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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 20 for “"poly(dimethyl siloxane)"”.
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A Self -Healing Poly(dimethyl Siloxane) Elastomer
The self-healing performance of the elastomer is also investigated under torsional fatigue loading. The microcapsule-based self-healing PDMS is capable of recovering a significant portion of the original torsional stiffness and retards dynamic crack growth rate. Depending on the matrix material, a …
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Electromechanical Characterization of Poly(Dimethyl Siloxane) Based Electroactive Polymers
… cross-linking polar cyano phenyl (CN) groups on poly (dimethyl siloxane) (PDMS) and 2) to characterize the electromechanical properties of the resulting CN-PDMS blend as an electroactive actuator. Materials responding to an external stimulus are referred to as electroactive materials. There are …
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The Development of Microfluidic Devices Fabricated From Poly(dimethyl) Siloxane
"This dissertation outlines work in the field of polymeric microfluidic (muFL) devices, particularly the design and fabrication of microfluidic devices using poly(dimethyl) siloxane (PDMS). Fabrication involved lithographic and ""soft"" lithographic techniques. Capillary electrophoretic separation …
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High oxygen permeation rates through poly(dimethyl siloxane) for fuel cells and oxygen reduction reaction mechanistic studies
… the largest efficiency losses in conventional polymer electrolyte membrane (PEM) fuel cells. Mass transport is limited by the inherent low solubility of oxygen in water. This low solubility and diffusivity can be overcome through reduction of electrolyte thickness, and by utilizing a thin cell …
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Synthesis and characterization of high performance polyimide homopolymers and copolymers
Polyimides are generally formed by combining a dianhydride and a diamine monomer in a polar aprotic solvent to form a poly(amic acid). The poly(amic acid) is then cyclodehydrated by either thermal or solution imidization at high temperatures to give the fully cyclized polyimides. This research …
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Supramolecular NanoStamping (SuNS) : fabricating nano/bio devices using DNA as a movable type
… multiple substrates, hard (gold, silicon), soft (Poly-methyl-methacylate or Poly-dimethyl-siloxane) or even liquid. The technical specifications of the printing process depend on the substrate material.
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Composite cathodes for lithium rechargeable batteries
… within preferred domains of self-organizing copolymers was investigated towards the fabrication of composite, nanoarchitectured electrode materials for solid-state rechargeable batteries. In situ growth of cathodic phases within ion-conducting copolymer domains was explored as a means to …
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Self-sealing of thermal fatigue and mechanical damage in fiber-reinforced composite materials
… chemistry comprised of silanol terminated poly(dimethyl siloxane) plus a crosslinking agent and a tin catalyst was employed to allow higher composite processing temperatures. The microcapsules were incorporated into a satin weave E-glass fiber/epoxy composite processed at 120C to yield a …
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Siloxane-Based Reinforcement of Polysiloxanes: from Supramolecular Interactions to Nanoparticles
Polysiloxanes represent a unique class of synthetic polymers, employing a completely inorganic backbone structure comprised of repeating –(Si–O)n– 'siloxane' main chain linkages. This results in an assortment of diverse properties exclusive to the siloxane bond that clearly distinguish them from …
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Stress and microstructure development in particle-based coatings
… of drying uniformity. Silicon cantilevers with poly(dimethyl siloxane) (PDMS) walls along the perimeter were used to suppress the effects of lateral drying during stress measurement. The walled cantilevers were used to characterize stress development in ceramic particle coatings and latex films. …
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Mixed Gas Transport Study Through Polymeric Membranes: A Novel Technique
The gas transport and separation properties of polymers have been successfully exploited in commercial ventures. Industrial applications employing membrane processes range from production of pure gases to barrier coatings for protection against environmental elements. Membrane separations are …
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Improving hydrophilicity of silicone elastomer by IPN formation with hyaluronan
… this research was to create an interpenetrating polymer network (IPN) materials of poly(dimethyl siloxane) (PDMS) and hyaluronan (HA) with such properties. The results in this work indicate the successful synthesis of these HA-PDMS IPN materials. These elastomeric materials had improved …
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Structure-property relationships of electron beam irradiated monomeric and polymeric systems
… for electron beam(EB) irradiated monomeric and polymeric systems. The objectives were to study the feasibility of preparing systems of potential application, and to characterize these systems in terms of structure-property behavior. In this thesis, the basic theories on radiation chemistry were …
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Toward commercializable microphase-separating copolymer electrolytes for rechargeable lithium batteries
Microphase-separating copolymers have been shown to possess the electrical properties of a polymer liquid and the mechanical properties of a solid. In the past, these materials had to be produced via anionic methods that are not easily scalable. To circumvent this problem, two approaches were …
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Synthesis and characterization of ammonium ionenes containing hydrogen bonding functionalities
Ammonium ionenes are polycations that have quaternary nitrogens in their macromolecular backbone and are synthesized via step-growth polymerization technique. They offer interesting coulombic properties, and the synthetic design provides control over charge density. Non-covalent interactions …
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Shock initiation of explosives under the microscope
… ranging from low-density powder compacts to polymer-bound explosives which has no void space on the microscale. The temperature histories have given us valuable insight into the dynamics and reaction kinetics of explosive materials under shock compression by thin flyers. Short duration shocks …
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Studies of adsorption and stabilization of silica suspensions using well-defined polymeric dispersants
Solutions of poly(2-ethyl-2-oxazoline) and poly(2-methyl-2-oxazoline) in water and several alcohols were characterized by light scattering and cloud point measurements. The second virial coefficients in water were found to decrease with increasing temperature, reflecting lower critical solution …
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Self-healing of high temperature cured epoxy and composites
The use of structural fiber-reinforced polymeric composites and epoxy adhesives in aircraft, ships, vehicles, and wind turbine blades has increased markedly in the past decades. However, the polymeric matrix in these composites and adhesives typically consists of a brittle thermoset, which results …
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Tailoring Siloxane Functionality for Lithography-based 3D Printing
Polymer synthesis and functionalization enabled the tailoring of polymer functionality for additive manufacturing (AM), elastomer, and biological applications. Inspiration from academic and patent literature prompted an emphasis on polymer functionality and its implications on diverse applications. …
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Funktionalisierung von Silikonoberflächen
Poly(dimethylsiloxan) (PDMS) ist ein wichtiges Polymer, das zunehmend in der Mikroelektronik aufgrund seiner hervorragenden Elastizität und thermischen Stabilität Verwendung findet. Ein limitierender Faktor für den Einsatz von PDMS ist aufgrund des Fehlens von reaktiven Gruppen und der niedrigen …