Weathering of a carbon nanotube/epoxy nanocomposite under UV light and in water bath: impact on abraded particles

Nanoscale ◽  
2015 ◽  
Vol 7 (44) ◽  
pp. 18524-18536 ◽  
Author(s):  
Lukas Schlagenhauf ◽  
Bahareh Kianfar ◽  
Tina Buerki-Thurnherr ◽  
Yu-Ying Kuo ◽  
Adrian Wichser ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Surface Properties ◽  
Uv Light ◽  
Water Bath ◽  
Epoxy Nanocomposite ◽  
Weathering Processes ◽  
Properties Of Composites

Weathering processes can influence the surface properties of composites with incorporated nanoparticles.

scholarly journals Weathering Stability and Durability of Birch Plywood Modified with Different Molecular Weight Phenol-Formaldehyde Oligomers

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 175
Author(s):  
Juris Grinins ◽  
Vladimirs Biziks ◽  
Brendan Nicholas Marais ◽  
Janis Rizikovs ◽  
Holger Militz
Keyword(s):  
Uv Light ◽  
Phenol Formaldehyde ◽  
Wood Decay ◽  
Soft Rot ◽  
Solid Wood ◽  
Solid Content ◽  
Molecular Weights ◽  
Weathering Processes ◽  
Commercial Resin ◽  
D 20

This study investigated the effect of phenol-formaldehyde (PF) resin treatment on the weathering stability and biological durability of birch plywood. Silver birch (Betula pendula) veneers were vacuum-pressure impregnated with four different PF resins with average molecular weights (Mw) of 292 (resin A), 528 (resin B), 703 (resin C), and 884 g/mol (resin D). The aging properties of PF resin modified birch plywood were analyzed using artificial weathering with ultraviolet (UV) light, UV and water spray, and weathering under outdoor conditions. The same combinations of PF-treated plywood specimens were then tested in soil-bed tests to determine their resistance against soft-rot wood decay. It was not possible to compare weathering processes under artificial conditions to processes under outdoor conditions. However, the weathering stability of birch plywood treated with PF resins A, B, and C, scored better than plywood treated with commercial resin D (regardless of solid content concentration [%]). Results from unsterile soil bed tests showed improvements in resistance to soft-rot wood decay compared to untreated plywood and solid wood. Mass loss [%] was lowest for birch plywood specimens treated with resin of highest solid content concentration (resin D, 20%). Provisional durability ratings delivered durability class (DC) ratings of 2–3, considerably improved over untreated solid wood and untreated birch plywood (DC 5).

scholarly journals Effect of structure regulation of hyper-branched polyester modified carbon nanotubes on toughening performance of epoxy/carbon nanotube nanocomposites

RSC Advances ◽  
2019 ◽  
Vol 9 (23) ◽  
pp. 12864-12876 ◽  
Author(s):  
Lu Li ◽  
Xia Liao ◽  
Xingyue Sheng ◽  
Zengheng Hao ◽  
Leilei He ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Epoxy Resin ◽  
Hyperbranched Polyesters ◽  
Structure Regulation ◽  
Modified Carbon Nanotubes ◽  
Effect Of Structure ◽  
Properties Of Composites

Carboxylic carbon nanotubes were modified by a series of hyperbranched polyesters (HBP), and epoxy resin/carbon nanotubes composites were prepared. The effect of structure regulation of HBP on toughening properties of composites was discussed.

Modeling of creep for multiwall carbon nanotube/epoxy nanocomposite

2013 ◽  
Vol 129 (6) ◽  
pp. 3314-3324 ◽  
Author(s):  
Tatiana Glaskova ◽  
Klara Aniskevich ◽  
Anna Borisova
Keyword(s):  
Carbon Nanotube ◽  
Multiwall Carbon Nanotube ◽  
Epoxy Nanocomposite ◽  
Multiwall Carbon

Damping characteristics of carbon nanotube reinforced epoxy nanocomposite beams

2021 ◽  
Vol 166 ◽  
pp. 108127
Author(s):  
Shengqi Pan ◽  
Qiyi Dai ◽  
Babak Safaei ◽  
Zhaoye Qin ◽  
Fulei Chu
Keyword(s):  
Carbon Nanotube ◽  
Epoxy Nanocomposite ◽  
Damping Characteristics

Viscoelastic Properties of Multi Walled Carbon Nanotube/Epoxy Composites at the Different Nanotube Content

2011 ◽  
Vol 13 ◽  
pp. 33-39 ◽  
Author(s):  
Arash Montazeri ◽  
Alireza Khavandi ◽  
Jafar Javadpour ◽  
Abbas Tcharkhtchi
Keyword(s):  
Carbon Nanotube ◽  
Viscoelastic Properties ◽  
Epoxy Composite ◽  
Viscoelastic Behavior ◽  
Molding Process ◽  
Cole Diagram ◽  
Multi Walled Carbon Nanotube ◽  
Viscoelastic Modeling ◽  
Good Agreement ◽  
Properties Of Composites

The viscoelastic properties of composites multi walled carbon nanotube / epoxy at different weight fractions (0.1, 0.5 and 1wt %) were evaluated by performing dynamic mechanical thermal analysis (DMTA) test. The MWCNT/ epoxy composite were fabricated by sonication and a cast molding process. The results showed that addition of nanotubes to epoxy had a significant effect on the viscoelastic properties. However, the use of 0.5wt% increased the viscoelastic properties more significantly. Concerning viscoelastic modeling, the COLE-COLE diagram has been plotted by the result of DMTA tests. These results show a good agreement between the Perez model and the viscoelastic behavior of the composite.

Fabrication and high radiation-resistant properties of functionalized carbon nanotube reinforced novolac epoxy resin nanocomposite coatings

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58296-58301 ◽  
Author(s):  
Shuquan Chang ◽  
Jin Li ◽  
Wei Han ◽  
Zheng Zhang ◽  
Ling Chang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Epoxy Resin ◽  
Radiation Resistance ◽  
Nanocomposite Coatings ◽  
High Radiation ◽  
Epoxy Nanocomposite ◽  
Radiation Resistant ◽  
Functionalized Carbon Nanotube ◽  
Novolac Epoxy

Functionalized MWCNT/novolac epoxy nanocomposite coatings with high radiation resistance were successfully fabricated and studied.

Self-Healing Glass Fibres with Carbon Nanotube-Epoxy Nanocomposite Coating

2007 ◽  
Vol 334-335 ◽  
pp. 805-808 ◽  
Author(s):  
Naveed A. Siddiqui ◽  
Jang Kyo Kim ◽  
Farjaad Muzaffar ◽  
Arshad Munir
Keyword(s):  
Tensile Strength ◽  
Carbon Nanotube ◽  
Strength Distribution ◽  
Neat Epoxy ◽  
Self Healing ◽  
Stress Concentrations ◽  
Clear Trend ◽  
Epoxy Nanocomposite ◽  
Glass Fibres ◽  
The Individual

This paper reports a study based on a novel concept of ‘self-healing’ coatings applied onto the brittle fibre surface to reduce the stress concentrations and thus to improve the reinforcing efficiency in a composite. The individual E-glass fibres as well as rovings were coated with a carbon nanotube (CNT) reinforced epoxy composite. The tensile strengths were measured for the individual and bundle fibres, which were treated statistically to determine the Weibull parameters and thus to evaluate the notch sensitivity of the fibres with and without coating. The results indicate that the tensile strength of the individual fibre increased by 10% after coating with neat epoxy. Coating with epoxy nanocomposite containing 0.3wt% MWNT further improved the tensile strength. However, increasing the nanotube content was not necessarily beneficial due to the formation of nanotube agglomerates within the matrix. The tensile tests on fibre roving also showed a clear trend of beneficial effect of nanocomposite impregnation on tensile strength. The rovings impregnated with nanocomposite exhibited a more uniform strength distribution and higher strengths than those impregnated with neat epoxy. Changes in prevailing failure mechanisms influenced by the epoxy and nanocomposite coatings are identified.

A Lab-on-a-Chip Device Using a Dielectrophoresis-Aligned Carbon Nanotube Sensor Array

2011 ◽  
Author(s):  
Pengfei Li ◽  
Nan Lei ◽  
Jie Xu ◽  
Wei Xue
Keyword(s):  
Carbon Nanotube ◽  
Sensor Array ◽  
Uv Light ◽  
Lab On A Chip ◽  
High Sensitivity ◽  
Metal Electrodes ◽  
Flow Sensors ◽  
Single Walled Carbon Nanotube ◽  
Ph Values

Here we report the design, fabrication, and characterization of a lab-on-a-chip device using a nanotube-based sensor array. The microfluidic components are composed of an ultraviolet (UV) light-defined, cross-linked SU-8 microchannel and a polydimethylsiloxane (PDMS) top cover. The hybrid microfluidic structure provides a fully sealed microchannel, well-aligned features, and precisely positioned nanosensors. Well-organized single-walled carbon nanotube (SWNT) thin films are deposited and aligned across the electrodes on a silicon substrate with dielectrophoresis. The assembly of SWNTs is carried out in a sealed microchannel. The SWNT devices are configured as two-terminal resistor-type sensors with the metal electrodes as the probing pads and the dielectrophoretically captured SWNTs as the sensing elements. The SWNT devices are used as integrated flow sensors to monitor the flow rate in the microchannel. In addition, when exposed to aqueous solutions with various pH values, these sensors change their resistance accordingly and demonstrate high sensitivity towards pH solutions.

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