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Structure-Property Relationships in Polycyanurate / Graphene Networks

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Technical Report,17 Nov 2015,12 Dec 2015

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AFRL/RQRP Edwards AFB United States

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Outline Background Motivation, Sequentially Prepared Graphene Types, Polycyanurate GO Composite Preparation, Composite Morphology, Composite Mechanical and Physical Property Characterization. Summary Different forms of graphene in polycyanurate networks showed markedly different dispersion behavior. Graphene oxide dispersed well, but retained the form of stacked aggregates. Thermally-reduced graphene oxide formed mechanically interlocked shredded stacks. Edge-functionalized graphene showed little or no dispersion. Dispersion processes for graphene oxide generally did not affect aggregate morphology. Instead, the chemical processes employed were primarily responsible for the differences in composite morphology. Trends in mechanical property data generally followed expectations for non-bonded aggregates, with increased stiffness and toughness correlated to the quality of dispersion. Incorporation of graphene in all forms led to decreases in the onset temperature of thermochemical degradation and char yields. Incorporation of graphene oxide and thermally-reduced graphene oxide led to increased water uptake, and no measureable change in diffusion rates. The hydrophilic nature of graphene oxide aggregates, and the interconnected nature of thermally-reduced graphene oxide aggregates, prevent the expected reduction in permeation.

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