Title: Processable Enediyne Resins and the High Yielding Glassy Carbons Derived Therefrom
Authors: Ernesto I. Borrego, Behzad Farajidizaji, Hossein Toghiani, Charles U. Pittman, Jr., Dennis W. Smith Jr.
Abstract: High temperature polynaphthalene networks derived via the step-growth thermal cyclopolymerization of bis-o-diynylarene (BODA) monomers have previously been shown to produce unprecedented high yielding glassy carbons upon pyrolysis at 1000°C. In our current studies to expand the processability parameters of the BODA approach for carbon-fiber matrix composite and carbon-carbon composite applications, we have introduced mono-o-diynylarene (MODA) co-monomers to control reactivity, branching, and ultimate crosslink density for specific pre- and post-carbonization applications. As a special class of enediynes, the MODA monomers were prepared in a single step from the Sonogashira coupling of terminal alkynes with diiodobenzene to yield enediynes of varying terminal substitution. Their cyclopolymerization with BODA are shown here to yield polymers with controlled molecular weight, viscosity, and latent enediyne reactivity. This work seeks to establish BODA-MODA copolymers which are amenable to current composite processing limits, improve mechanical properties, and which retain high temperature properties including extremely high (>75 %) carbon yields.
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Conference: SAMPE NEXUS 2021
Publication Date: 2021/06/29
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