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 29 for “"Aromatic amine"”.
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Substituent effects on intramolecular nucleophilic attack in aromatic amine oxides
Electronic Thesis or Dissertation
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Estimation of human exposure to the carcinogenic aromatic amine 4-aminobiphenyl via hemoglobin dosimetry
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Applied Biological Sciences, 1987.
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Synthesis and characterization of m-aminophenoxide functionalized poly(tetramethylene oxide)
… oxide) (PTMO) with m-aminophenoxide to produce aromatic amine telechelic PTMO of controlled molecular weight and narrow molecular weight distribution. TrifHc anhydride was used to initiate a bifunctional cationic living polymerization of tetrahydrofuran (THP). An anhydrous solution of …
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Fundamentals of Excess Electron Transport in Biologically Relevant Systems
… model system based on electron transfer from an aromatic amine to bromouridine. Electrons injected into duplex DNA by the aromatic amine migrate through the stacked nucleotides to the bromouridine acceptor covalently attached to the DNA. Modifications of the intervening nucleotide sequence …
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Kinetic Studies of 6-Halopurine Nucleoside in SNAr Reactions; 6-(Azolyl, Alkylthio and Fluoro)-purine Nucleosides as Substrates for Suzuki Reactions
… nucleosides with oxygen, sulfur and aliphatic amine nucleophiles, and also with an aromatic amine plus TFA as a catalyst. However, the 6-iodopurine nucleoside is the best substrate for the aromatic amine without acid. With oxygen and sulfur nucleophiles, the 6-sulfonylpurine nucleoside reacted …
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Modification, curing and flame retardation of epoxy resin networks
… and fracture behavior was also studied. Arylamine functionalized poly(arylene ether sulfone)s of controlled molecular weight were synthesized as soluble, but reactive thermoplastic modifiers for aromatic amine cured epoxy resins. These materials were characterized via spectroscopy, …
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THE RELEASE OF CONTAMINANTS BY LEACHING FROM BOIL-IN BAG LAMINATES
… the contribution of potentially toxic aromatic amines to the global migration result was determined. Apparent aromatic amine levels in aqueous simulants, determined using a colourimetric assay, were found to be within the range 0.70 ± 0.07 pg dm-2 and 0.97 ± 0.09 pg dm’2 for laminates …
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Design and synthesis of potential inhibitors of enzymes involved in the biosynthesis and utilisation of mycothiol
… mycothiol-like scaffold, phenyl-1-thio-Dglucosamine, was envisaged to facilitate delivery of this class of redox active molecules to the active-site of the mycothiol enzymes. Successful completion of the synthesis of naphthoquinone conjugates of this scaffold was not achieved due to a …
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Siloxane modified polyurea and polyurethane urea segmented copolymers
… were synthesized using perfectly difunctional aromatic amine terminated polypropylene oxide (PPO) (2800 <Mn>) prepared via aluminum porphorin initiated coordination polymerization. The resulting segmented copolymer showed much higher tensile strength and better thermal stability than polyureas …
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Towards Water-Soluble Peroxyl Radial Clocks
… radicals and reductants (e.g. phenolic and aromatic amine antioxidants) without the need for specialized equipment. Furthermore, this approach allows for the determination of this kinetic data in a wide variety of solvents. Herein, we present our work towards the development of a …
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Synthesis and characterization of perfectly alternating segmented copolymers comprised of poly(dimethylsiloxane)s and engineering thermoplastics
… junction points were synthesized via terminal amine-anhydride coupling from poly(dimethylsiloxane)s and either poly(arylene ether)s or polyimides. The copolymers were characterized in solution and the solid state. The -(-A-B-)-n architecture and molecular design of these linear systems afforded …
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Chemical Surface Modification of Polycarbonate to Increase Hydrophilicity
… its chemical compatibility. Compounds with aromatic rings, like aniline, altered the appearance of polycarbonate. Amines qualitatively reduced the contact angle when compared to untreated polycarbonate. p-Phenylenediamine (PPD) is an aromatic amine commonly used in hair dyes. Polycarbonate …
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Degradation and stabilisation of diisocyanate cured polybutadiene
… on its ability to scavenge radicals. Generally, aromatic amines are the most effective binder antioxidants. But when a peroxide decomposer is combined with an aromatic amine at the appropriate ratio, a synergistic effect is obtained, which gives the lowest binder gel increase rate.
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Synthesis and characterization of poly(propylene oxide) and its copolymers
… both primary and secondary hydroxyl and amine could be incorporated in the polymer chains through the modification of the original catalyst with chain transfer agents such as bisphenol A or p-nitro phenol. These reagents also permitted very significant reductions in the required …
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Characterization of Cure Kinetics and Physical Properties of a High Performance, Glass Fiber-Reinforced Epoxy Prepreg and a Novel Fluorine-Modified, Amine-Cured Commercial Epoxy.
… methane (TGDDM), the tetrafunctional amine curing agent 4,4'-diaminodiphenylsulfone (DDS) and an ionic initiator/accelerator, are determined by various thermal analysis techniques and the results compared. The reaction is monitored by heat generated determined by differential scanning …
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Photocrosslinkable polyimide and poly(imide siloxane) homo- and copolymers: synthesis and characterization
… acid) prepolymers by the reaction of various aromatic dianhydrides with aromatic diamines. The siloxane modified copolymers were synthesized by reacting single or mixed components of the aromatic dianhydrides with a mixture of aromatic amine and bis(3-aminopropyl) end blocked polydimethyl …
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Synthesis and characterization of novel macromolecules/networks via side chain modifications of amorphous poly(arylene ethers)
… of amorphous poly(arylene ethers) with pendant amines were investigated. A new monomer, 3-aminophenyl-bis(4-fluoro phenyl)phosphine oxide was prepared by nitration and reduction of bis(4-fluoro phenyl)phenylphosphine oxide. Statistical incorporation of pendant aryl amines into linear polymers …
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Plant Activation of Bicyclic Aromatic Amines, Benzidine and 4-Aminobiphenyl
Bicyclic aromatic amines, benzidine and 4-aminobiphenyl (4-ABP) have been known as human bladder carcinogens and used in industrial manufacturing. Using the plant cell/microbe coincubation assay, this study showed that benzidine and 4-ABP were activated by plant peroxidase into frameshift- and base …
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Mechanisms of antifatigue agents used in natural rubber
… quinonoid or hindered phenol functions were examined for their roles as antifatigue agents. Among the evaluated quinones and phenols expected to have macroalkyl radical scavenging ability, BQ, αTOC, γTOC and GM showed relatively good performance for fatigue resistance (although their …
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