Volume 142, Issue 13 e56660
RESEARCH ARTICLE

Bio-Based Mono- and Difunctional Phthalonitrile Resin Foams

Caleb M. Bunton

Caleb M. Bunton

ASEE Post-Doctoral Fellow, Naval Research Laboratory of the United States, Washington, D.C, USA

Contribution: Conceptualization (lead), ​Investigation (lead), Methodology (lead)

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James D. Sitter

Corresponding Author

James D. Sitter

Federal Employee, Naval Research Laboratory of the United States, Washington, D.C, USA

Correspondence:

James D. Sitter ([email protected])

Contribution: Data curation (supporting), ​Investigation (supporting), Writing - original draft (equal), Writing - review & editing (supporting)

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Tyler J. Richardson

Tyler J. Richardson

ASEE Post-Doctoral Fellow, Naval Research Laboratory of the United States, Washington, D.C, USA

Contribution: Data curation (equal), Formal analysis (supporting), Writing - review & editing (supporting)

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Jennifer L. Dysart

Jennifer L. Dysart

Federal Employee, Naval Research Laboratory of the United States, Washington, D.C, USA

Contribution: Data curation (supporting), Formal analysis (supporting)

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Grant C. Daniels

Grant C. Daniels

Federal Employee, Naval Research Laboratory of the United States, Washington, D.C, USA

Contribution: Data curation (supporting)

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Olufolasade F. Atoyebi

Olufolasade F. Atoyebi

Nova Research Inc., Alexandria, Virginia, USA

Contribution: Data curation (supporting)

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Matthew Laskoski

Matthew Laskoski

Federal Employee, Naval Research Laboratory of the United States, Washington, D.C, USA

Contribution: Formal analysis (supporting), Funding acquisition (lead), ​Investigation (supporting), Writing - review & editing (supporting)

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First published: 16 January 2025

Funding: This work was supported by US Naval Research Laboratory (NRL) and the Office of Naval Research (ONR).

ABSTRACT

The development of two new bio-based phthalonitrile (PN) resin foams with intrinsic blowing agents is reported. The resins were characterized via attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), nuclear magnetic resonance (NMR), pycnometry, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), rheometry, and compression testing. The porosity of 3-[4-(3,4-Dicyanophenoxy)phenyl]-2-propenoic acid-phthalonitrile CAPN and 3-[3,4-di(3,4-Dicyanophenoxy)phenyl]-2-propenoic acid-phthalonitrile CFPN were calculated to be 0.610 and 0.437 respectively. Thermal and thermooxidative stability was determined for both resins under nitrogen and air environments. CAPN and CFPN displayed final char yields of 67% and 69% under nitrogen environments while the T d,5% under air environments were 200°C and 360°C respectively. Finally, compression analysis shows the CAPN to be a stiffer material than the larger CFPN foam resin.

Conflicts of Interest

The authors declare no conflicts of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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