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 15 of 15 for “"Diacetylene"”.
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Segmented polyurethanes containing diacetylene units in multiple molecular environments
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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The synthesis, characterization and optical properties of novel diacetylene-containing aromatic liquid crystalline polymers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1993.
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The effects of thermal history and degree of cross-polymerization on the thermochromic behavior of diacetylene-containing polyesters
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Two-dimensional polymer synthesis : towards a two-dimensional replicating system for nanostructures
… a 2-D replicating system is pursued which uses a diacetylene moiety for cross-linking and amide hydrogen bonding for molecular recognition between replicates and templates. The synthesis of several monomers for amide hydrogen-bonded adlayer formation is described. The assembly and crosslinking of …
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Photodissociation Dynamics In Titan's Atmosphere
… relevant to understanding Titan's atmosphere (diacetylene, cyanoacetylene and heptane isomers) are carried out under collisionless condition using the DC slice imaging technique. In diacetylene photodissociation, two-photon processes dominate at 243 nm and 212 nm whereas at 121.6 nm, a …
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USING CONJUGATED POLYMERS AS BIOLOGICAL SENSOR BASED ON FLUORESCENCE RESONANCE ENERGY TRANSFER
… (FRET) between fluorophore (donor) and polydiacetylene (PDA, acceptor) for selective detection of biomolecules in solution. The work described in this dissertation is divided into three sections. In the first section, we report here two novel systems where the rate of energy transfer is …
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Development of stimulus-responsive polydiacetylene systems for molecular colorimetric detection
… this goal, I have rationally designed polydiacetylene systems that possess unique optical properties such as color changing in the presence of external stimulus. These advanced polydiacetylene systems are conjugated with functional groups having specific targeting ability toward targeted …
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Inkjet printing multifunctional chromatic sensors and chromism study
The thermochromism and chemochromism of polydiacetylene (PDAs) and PDA/ZnO nano composites have been systematically studied by attentuated total reflection (ATR)- Fourier transform infrared (FTIR), temperature-dependent Raman, colorimetric (using optical densitometry) and differential scanning …
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Functional Materials From Self-Assembled Macrocycles
… polymers are typically amorphous, we designed a diacetylene containing tetra-amide macrocycle that self-assembles into columns through amide hydrogen bonding. External energy sources (heat or UV irradiation) initiate the polymerization along the column readily to give conjugated macrocyclic …
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Leveraging the Photochemistry of N-Nitrosamines for Their Aqueous Detection, and Development of a Novel Hemi-Iptycene for Porous Polymers
… 4, the synthesis of a novel hemi-iptycene diacetylene monomer, whose core structure is derived from triptycene and diphenylfulvene, is described. The hemi-iptycene quinone precursor to the diacetylene monomer is constructed by the one-pot Diels–Alder cycloaddition–dehydrochlorination of …
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Astrochemical dynamics: Fundamental studies relevant to titan's atmosphere
… and aerosols in Titan's upper atmosphere. In the diacetylene dimer, it is shown, via laboratory studies combined with electronic structure calculations that the photodissociation of the dimer readily initiates atomic hydrogen (H) loss and atomic H transfer reactions forming two prototypes of …
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Making Nuclear Magnetic Hyperpolarization Practical through Storage in Disconnected Eigenstates
… ranging from simple four-spin systems, such as diacetylene (TS = 48.80 ±22.74 s, T1 = 18.66 ±1.16 s) to eight spin systems in dimethylmaleic anhydride (TS = 27.25 ±3.39 s, T1 = 9.38 ±0.43 s). Additionally, a family of compounds including naphthalene (TS = 4.37 ±0.34 s, T1 = 11.33 ±4.89 s), …
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Nanophase Separation and Photochemical Reaction of Rodcoil Molecules, Reactive Liquid Crystal Molecules, and Binary Mixtures
… sensitized groups such as anthracene and diacetylene segments. Irradiation of these materials at various temperatures led to the formation of distinct dimesogens and other high molecular weight material which allowed one of the reactive liquid crystals to act as a negative photoresist for …
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Understanding and engineering azobenzene for thermal energy storage
… of the molecular thin film. In chapter 4, new diacetylene derivatives with azobenzene moieties and with varied alkyl spacers and linkers were synthesized to show photocontrolled self-assembly and disassembly of photon energy storage materials. This azobenzene decorated diacetylenes not only …
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Triphenylene as a Scaffold for New Molecular Materials
… coupled with di-hexyloxysubstituted diacetylenetriphenylene. The diacetylene triphenylene was synthesised successfully following on from the work achieved in the first project. Two routes were explored for the synthesis of the diazide. The first, a direct conversion of the dibromide …