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Showing 1 to 10 of 10 for “"polyarylene"”.
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Synthesis and characteristics of polyarylene ether sulfones
The classical route for the synthesis of this family of macromolecules is via nucleophilic aromatic substitution using dimethylsulfoxide (DMSO) as a dipolar aprotic solvent and aqueous sodium hydroxide as a base. High molecular weight homopolymers can be synthesized in a short time (1 hour). …
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Synthese und Charakterisierung von Copolyarylenen : neue Polyelektrolyte für Brennstoffzellen
… Für diese Anwendung wurden neue Polyarylene ohne aliphatische Seitengruppen realisiert. Sämtliche synthetisierten Polymere waren löslich in N,N-Dimethylformamid (DMF) oder Chloroform, was eine homogene Funktionalisierung mit Sulfon- oder Carbonsäuregruppen ermöglichte. Die …
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Toughening of cyanate ester networks with reactive thermoplastic modifiers
… control. The use of Bisphenol-A based amorphous polyarylene ether ketones (which are of lower polarity relative to the Bisphenol-A based polyarylene ether sulfones) resulted in larger, well defined morphologies which in turn resulted in tougher networks. It was demonstrated that either hydroxyl …
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The design and synthesis of linear and macrocyclic Poly(para-arylene)s
… backbone. Recent interest in belt-shaped p-polyarylene macrocycles, otherwise known as nanohoops, has been high due to their potential as a starting template for the bottom-up synthesis of armchair carbon nanotubes (CNTs). The proposed strategy involves iterative Diels-Alder cycloadditions …
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The design and synthesis of organic chromophores for Faraday rotation and photoluminescence
… and evaluate the properties of a new class of polyarylene chalcogenides. We utilized dynamic covalent SNAr behavior to demonstrate selective depolymerization. In addition, we studied the mechanism of the bright photoemission, ascribing it to delayed fluorescence enabled by the presence of …
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The preparation and characterization of PEK/TEOS glasses by the sol-gel method
… glasses. The PEK represents the bisphenol-A polyarylene ether either ketone thermoplastic polymer endcapped with triethoxysilane functional groups. By mixing the PEK and TEOS components at different weight compositions in the starting sol-gel reaction solution, change in the mechanical …
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Direct Polymerization Of Sulfonated Poly(arylene ether) Random Copolymers And Poly(imide)Sulfonated Poly(arylene ether) Segmented Copolymers: New Candidates For Proton Exchange Membrane Fuel Cell Material Systems
… hydrophobic polyimide-hydrophilic sulfonated polyarylene ether copolymers. Both ester-acid and amic acid synthesis routes were utilized in combination with spin-casting and bulk imidization. A series of tough, film-forming segmented copolymers was prepared and characterized. AFM measurements …
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Structure-property behavior of novel high performance thermoplastic and thermoset structural adhesives and composite matrix resins
… achievable at optimum crosslink density. Polyarylene ether sulfones were also studied which demonstrated the desirable combination of excellent thermal stability and good mechanical properties. Biphenyl-based polysulfones were synthesized and endcapped with 3-phenyl ethyny] functional …
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Polydimethylsiloxane Containing Block Copolymers: Synthesis and Characterization of Alternating Poly(Arylene Ether Phosphine Oxide)-B-Siloxane and Segmented Nylon 6,6 -B-Siloxane Copolymers
… polydimethylsiloxane and the hydrocarbon based polyarylene ethers and nylon 6,6.