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 16 of 16 for “"Tetrafluoroethylene"”.
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Batch separation of tetrafluoroethylene, hexafluoropropylene and octafluorocyclobutane
… a small batch distillation column to purify tetrafluoroethylene and hexafluoropropylene from a mixture containing tetrafluoroethylene, hexafluoropropylene and octafluorocyclobutane. As no vapour-liquid equilibrium data are available for these chemicals in this mixture, new vapour-liquid …
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Chemical vapor deposition of fluorocarbon films for low dielectric constant thin film applications
… of high molecular weight chains of poly(tetrafluoroethylene). Poly(tetrafluoroethylene) film porosity was introduced and controlled through the competition between nucleation and growth of film. Porous poly(tetrafluoroethylene) films were further integrated into a bridge layer and air gap …
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Structure-Property Relationships of Flexible Polyurethane Foams
… were examined in cast blends based on poly(tetrafluoroethylene) (PTFE) and the terpolymer poly(tetrafluoroethylene-co-vinylidene fluoride-co-hexafluoropropylene) (FKM). This revealed that tensile and dynamic moduli could be predictably altered by controlling the degree of FKM cross-linking …
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Understanding the role of kinetic parameters on the crystallization of miscible semicrystalline polymer blends
… fluoride <i>co</i>- tetrafluoroethylene)(95-5) (PPVL/P(VF2-TFE)(95-5)) prepared by solution blending. The spherulitic growth rates of the α-phase PPVL from miscible blends with PVF₂ or P(VF₂- TFE)(95-5) were measured by polarized optical microscopy as a function of …
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Instrumentation, Applications And Fundamentals Of Plasma Ionization Of Organic Molecules From Surfaces
… fluorinated polymer was broken down into tetrafluoroethylene monomers which immediately polymerized to form perfluorinated alkyl chains.</p>
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Single layer graphene as a stable and transparent electrode for the measurement of non-aqueous electrogenerated chemiluminescence and charge transfer inverse photoemission
… and ECL. SLG electrodes patterned with poly-tetrafluoroethylene permitted the stable generation of radical ions on an SLG microelectrode to be studied through Scanning Electrochemical Microscopy (SECM) in the generation/collection mode. The transparency of graphene was used to obtain accurate …
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The Reactions of Oxygen Atoms and Monofluoromethylene Radicals with Fluorinated Ethylenes in the Gas Phase
… cis- and trans- 1,2-difluoroethylene, tetrafluoroethylene and pentafluorocyclopropane. Some CF2 elimination from “hot" cyclopropane occurred even at atmospheric pressure. The, _pentafluorocyclopropanes were formed by addition of CF, to the trifluoroethylene. Principal features of the …
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Nitrogen oxide delivery systems for biological media
… from a gas stream through a porous poly(tetrafluoroethylene) membrane. Oxygen, consumed by reaction with NO or by other processes, is supplied by diffusion from a separate gas stream through a loop of poly(dimethylsiloxane) tubing. The adventitious chemistry observed in a prior device for …
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Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… as a candidate for compatibilization of poly(tetrafluoroethylene)-PEEK polymer blends. Superacid-modified PEEK was synthesized through a similar methodology and demonstrated over 50,000% increased hygroscopicity relative to the parent homopolymer, and exhibited preserved crystallizability. …
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Fluorocarbene, Fluoroalkyl, and Fluoride Complexes of First-Row Transition Metals
… CF3) undergo [2+2] cycloaddition reactions with tetrafluoroethylene (TFE) and phenylacetylene to form perfluorometallacyclobutane and partially fluorinated metallacyclobutene products, respectively. For both reactions, computational studies reveal a stepwise ring-closing mechanism, which proceeds …
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Exotic Monoliths
… the polymerisation of styrenic monomers in poly(tetrafluoroethylene) coated capillaries using blue light emitting diode arrays. In both cases the characterisation and application of the synthesised monoliths is presented showing that they are suited to use in separation science. The suitability …
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Thermoplastic-based pyrotechnic compositions
… wt.% and 70 wt.% reducing agent. Co-polymers of tetrafluoroethylene and vinylidene fluoride filled with aluminium or magnesium showed similar adiabatic temperatures as compositions based on perfluorinated polymers with the same reducing agents. The energy required to decompose the thermoplastic …
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CONFINED LAYERED POLYMERIC SYSTEMS FOR PACKAGING ANDCAPACITOR APPLICATIONS
… (PET) and poly(vinylidene fluoride-co-tetrafluoroethylene) [P(VDFTFE)] were investigated under nanolayer confinement. In addition, both biaxial stretching and isothermal melt recrystallization were used as an additional approach to manipulate the morphologies of these confined polymers. …
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Separation of various organic-organic and aqueous-organic solutions via pervaporation
… made of a copolymer of polydimethyldioxole and tetrafluoroethylene known as PDD-TFE of the CMS-3 variety with a very high free volume. This novel membrane is used to separate a variety of organic-organic and aqueous-organic mixtures. An earlier study based on water-ethanol-isopropanol has shown …
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Investigating Cathode–Electrolyte Interfacial Degradation Mechanism to Enhance the Performance of Rechargeable Aqueous Batteries
… material performance through coating sulfonated tetrafluoroethylene (i.e., Nafion) on the particle, which can regulate the proton diffusion and Mn dissolution behavior. Our study discovers the dynamic Mn D/R process and highlights the impact of coating strategy in the performance of aqueous …