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 16 of 16 for “"triptycene"”.
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Triptycene side unit effects on compressive yield strength in polycarbonates
… physical properties of the polymer. The role of triptycene in polycarbonate was studied by adding a low concentration of triptycene-containing polymer chains, and using compression testing. The triptycene polycarbonate was a blend created from two separate products. Differential Scanning …
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Design and synthesis of functional graphenic and triptycene poli(arylether) materials
… as well as the synthesis and properties of a new triptycene poly(arylether), triptycene- PEEK (Trp-PEEK) and its derivatives. In chapters 1-3, the development of new methods to functionalize graphitic materials with both small molecule functional groups and polymers and their implementation as …
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Synthesis and applications of materials and polymers containing graphenic and/or triptycene moities
… those materials are presented. In part II, new triptycene-based polymers are synthesized and their performance is explored. Part I: Graphenic Materials Chapter 1: Three different types of epoxy-functionalized multiwalled carbon nanotubes (EpCNTs) were prepared via multiple covalent …
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Synthesis and Properties of Novel Triptycene-containing Segmented Polyurethanes and Semicrystalline Polysulfone-polyester Multiblock Copolymers
… dissertation, segmented polyurethanes containing triptycene units and multiblock copolymers containing poly(arylene ether sulfone) (PAES) and poly(1,4-cyclohexyldimethylene terephthalate) (PCT) segments were synthesized and systematically studied. Investigation of the influence of the bulky …
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Enhancing materials for fuel cells and organic solar cells through molecular design
… in fuel cells and solar cells. In chapter 1, triptycene poly(aryl ethers) are synthesized and characterized for enhancing ion conductivity of ion exchange membranes in fuel cells. Triptycene motif is incorporated to increase charge density and fractional free volume in the membranes. In …
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Synthesis and Characterization of Amorphous Cycloaliphatic Copolyesters with Novel Structures and Architectures
… degradation among these samples. A new triptycene diol (TD) was synthesized and incorporated into a series of cycloaliphatic copolyester backbones by melt condensation polymerization. Straight chain aliphatic spacers, including ethylene glycol (EG), 1,4-butanediol (BD) and 1,6-hexanediol …
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The design and synthesis of linear and macrocyclic Poly(para-arylene)s
… inaccessible alkoxy substituted poly(phenylene triptycene). We discuss the limitations of this synthetic route for the installation of the three-dimensional triptycene scaffold along the polyphenylene backbone. Recent interest in belt-shaped p-polyarylene macrocycles, otherwise known as …
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Elucidation of the Various Mechanisms of Antioxidant Activity of Organosulfur Compounds
… us to make use of the persistence imparted by a triptycene backbone to study two-electron processes, namely - thiol oxidation by hydrogen peroxide (H2O2). Indeed, the reaction of thiols with H2O2 is central to many processes essential to life, from protein folding to redox signaling. However, …
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Triptycenes as a molecular building block to introduce internal free volume in organic materials
Chapter 1. Triptycenes are shown to possess "internal free volume" swept out between their aromatic faces, which enable them to align their long axis normal to the host alignment to most efficiently fill this volume. This alignment is the opposite of that expected by conventional aspect ratio …
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Modified Poly(arylene ether sulfone) Compositions and their Segmented Block Copolymers
… A (BA), 4,4′-dihydroxyterphenyl (DHTP) and triptycene-1,4-hydroquinone (TPDH), were synthesized using a polyetherification synthetic method. These thermoplastic PAES were copolymerized with the elastomer, polydimethylsiloxane (PDMS) to form segmented block copolymers. The segmented block …
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Development of novel transition metal-catalyzed cross-coupling reactions and applications thereof
… anilines. Chapter 4 The development of a novel triptycene-based hole-transport material is reported. Computational as well as preliminary photophysical and voltammetric data suggests that this class of compounds could serve as an excellent host material for blue triplet emitters.
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Molecular design for controlling morphology in organic electronics
… (BHJ) solar cells based on an extended triptycene-containing unit. The incorporation of these additives on BHJ photovoltaic devices based on PTB7 and PC71BM leads to an increase in power conversion efficiencies of 10-20%. We also found that the additives produce more consistent …
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Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
In Chapter 1, we incorporate functional groups in triptycene-containing poly aryl ethers to serve a variety of applications. Amine-functionalized polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based …
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Leveraging the Photochemistry of N-Nitrosamines for Their Aqueous Detection, and Development of a Novel Hemi-Iptycene for Porous Polymers
… 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 2-chlorotriptycene quinone with diphenylfulvene, which is …
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Palladium-catalyzed C-N cross-coupling and application to the synthesis of delayed singlet emitters for OLED development
… yields. In Chapter 3, a series of novel triptycene-based compounds were synthesized using a palladium-catalyzed C-N, C-C, C-N cross-coupling sequence. Experimental results suggest that this series of compounds could potentially be used as delayed singlet emitters for organic light …