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 47 for “"Organic polymers"”.
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Thermoelectric Properties of Organic Polymers
… potential in flexible electronic applications, organic thermoelectrics have attracted considerable attention. Nonetheless, further enhancing their thermoelectric performance remains a great challenge. Solutions have been proposed, encompassing molecular structure design, uniaxial alignment, and …
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Carbazole-based porous organic polymers for photocatalytic hydrogen evolution
… in chemicals. Within the last decade, porous organic polymers (POPs) proved to be promising candidates to be applied as photocatalyst. Due to the variety of building blocks, the optical properties can be tuned towards the employment of visible light, which is mandatory achieving industrial …
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Estimating mobility values from electroluminescence measurements on organic polymers
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Blister Test for Measurements of Adhesion and Adhesion Degradation of Organic Polymers on AA2024-T3
… to measure adhesion and adhesion degradation of organic polymers to AA2024-T3 were tested. The pull-off test does not produce adhesive failure across the entire interface, while the tape test is a very qualitative technique and does not discern between the effects of different coating systems on …
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Microelectrochemical transistors based on conjugated organic polymers : chemistry, electrochemistry, and the electronics of molecule-based devices
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Structure- and Composition-Performance Relationships of Electrically Conductive Metal-Organic Frameworks, Conjugated Porous Organic Polymers, and Fused Aromatics
… modulability, electrically conductive metal-organic frameworks (MOFs), have drawn increasing attention due to their potential use in a variety of applications including electrochemical energy storage (EES). Although fully conjugated porous organic polymers (POPs) generally exhibit lower …
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Nonlinear Optically Active Ionically Self-Assembled Monolayer Thin Films of Organic Polymers Intercalated with an Inorganic Hectorite, Laponite RD
… and interchain repulsion is reduced and so the polymers adsorb to form thicker layers with more loops and tails than for the case at lower pH. This also results in a higher density of the chromophore in the film. Extremely smooth surfaces of Laponite RD in film were obtained as confirmed by AFM …
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The synthesis and chemistry of new carbosilane dendrimers and their use in polymerisation catalysis
… of attention. The immobilisation of catalysts on organic polymers and on inorganic materisl such as silica is a well known strategy. Recently, dendrimers have also been used as support materials. In this thesis, an investigation towards the immobilisation of homogeneous polymerisation catalysts on …
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Seebeck coefficient in organic semiconductors
… to quantify the role of energetic disorder in organic semiconductors. To this end, a microfabricated chip was designed to perform accurate measurements of the Seebeck coefficient within the channel of the active layer in a field-effect transistor (FET). When measured within an FET, the Seebeck …
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Multinuclear NMR Investigations of Sol-Gel Systems
The inorganic polymeric materials known as oxide glasses are normally prepared by the fusion of refractory oxides, followed by rapid cooling to avoid devitrification. A topic of current interest in materials research is the preparation of oxide glasses by the hydrolysis and polymerization of metal …
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Synthesis and Characterization of Highly Porous Borazine-Linked Polymers via Dehydrogenation/Dehydrocoupling of Borane-Amine Adducts and Their Applications to Gas Storage
A new class of porous polymers has been designed and successfully synthesized by thermal dehydrogenation of several polytopic arylamine-borane adducts and has been designated Borazine-Linked Polymers (BLPs). The polymers reported are constructed of linear, triangular, and tetrahedral amine building …
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Designed Synthesis of Halogenated Borazine-Linked Polymers and Their Applications in Gas Storage and Separation
The synthesis of highly porous organic polymers with predefined porosity has attracted considerable attention due to their potential in a wide range of applications. Of particular interest in porous organic polymers is their potential use in automotive applications as well as separation processes …
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Field Induced Polymer Electroluminescence
… a new approach to electroluminescence in organics using a device employing alternating current (AC) field-induced polymer electroluminescence (FIPEL). This device consists of a transparent conductor, polymer dielectric layers, charge generation layers, a conjugated polymer-based emissive …
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Impact of Post-Synthesis Modification of Nanoporous Organic Frameworks on Selective Carbon Dioxide Capture
Porous organic polymers containing nitrogen-rich building units are among the most promising materials for selective CO2 capture and separation applications that impact the environment and the quality of methane and hydrogen fuels. The work described herein describes post-synthesis modification of …
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Single stranded DNA: A new model system for single molecule polymer dynamics
… to flexible polymer chains, such as synthetic organic polymers. In this work, we developed a new model system for single molecule studies of flexible polymers based on single stranded DNA (ssDNA). Using a biochemical synthesis scheme called rolling circle replication, long strands (>25 µm) of …
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Laboratory studies using sodium-bearing waste simulant - ADL 26-94
… removal rates and resistance to filtration. The organic polymers were gauged by their ability to properly condition the sludge by use of capillary suction time (CST) apparatus and wedge zone simulator (WZS). Low impeller mixing speeds cause less excess floc deterioration and lower resistance to …
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Porosity control of alkali-activated aluminosilicates via functional alkoxysilane additives
Geopolymers were synthesized with alkoxysilane and other organo-silane supplements to improve adhesion to organic polymers and to modify porosity. Uncured geopolymer slurry was found to be miscible with various alkoxysilanes, and the resulting cured geopolymer strongly adhered to organic polymers …
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Acetylene Functionalized Photocatalytic COFs for PFAS Adsorption and Degradation
Covalent organic frameworks (COFs) are of deep interest in various applications due to their highly tunable architectures and porosities. COFs used as photocatalysts have great potential because they usually possess high surface areas for adsorption, tunable pore and surface functionalities, and …
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Synthesis and Applications of Novel Responsive Materials
This thesis describes the synthesis of responsive organic polymers which show potential for use in a variety of applications. A series of pyridine terminated m-phenylene ethynylene oligomers were synthesized. When trans-dichlorobis(acetonitrile)palladium was added to a solution of these oligomers, …
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Studies toward Augmented Carbene/Alkyne Cascade Reactions and Ruthenium Catalysts for Propargylic Substition
… reactions are highly effective processes in organic chemistry, and they can provide complex molecules in a single synthetic method. Our approach is based on a rhodium-catalyzed diazo-decomposition of readily available starting materials. Then the reaction goes through metal-carbene and alkyne …
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