Mechanical properties and toughness of carbon aerogel/epoxy polymer composites

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 co...

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Bibliographic Details
Published in:Journal of materials science 2015-04, Vol.50 (8), p.3258-3266
Main Authors: Hsieh, Tsung-Han, Huang, Yau-Shian, Shen, Ming-Yuan
Format: Article
Language:English
Subjects:
Aerogels
Carbon
Carbon-epoxy composites
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crack propagation
Crystallography and Scattering Methods
Emission analysis
Epoxy resins
Field emission microscopy
Fracture surfaces
Fracture toughness
Glass transition temperature
Material properties
Materials Science
Mechanical properties
Original Paper
Polymer matrix composites
Polymer Sciences
Polymers
Scanning electron microscopy
Solid Mechanics
Stiffness
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-8897-0