This work expands the current understanding of materials chemistry and engineering capabilities of two synthetic platforms: 1.) bis-ortho-diynylarenes (BODA) and 2.) trifluorovinylaryl ethers (TFVE). Each platform possesses a unique chemistry which paradoxically enables the development of high-performance materials therefrom while simultaneously retaining exceptional melt and solution processability. Leveraging the apparent dichotomy in properties (performance/processability) obtainable from these two synthetics platforms, we have pursued and achieved a practical approach to high-temperature resistant materials with an immense potential for technology transfer and commercialization:
1.) BODA-derived resins (BDR) constitute a versatile platform of melt-processable resins capable of rapidly producing high performance matrix composites which include thermoset, carbon-carbon, and other specialty carbon or hybrid ceramic composite structure. BODA monomers can be synthesized via a three-step process from commercially available bisphenols and undergo a facile catalyst-free, thermal-initiated polymerization to yield polyarylene thermosets with outstanding thermal-oxidative stability, low heat release, flame resistance, and high carbon yields (>80%). The combination of melt processability, ease of cure, and high carbon yields in BDR provides an attractive quick, single-step fabrication of carbon/carbon (C/C) composites with excellent interlaminar shear strength (ILSS; ~1800 psi) after a single infusion/carbonization. Furthermore, our work in this area has shown that C/C from BDR can be prepared via a fast carbonization (10 °C/min), relative to typical 1 °C/min or 1 °C/hr industrial carbonizations, without causing undesirable shrinkage, cracking, interlaminar debonding, or detrimental changes in ILSS.
2.) Large polyaromatic hydrocarbons (PAHs) are typically known for their interesting thermal- and photo-optical properties but suffer from poor solubility and processability issues. Functionalization of these moieties with TFVE fluorocarbon groups enables melt or solution polymerization via a thermally initiated [2+2] cyclodimerization of the TFVEs towards high performance perfluorocyclobutyl (PFCB) aryl ether polymers. For example, successful fabrication of free-standing photoluminescent films with record high glass transition temperatures (Tg ~ 300 °C), exceptional thermal-oxidative stability (~250 °C, 24 h), unprecendented photostability at 250 °C in air, and excellent solubility in common organic solvents (at room temperature) have been realized via a set of triphenylene-enchained PFCB aryl ether polymers.
| Identifer | oai:union.ndltd.org:MSSTATE/oai:scholarsjunction.msstate.edu:td-7071 |
| Date | 08 August 2023 |
| Creators | Borrego, Ernesto Isaac |
| Publisher | Scholars Junction |
| Source Sets | Mississippi State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Theses and Dissertations |
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