The synergistic effect of combining different modification methods was investigated in this study to improve the interlaminar toughness and delamination resistance of fiber reinforced polymers (FRP). Epoxy-compatible polysulfone (PSU) was end-capped with epoxide group through functionalization, and the fiber surface was chemically grafted with an amino functional group to form a micron-size rough surface. Consequently, the long chain of PSU entangles into cross-linked thermoset epoxy network, additionally, epoxide group on PSU further improves the bonding through chemical connection to the epoxy network and amino group on the fiber surface. The combined modification methods can generate both strong physical and chemical bonding. The feasibility of using this method in vacuum-assisted resin transfer molding was determined by rheometer. The impact of formed chemical bonds on the cross-linking density was examined through glass transition temperatures. The chemical modifications were characterized by Raman spectroscopy to determine the chemical structures. Synergistic effect of the modification was established by mode I and mode II fracture tests, which quantify the improvement on composites delamination resistance and toughness. The mechanism of synergy was explained based on the fracture mode and interaction between the modification methods. Finally, numerical simulation was used to compare samples with and without modifications. The experiment results showed that synergy is achieved at low concentration of modified PSU because the formed chemical bonds compensate the effect of low cross-linking density and interact with the modified fiber.
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August 2019
Research-Article
Interlaminar Toughening of Fiber-Reinforced Polymers by Synergistic Modification of Resin and Fiber
Dakai Bian,
Dakai Bian
1
Department of Mechanical Engineering,
New York, NY 10027
e-mail: db2875@columbia.edu
Columbia University
,New York, NY 10027
e-mail: db2875@columbia.edu
1Corresponding author.
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Jason C. Tsui,
Jason C. Tsui
Department of Mechanical Engineering,
New York, NY 10027
e-mail: jct2160@columbia.edu
Columbia University
,New York, NY 10027
e-mail: jct2160@columbia.edu
Search for other works by this author on:
Robert R. Kydd,
Robert R. Kydd
Department of Mechanical Engineering,
New York, NY 10027
e-mail: rrk2139@columbia.edu
Columbia University
,New York, NY 10027
e-mail: rrk2139@columbia.edu
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Y. Lawrence Yao
Y. Lawrence Yao
Department of Mechanical Engineering,
New York, NY 10027
e-mail: yly1@columbia.edu
Columbia University
,New York, NY 10027
e-mail: yly1@columbia.edu
Search for other works by this author on:
Dakai Bian
Department of Mechanical Engineering,
New York, NY 10027
e-mail: db2875@columbia.edu
Columbia University
,New York, NY 10027
e-mail: db2875@columbia.edu
Jason C. Tsui
Department of Mechanical Engineering,
New York, NY 10027
e-mail: jct2160@columbia.edu
Columbia University
,New York, NY 10027
e-mail: jct2160@columbia.edu
Robert R. Kydd
Department of Mechanical Engineering,
New York, NY 10027
e-mail: rrk2139@columbia.edu
Columbia University
,New York, NY 10027
e-mail: rrk2139@columbia.edu
D. J. Shim
Marshall Jones
Y. Lawrence Yao
Department of Mechanical Engineering,
New York, NY 10027
e-mail: yly1@columbia.edu
Columbia University
,New York, NY 10027
e-mail: yly1@columbia.edu
1Corresponding author.
Manuscript received November 29, 2017; final manuscript received October 30, 2018; published online June 13, 2019. Assoc. Editor: Y. B. Guo.
J. Manuf. Sci. Eng. Aug 2019, 141(8): 081008 (12 pages)
Published Online: June 13, 2019
Article history
Received:
November 29, 2017
Revision Received:
October 30, 2018
Accepted:
November 2, 2018
Citation
Bian, D., Tsui, J. C., Kydd, R. R., Shim, D. J., Jones, M., and Lawrence Yao, Y. (June 13, 2019). "Interlaminar Toughening of Fiber-Reinforced Polymers by Synergistic Modification of Resin and Fiber." ASME. J. Manuf. Sci. Eng. August 2019; 141(8): 081008. https://doi.org/10.1115/1.4043836
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