Extreme Thermal Stabilization of Carborane–Cyanate Composites via B–N Dative-Bonded Boroxine Barriers

Goyal, Shailja; Forrester, Michael J.; Carnahan, Scott L.; Coverdell, Danielle; Torres, Sabrina; Lee, Mark W.; Rossini, Aaron J.; Cochran, Eric W.

doi:10.1021/acsapm.5c01826

Extreme Thermal Stabilization of Carborane–Cyanate Composites via B–N Dative-Bonded Boroxine Barriers

Journal Article · Wed Aug 20 00:00:00 EDT 2025 · ACS Applied Polymer Materials

DOI:https://doi.org/10.1021/acsapm.5c01826· OSTI ID:2586731

^[1]; ^[1]; Carnahan, Scott L. ^[2]; Coverdell, Danielle ^[3]; Torres, Sabrina ^[3]; Lee, Mark W. ^[4]; ^[2]; ^[1]

Iowa State Univ., Ames, IA (United States)
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Kansas City National Security Campus (KCNSC), Kansas City, MO (United States)
Twelfth Vertex LLC, Columbia, MO (United States)

Enhancing the thermal stability of cyanate ester (CE) resins is crucial for high-temperature aerospace applications. This study elucidates the degradation mechanisms of CE composites reinforced with carborane additives, focusing on the formation of boron–nitrogen (B–N) dative bonds and their role in improving thermal resistance. Using thermogravimetric analysis, we examined char formation and evolved gases at multiple degradation stages. Reaction sequences and char products were characterized via Fourier transform infrared spectroscopy (FTIR), solid-state 13C and 11B NMR, and evolved gas analysis using mass spectrometry and FTIR. The solid-state 11B NMR was instrumental in detecting various boron oxidation states and the formation of B–N dative bonds during decomposition. These bonds facilitate cross-linking in the char phase, enhancing material integrity at elevated temperatures. However, in inert environments, the volatility of boron additives like carborane limits their effectiveness. These findings advance the understanding of CE composite degradation mechanisms and offer critical insights for developing high-temperature-resistant materials for aerospace applications.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358; NA0002839

OSTI ID:: 2586731

Journal Information:: ACS Applied Polymer Materials, Journal Name: ACS Applied Polymer Materials; ISSN 2637-6105

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Fourier transform infrared spectroscopy
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dative-bond polymers
degradation
extreme-environment composites
nuclear magnetic resonance spectroscopy
solid-state NMR
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Extreme Thermal Stabilization of Carborane–Cyanate Composites via B–N Dative-Bonded Boroxine Barriers

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