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Synergetically Improving the Strength and the Toughness of Epoxy Based Composites with Multiscale Reinforcements for Direct Extrusion Fabrication

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Abstract

In this paper, a new type of epoxy based composites, which is modified by multiscale reinforcements, for Direct Extrusion Fabrication (DEF) is developed. In the composites, micron-sized fillers-Carbon Fibers (CFs) were treated by ball milling and liquid-phase-oxidation/sonication methods in order to enhance the surface roughness and improve the interfacial interactions. In this way, both the tensile strength and Young’s modulus were increased. A modified Halpin-Tsai model was presented to predict the Young’s modulus of multiscale reinforced composites with both micron-sized and nano-sized reinforcements. However, the improvement of toughness was limited. In order to increase the toughness without sacrificing other properties, nano-sized fillers—rubber nano-particles (RNPs) and carbon nano-tubes (CNTs) were added. Mechanical experiments and scanning electron microscopy (SEM) observations were used to study the effects of the micron-sized, nano-sized reinforcements and their combination on tensile and toughness properties of the composites. The results showed that the combined use of multiscale reinforcements had synergetic effects on both the strength and the toughness of the composites.

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Authors and Affiliations

  1. College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha, 410073, China

    Xin Li, Jianzhong Shang, Rong Wang & Zhuo Wang

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  1. Xin Li
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  2. Jianzhong Shang
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  4. Zhuo Wang
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Correspondence to Jianzhong Shang.

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Li, X., Shang, J., Wang, R. et al. Synergetically Improving the Strength and the Toughness of Epoxy Based Composites with Multiscale Reinforcements for Direct Extrusion Fabrication. Polym. Sci. Ser. A 60, 239–248 (2018). https://doi.org/10.1134/S0965545X18020086

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  • DOI: https://doi.org/10.1134/S0965545X18020086

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