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Effects of moisture absorption and surface modification using 3-aminopropyltriethoxysilane on the tensile and fracture characteristics of MWCNT/epoxy nanocomposites |
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| Authors: | Ji Hoon Lee Joong Hee Lee |
| Affiliation: | a School of Mechanical Engineering, Kyung Hee University, Yongin 446-701, Republic of Korea b Industrial Liaison Research Institute, School of Mechanical Engineering, College of Engineering, Kyung Hee University, Yongin 446-701, Republic of Korea c School of Advanced Materials Engineering, Chonbuk National University, Duckjin-dong 1Ga 664-14, Jeonju, Jeonbuk 561-756, Republic of Korea |
| Abstract: | In this study, we examined the tensile and fracture behaviors of multi-walled carbon nanotube (MWCNT) reinforced epoxy nanocomposites with and without moisture absorption. The MWCNT/epoxy nanocomposites were fabricated using 0.1 wt.% unmodified, oxidized, and silanized MWCNTs and were kept in seawater for over 15 weeks. Silane-modified specimens demonstrated greater tensile strength, elastic modulus, and transmittance than unmodified or acid-modified specimens, irrespective of moisture absorption. Compared to dry nanocomposites, moisture absorption decreased the tensile strength and elastic modulus for each surface modification. Fracture behavior showed similar tendencies as tensile test results. However, the fracture toughnesses of oxidized and silanized MWCNT/epoxy nanocomposites were not notably different, whereas unmodified specimens had much lower fracture toughnesses, irrespective of moisture absorption. Moisture absorption may have caused degradation resulting in weak interfacial bonding due to epoxy swelling. |
| Keywords: | Multi-walled carbon nanotubes (MWCNTs) Moisture absorption Surface modification Tensile strength Fracture toughness |
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