Volume 35, Issue 12 e70017

RESEARCH ARTICLE

The Role of Hydroxy Substituent Position in Hydroxybenzonitrile Homologs on the Curing Behavior and Mechanical Properties of Cyanate Ester Resins

Jun Jiang,

Jun Jiang

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Xiaofang Tao,

Xiaofang Tao

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Yiming Zhao,

Yiming Zhao

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Dingding Chen,

Dingding Chen

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Changping Yin,

Changping Yin

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Jun Tang,

Corresponding Author

Jun Tang

[email protected]

orcid.org/0000-0003-0133-8305

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

Correspondence:

Jun Tang ([email protected])

Suli Xing ([email protected])

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Suli Xing,

Corresponding Author

Suli Xing

[email protected]

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

Correspondence:

Jun Tang ([email protected])

Suli Xing ([email protected])

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Jun Jiang,

Jun Jiang

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

Search for more papers by this author

Xiaofang Tao,

Xiaofang Tao

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Yiming Zhao,

Yiming Zhao

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Dingding Chen,

Dingding Chen

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Changping Yin,

Changping Yin

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

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Jun Tang,

Corresponding Author

Jun Tang

[email protected]

orcid.org/0000-0003-0133-8305

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

Correspondence:

Jun Tang ([email protected])

Suli Xing ([email protected])

Search for more papers by this author

Suli Xing,

Corresponding Author

Suli Xing

[email protected]

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China

Correspondence:

Jun Tang ([email protected])

Suli Xing ([email protected])

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First published: 01 December 2024

https://doi.org/10.1002/pat.70017

Funding: This work was supported by Innovation Science Foundation of National University of Defense Technology, 22-ZZCX-076. Project for excellent young scientist in College of Aerospace Science and Engineering of National University of Defense Technology, KY0505072210.

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ABSTRACT

The application of cyanate esters has been greatly limited by their high curing temperatures, which induce residual thermal stress and subsequently degrade their mechanical properties. In this study, hydroxybenzonitrile homologs (HBN_x) were developed to reduce curing temperature of bisphenol E cyanate ester (BECE) while improving their mechanical properties. It was found that the position of hydroxy (-OH) substituent in HBN_x had a significant impact on the curing temperature of BECE. Among the homologs, ortho-hydroxybenzonitrile (HBN₂) demonstrated the highest reactivity, as indicated by quantum chemical calculations and confirmed by differential scanning calorimetry analysis. As a result, the curing temperature of BECE was effectively reduced from 250°C to 140°C with the addition of 15 wt% HBN₂. Additionally, the addition of HBN_x improved the mechanical properties of cyanate ester resins and their composites reinforced by quartz fibers (GF). Specifically, the mechanical properties of HBN_x/BECE castings remained at high levels, with impact strength, tensile strength, and flexural strength measured at 38.6 kJ/m², 94.5, and 100.0 MPa, respectively. Furthermore, the mechanical properties of GF/HBN_x/BECE composites exhibited an overall improvement, with the maximum enhancements in short-beam shear strength, tensile strength, and flexural strength reaching 78.0%, 27.3%, and 45.1%, respectively. Nevertheless, the hydroxy substituent position in HBN_x had a relatively minor impact on these mechanical properties. This study presents a promising strategy for synergistically enhancing both the processability and mechanical properties of CE resins and their composites in a cost-effective manner.

Conflicts of Interest

The authors declare no conflicts of interest.

Open Research

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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Volume35, Issue12

December 2024

e70017

The Role of Hydroxy Substituent Position in Hydroxybenzonitrile Homologs on the Curing Behavior and Mechanical Properties of Cyanate Ester Resins

ABSTRACT

Conflicts of Interest

Open Research

Data Availability Statement

References

References

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The Role of Hydroxy Substituent Position in Hydroxybenzonitrile Homologs on the Curing Behavior and Mechanical Properties of Cyanate Ester Resins

ABSTRACT

Conflicts of Interest

Open Research

Data Availability Statement

References

References

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