Tuning Epoxy Thermomechanics via Thermal Isomerization: A Route to Negative Coefficient of Thermal Expansion Materials

Foster, Jeffrey C.; Staiger, Chad L.; Dugger, Jason W.; Redline, Erica M.

doi:10.1021/acsmacrolett.1c00312

Tuning Epoxy Thermomechanics via Thermal Isomerization: A Route to Negative Coefficient of Thermal Expansion Materials

Journal Article · Fri Jul 02 00:00:00 EDT 2021 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.1c00312· OSTI ID:1810360

^[1]; Staiger, Chad L. ^[1]; Dugger, Jason W. ^[1]; ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Fine control over the thermal expansion and contraction behavior of polymer materials is challenging. Most polymers have large coefficients of thermal expansion (CTEs), which preclude long performance lifetimes of composite materials. Herein, we report the design and synthesis of epoxy thermosets with low CTE values below their T_g and large contraction behavior above T_g by incorporating thermally contractile dibenzocyclooctane (DBCO) motifs within the thermoset network. This atypical thermomechanical behavior was rationalized in terms of a twist-boat to chair conformational equilibrium of the DBCO linkages. We anticipate these findings to be generally useful in the preparation of materials with designed CTE values.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1810360

Report Number(s):: SAND--2021-7979J; 697211

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 7 Vol. 10; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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