File:Environmental degradation of structured nanocomposites (IA environmentaldeg1094553038).pdf
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Summary[edit]
Environmental degradation of structured nanocomposites
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| Author |
Rockford, Stephanie M. |
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| Title |
Environmental degradation of structured nanocomposites |
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| Publisher |
Monterey, California: Naval Postgraduate School |
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| Description |
Epoxy resin nanocomposites are currently being used in multiple structural and multifunctional applications. However, the amount of data known regarding their degradation due to atmospheric conditions (UV light, humidity, temperature) is very limited. This study aims to characterize the change in properties as result of environmental factors by examining the effects suffered by epoxy resins containing nano-fillers when exposed to augmented weather conditions. To achieve that goal, neat epoxy resin specimens and epoxy resin samples loaded with 1% of carbon nanotubes, silica nanoparticles, nickel or nickel/nickel oxide nano-powder were fabricated, and their properties compared. The samples were exposed to three cycles, totaling 246 hours, of UV light and humidity in a QUV accelerated weather chamber and to salt spray in a salt fog chamber. After each exposure cycle, the samples were characterized using optical microscopy, microhardness tests, tensile tests, scanning electron microscopy, and Fourier transform infrared spectroscopy. The specimen's electrical conductivity was measured using a four-point probe. The sample analysis after exposure showed changes in the nanocomposite surface structure and microstructure-increase in hardness; loss of ultimate tensile strength, in particular for the carbon nanotube composite; and dramatic changes in the Young's modulus among all samples but little change to their sheet resistance. The nanocomposite formulations were also deposited on the surface of 315L stainless steel shim to determine the effects of the augmented weather conditions in the epoxy nanocomposite-metallic pair. Recommendations for future research include examining various composite loadings, developing protocols to achieve better dispersion of fillers on the resin and lengthening exposure times. Subjects: nanocomposite; nano; nanotubes; CNT; MWCNT; carbon; nickel; nickel oxide; epoxy; UV; humidity; condensation; salt fog; degradation; exposure |
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| Language | English | |
| Publication date | March 2017 | |
| Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
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| Accession number |
environmentaldeg1094553038 |
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| Source | ||
| Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. | |
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| current | 02:19, 20 July 2020 |  | 1,275 × 1,650, 88 pages (3.31 MB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection environmentaldeg1094553038 (User talk:Fæ/IA books#Fork8) (batch 1993-2020 #15270) |
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