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Effects of oxidative functionalization and aminosilanization of carbon nanotubes on the mechanical and thermal properties of polyamide 6 nanocomposites
Date
2013-11-13
Author
Kaynak, Cevdet
Metadata
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The focus of this study is to investigate the effects of oxidative functionalized carbon nanotubes (f-CNTs) and aminosilanized carbon nanotubes (s-CNTs) on the mechanical and thermal properties of polyamide 6 nanocomposites. Oxidation of nanotube surfaces was conducted with sulfuric acid/nitric acid mixture and then aminosilanization was carried out with -aminopropyltriethoxysilane. Nanocomposites were compounded by melt mixing technique and shaped by injection molding. Scanning electron microscopy images revealed that f-CNTs and s-CNTs were dispersed more evenly due to increased interactions with the matrix. Tensile tests indicated that yield strength and Young's modulus of nanocomposites increased 20 and 23%, respectively, with the addition of only 1 wt% s-CNTs due to very efficient load transfer from the matrix to covalently bonded CNTs. Both dynamic mechanical analysis and thermogravimetric analysis showed that surface-modified CNTs improve all thermal properties due to decreased matrix mobility and physical barrier formation. For example, increases in the storage modulus values were as much as 25%, while the increase in the thermal degradation temperatures were as much as 5 degrees C in the specimens with only 1 wt% s-CNTs.
Subject Keywords
Carbonnanotubes
,
Oxidative functionalization
,
Aminosilanization
,
Polyamide 6
URI
https://hdl.handle.net/11511/28413
Journal
Journal of Thermoplastic Composite Materials
DOI
https://doi.org/10.1177/0892705713511480
Collections
Department of Metallurgical and Materials Engineering, Article
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C. Kaynak, “Effects of oxidative functionalization and aminosilanization of carbon nanotubes on the mechanical and thermal properties of polyamide 6 nanocomposites,”
Journal of Thermoplastic Composite Materials
, pp. 1321–1333, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28413.