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Mechanical properties and toughness of carbon aerogel/epoxy polymer composites

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Abstract

Because of their nanoporous structure and large surface area, carbon aerogels have high potential for improving the material properties of polymer-based composites. In the present study, the mechanical properties and toughness of epoxy polymers modified with an aerogel content of 0.0–0.5 wt% were considered. Experimental results showed that the stiffness and strength of the carbon aerogel toughened polymers steadily increased with the carbon aerogel content. The glass transition temperature of the unmodified epoxy polymer was 147 °C, and it was not appreciably affected by the addition of carbon aerogels. Blending the carbon aerogels with the epoxy polymer led to an appreciably improvement in the fracture performance of the resulting composites. For example, the fracture energy of the unmodified polymer was 125 J m−2, whereas that of an epoxy polymer reinforced with a carbon aerogel content of 0.3 wt% was 255 J m−2. The mechanisms responsible for the toughness enhancement were identified by studying the fracture surfaces using field emission gun scanning electron microscopy. Crack pinning, crack deflection, interfacial debonding, and plastic void growth were the main toughening mechanisms in the carbon aerogel toughened epoxy polymers.

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Acknowledgements

The authors would like to thank the National Science Council, Taiwan, for financially supporting this research under a Contract No. NSC-102-2221-E-151-056.

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Authors and Affiliations

  1. Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, No. 415, Jiangong Rd., Sanmin Dist., Kaohsiung City, 807, Taiwan, ROC

    Tsung-Han Hsieh & Yau-Shian Huang

  2. Department of Aviation Mechanical Engineering, China University of Science and Technology, No. 200, Zhonghua St., Hengshan Township, Hsinchu County, 312, Taiwan, ROC

    Ming-Yuan Shen

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  1. Tsung-Han Hsieh
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  2. Yau-Shian Huang
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  3. Ming-Yuan Shen
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Correspondence to Tsung-Han Hsieh.

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Hsieh, TH., Huang, YS. & Shen, MY. Mechanical properties and toughness of carbon aerogel/epoxy polymer composites. J Mater Sci 50, 3258–3266 (2015). https://doi.org/10.1007/s10853-015-8897-0

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  • DOI: https://doi.org/10.1007/s10853-015-8897-0

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