both unidirectional and cross-ply lay-ups were modeled. Two-ply unidirectional laminae fabricated from …
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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic composites
… autohesive strength development in amorphous thermoplastic resins and fiber-reinforced thermoplastic prepregs. All tests were performed using polysulfone P1700 thermoplastic resin and AS4/P1700 graphite-polysulfone prepreg. Two test methods were examined to measure autohesion in neat resin …
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Foaming Novatein thermoplastic protein
… can be denatured and plasticised to produce thermoplastic materials. Novatein Thermoplastic Protein (NTP) is a patented blend of blood meal (a highly aggregated protein) and processing additives which: reduce hydrogen bonding, break cross links between cysteine residues, disrupt hydrophobic …
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Thermoplastic-based pyrotechnic compositions
… continuous manufacture via extrusion processes. Thermoplastic-based pyrotechnic compositions can be formulated by filling conventional polymer matrices with oxidants such as potassium nitrate. More interesting are fluoropolymer matrices as these strong oxidants enable the design of non-gassing …
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Biorenewable polymer thermoplastic biocomposites
<p>Biorenewable fillers have recently gained a greater focus in research to produce composites because of their unique properties, abundance, and diversity. These biorenewable fillers can include various terrestrial based plants naturally grown throughout the world. The focus of this work was on …
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Development of Sustainable Thermoplastic Elastomers
… with targeted properties appropriate for thermoplastic elastomer applications. Well-defined polymers with desired compositions and controlled molecular weight distributions were successfully synthesized using reversible addition fragmentation chain transfer (RAFT) polymerization. SAS …
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Thermoplastic bonding of microfluidic substrates
… that are manufactured from commodity thermoplastics is challenging. A survey of plastic welding techniques validates that contour transmission laser welding is the most viable and commercially demonstrated option for flexibility and sensitive microfluidic tolerances. However, …
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Autohesion model for thermoplastic composites
A non-isothermal autohesion model was developed by combining a transient finite element heat transfer model with the isothermal autohesion model. Heat transfer analyses and the interfacial strength development analyses were conducted using the non-isothermal autohesion model on a polysulfone (Udel …
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Pultrusion of commingled thermoplastic composite materials
The work involves the analysis and verification of the pultrusion process. The pultrusion machine at UNLV was improved by modifying the consolidation and the cooling system. A comparative study of the material properties of the pultrusion process and the compression molding were done with the …
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Fully-renewable and degradable thermoplastic elastomers.
… the investigation of completely-biorenewable thermoplastic elastomers. Polymenthide (PM), a soft biorenewable polymer derived from (-)-menthol, is immiscible with PLA and was utilized as the middle block in a PLA-containing ABA triblock copolymer. Tensile measurements demonstrated impressive …
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Biodegradable Thermoplastic Elastomers and Smart Composites
<p>There is a need for biodegradable thermoplastic elastomers for a variety of medical applications. This dissertation aims at (i) developing and characterizing biodegradable elastomers and (ii) developing and characterizing biodegradable smart composites, both to be used as biomaterials. First, in …
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Nanotube reinforced thermoplastic polymer matrix composites
… with single wall nanotube (SWNT) reinforced thermoplastic polymer composites. The two studies demonstrate the effect of solid freeform fabrication (SFF) and chemical functionalization on anisotropy and limited reactivity, respectively. Both studies showed mechanical property improvements. The …
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Development of hydrophobic thermoplastic starch composites
… within the glycerol plasticized matrix formed by thermoplastic cornstarch biopolymer. The function of starch-based polymers is limited due to poor mechanical properties. However, it is improved with forming a biocomposite of thermoplastic starch (TPS) as matrix and the cellulose fibers (CF) as …
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Migration of additives from thermoplastic polymers
A homologous series of ultra-violet stabilisers containing 2-hydroxybenzophenone (HBP) moiety as a uv absorbing chromophore with varying alkyl chain lengths and sizes were prepared by known chemical synthesis. The strong absorbance of the HBP chromophore was utilized to evaluate the concentration …
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Ultrasonic Welding of Glassy Thermoplastic Polymers
Ultrasonic welding of thermoplastic polymers has been practiced industrially for many years without being fully understood. This study includes an analysis of the energy dissipation mechanisms responsible for the formation of ultrasonic welds in PMMA including viscoelastic loss and by plastic …
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Hot micro-embossing of thermoplastic elastomers
… to the curing process used to fabricate devices. Thermoplastic elastomers (TPEs) provide a potential alternative to PDMS. Soft and rubbery at room temperature, TPEs become molten when heated and can be processed using traditional thermoplastic fabrication techniques such as injection molding or …
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The nucleation of microcellular thermoplastic foam
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Ultrasonic welding of advanced thermoplastic composites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Solid-state processing of thermoplastic polymers
Although compaction and sintering of polymeric powders has been investigated since the early 1970's, this processing method is not widely used, possibly because the fundamental mechanisms which control compaction and sintering have never been fully understood. This study has made significant …
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Thermoplastic prepreg manufacture by solution impregnation
Advanced thermoplastic composites are commonly manufactured from "'prepreg" materials, where the reinforcing fibers are preimpregnated with resin. The objectives of this investigation were to identify the critical parameters in impregnation of the fiber tow by a thermoplastic solution, and to …
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