Structure-Property Relationships in Polycyanurate / Graphene Networks
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 12, 2015
- Accession Number
- AD1004645
Entities
People
- Andrew J. Guenthner
- David D. Swanson
- Gregory R. Yandek
- Joseph M Mabry
- Josiah T. Reams
- Kevin R. Lamison
Organizations
- Air Force Research Laboratory