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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 24 for “"Engineering Polymers"”.
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Synthesis, properties, and modifications of engineering polymers
… poly(arylene ether sulfone) homo- and copolymers and related structures were systematically synthesized via nucleophilic, aromatic substitution reactions using the potassium carbonate/N-methylpyrrolidone synthesis route. In particular, deuterated poly(arylene ether sulfones) were …
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Synthesis and transformation reactions of engineering polymers
… The ketone containing tetramethyl bisphenol A polymers has been found to be a photocrosslinkable resin and hence a potential candidate as a negative photo-resist for electronic materials. Investigation of the thermal behavior of these polymers have indicated considerable interchain forces to be …
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Siloxane modified engineering polymers: synthesis and characteristics
… coupled, poly(imide siloxane) segmented copolymers were prepared and characterized. The copolymers were synthesized in two steps, the first involving the generation of soluble poly(amic acid) intermediates through reaction of various aromatic dianhydrides and aromatic diamines with a series …
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High Performance Engineering Polymers: Design, Properties, and Performance
The facile synthesis of engineering thermoplastics enabled the development of structure-morphology-property relationships for a wide range of applications. Utilizing step-growth polymerization techniques, a myriad of reaction conditions probed various polymer families including polysulfones, …
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Initiated chemical vapor deposition of polymeric thin films : mechanism and applications
… to deposit thin films of application-specific polymers in one step without using any solvents. Its uniqueness of in situ surface polymer synthesis distinguishes iCVD from conventional processes such as spin-on deposition and plasma-enhanced chemical vapor deposition. It allows engineering …
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Mechanics of large-strain deformation of particle-modified polymers
Over the past several decades, engineering polymers have become increasingly prevalent in the manufacture of virtually all types of products. Polymers are substantially less dense than metals, easy to machine, and readily formed into quite complex geometries. The properties of polymers may be …
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Micromechanics, macromechanics and constitutive modeling of the elasto-viscoplastic deformation of rubber-toughened glassy polymers
Glassy polymers, such as polystyrene (PS), poly(methyl methacrylate) (PMMA) and polycarbonate (PC), are common engineering polymers that have found uses in consumer products ranging from portable computers and optical lenses, to automotive components and appliance housings. PMMA and PS are …
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Development of a Acrylonitrile Butadiene Styrene toner for an electrophotography based additive manufacturing process
… and also the development of toners from tough engineering polymers. The aim of this study is to develop a suitable negatively charging engineering polymer for the Selective Laser Printing process and a more efficient method of generating toners with a suitable particle range and to assess the …
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Multiscale chemomechanics of polymer deformation under contact : predicting structure-property correlations from the bulk to the interphase
… the time-dependence and response of homogeneous engineering polymers under confined contact loading are characterized as a function of polymer physical and structural properties. The validity of the time-independent metric indentation hardness Hi is evaluated through the combination of …
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Synthesis and characterization of triphenylphosphine oxide containing monomers and high performance polymeric materials
… randomly segmented copolymers, and epoxy network systems. These uniquely designed monomers were prepared via both Friedel-Crafts and Grignard techniques. In particular, two arylene ether diamines, bis[4-(maminophenoxy)phenyl]phenylphosphine oxide (m-BAPPO) and …
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Investigating the Process-Structure-Property Relationships in Vat Photopolymerization to Enable Fabrication of Performance Polymers
… to poor scalability, and limited catalogue of engineering polymers. The challenges in scalability stem from an inherent process paradox: the feature resolution, part size, and manufacturing throughput cannot be maximized simultaneously in standard VP platforms. In addition, VP's inability to …
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Synthesis and characterization of phosphorus containing poly(arylene ether) systems
… also obtained. Physical blends and statistical copolymers, as well as polymers of controlled molecular weight and functionality, were also prepared via conventional techniques, yielding novel phosphorus containing compositions. Unique features of these poly (arylene ether phosphine oxide) s (PEPO) …
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Synthesis and Characterization of Wholly Aromatic, Water-Soluble Polyimides and Poly(amic acid)s Towards Fire Suppression Foams
… one of the most versatile high-performance engineering polymers. Polyimides are inherently mechanically robust, chemically inert, and thermooxidatively stable to 400+ °C depending on their chemical structure, enabling their function in numerous aerospace, electronic, medical, and …
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Thiol-Ene Click Chemistry for Solid State Triplet-Triplet Annihilation Upconversion and Parts-Per-Billion Pyrophosphate Sensing in Artificial Seawater
… chemistry is a robust approach to molecularly engineering polymers for many applications. Within this work, thiol-ene click chemistry is used to fabricate thiol-ene networks for TTA-UC and to synthesize a conjugated polyelectrolyte (CPE) used as a pyrophosphate (PPi) sensor in complex aqueous …
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Monomer synthesis and polymer pyrolysis
… char at temperatures where other engineering polymers are completely volatilized. This behavior was related to the superior self-extinguishing behavior of all the phosphorus containing systems. A detailed pyrolytic degradation study of the phosphorus containing PEPO system was …
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Physical and mechanical behavior of amorphous poly(arylene ether)ketone and poly(arylene ether)ketone modified bismaleimides
… 160°C. In the form of a thermoset, these polymers have potential usages as structural engineering matrix resins or adhesives, as well as modifiers for existing engineering polymers. Thermosets of PAEKs can be prepared through the incorporation of amine, maleimide, or nadimide groups onto …
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Materials selection for microsystems actuators
… at scales less than 100 ?m using engineering alloys. Although engineering polymers on Si are promising for high displacement electrothermal actuators, their low elastic moduli have to be compensated by a large thickness for an optimal performance. Pb based piezoceramics on Si/DLC …
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Advanced manufacturing of sustainable materials
… polymerization and depolymerization utilizing an engineering thermoplastic with a low ceiling temperature, cyclic poly(phthalaldehyde) (cPPA). cPPA depolymerization proceeded under mild thermal conditions, and quantitative recovery of the monomer was possible. Direct repolymerization of the …
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Vat Photopolymerization of High-Performance Materials through Investigation of Crosslinked Network Design and Light Scattering Modeling
… photopolymerization (VP) materials required for engineering applications. This has limited the adoption of VP for producing end-use parts, which typically require high MW polymers and/or more stable chemical functionality. Decoupling the viscosity and molecular weight relationship for VP resins …
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