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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 9 of 9 for “"Disiloxane"”.
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Synthesis, kinetics and supercritical fluid fractionation studies of functional organosiloxanes and their incorporation into segmented copolymers
… presence of 1,3-bis(3-aminopropyl) tetramethyldisiloxane. Catalysts studied included the commonly used potassium siloxanolate catalyst, as well as the analogous tetramethylammonium and tetrabutylphosphonium siloxanolate catalysts. The reactions of the quaternary ammonium and phosphonium systems …
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Palladium catalyzed cross-coupling reactions of allyl- and vinylsilanes
… was discovered to dimerize to a non-competent disiloxane species at elevated temperatures. Hemilabile phosphine ligands and basic additives can be employed to facilitate the cross-coupling with aryl bromides; however, further studies are needed to prevent dimerization of the silanolate from …
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The Creation of Algorithms Designed for Analyzing Periodic Surfaces of Crystals and Mineralogically Important Sites in Molecular Models of Crystals: Understanding the Electron Density Function Through Visual Examinations of the Curvature and Shape of the Equi-Value Laplacian Surfaces
… are capable of reproducing known features. The disiloxane molecule, H6Si2O7, was studied because it serves as a model for bonding in quartz and other important silicates. Lastly, the molecule NaLi2Si2OF9 was examined as a molecular model for low albite. A new discovery suggests that these …
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Synthesis and characterization of perfectly alternating segmented copolymers comprised of poly(dimethylsiloxane)s and engineering thermoplastics
… of a "monofunctional" bis-norbornane anhydride disiloxane endcapping species. Aromatic amine-terminated engineering thermoplastics were synthesized through either nucleophilic aromatic substitution in the presence of a “monofunctional” aminophenol endcapper (as for poly(arylene ether ketone)s …
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The ring-opening polymerization of cyclosiloxanes in the presence of bis ([alpha], [omega]-aminopropyl)-1,3-tetramethyldisiloxane
… presence of bis(α,ω-aminopropyl)-1,3-tetramethyldisiloxane using potassium siloxanolate and tetramethylammonium siloxanolate catalysts has been investigated. The use of reversed-phase high performance liquid chromatography (HPLC) and capillary gas chromatography (GC) allowed the disappearance of …
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THE SYNTHESIS OF SILICON-MODIFIED LIPIDS AND THE INVESTIGATION OF THEIR SURFACE PROPERTIES
… hybrid siloxane phosphocholines that possess a disiloxane moiety appended onto a single tail of many biologically relevant double tail phosphocholines are capable of spontaneously forming vesicles of 100 nm in diameter without the need of extrusion or other forceful techniques at these …
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PECVD of silicon and titanium based coatings to enhance the biocompatibility of blood contacting biomedical devices
… silicon based coatings deposited from hexamethyl disiloxane (HMDSO) to analyze the influence of plasma process parameters like RF power, precursor flow ratio and flow rate on the surface chemical and mechanical characteristics of the film. Titanium dioxide coatings deposited from titanium …
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Investigating Lipase Stability in Hydrophobic Solvent at Extreme Temperatures: A Molecular Dynamics Study of Candida Antarctica Lipase B in Polydimethylsiloxane
… the catalyst for the polymerization reaction of disiloxane-containing polyesters. The results demonstrated a remarkable thermal tolerance of CALB, with peak catalytic efficiency achieved at 130°C and a high level of activity maintained at 100°C after ten 24 hour reaction cycles. To investigate …
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Tailoring Siloxane Functionality for Lithography-based 3D Printing
… of PDMS diamines in the presence of a disiloxane diamine chain extender and urea afforded isocyanate-free polyureas in the absence of solvent and catalyst. Dynamic mechanical analysis (DMA) measured multiple, distinct α-relaxations that suggested microphase separation. This work …