scholarly journals Thermal Stability and Flammability of Epoxy Composites Filled with Multi-Walled Carbon Nanotubes, Boric Acid, and Sodium Bicarbonate

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 638
Author(s):  
Olga B. Nazarenko ◽  
Yulia A. Amelkovich ◽  
Alexander G. Bannov ◽  
Irina S. Berdyugina ◽  
Visakh P. Maniyan
Keyword(s):  
Carbon Nanotubes ◽  
Sodium Bicarbonate ◽  
Boric Acid ◽  
Hardness Test ◽  
Epoxy Composites ◽  
Thermooxidative Stability ◽  
Epoxy Polymers ◽  
Thermooxidative Destruction ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Epoxy composites filled with 0.5 wt% of multi-walled carbon nanotubes (MWCNTs), 10 and 15 wt% of boric acid and sodium bicarbonate separately, as well as composites filled with a combination of MWCNTs-boric acid and MWCNTs-sodium bicarbonate were prepared. The thermal behavior of the prepared samples was investigated under heating in oxidative environment using thermogravimetric analysis. The hardness was measured using the Shore D hardness test. To evaluate the flammability of the samples, the ignition temperature and time-to-ignition were determined. It was concluded that sodium bicarbonate in the studied concentrations (10 and 15 wt%) is not appropriate for use as a filler capable of improving the thermooxidative stability and reducing the flammability of epoxy polymers. The improvement in the thermal properties can be achieved by using the combination of boric acid and multi-walled carbon nanotubes as fillers. The thermooxidative destruction of the samples filled with boric acid passes more slowly and more evenly via the formation of B2O3 as a result of its decomposition.

scholarly journals Thermal Behavior and Flammability of Epoxy Composites Based on Multi-Walled Carbon Nanotubes and Expanded Graphite: A Comparative Study

2020 ◽  
Vol 10 (19) ◽  
pp. 6928
Author(s):  
Alexander G. Bannov ◽  
Olga B. Nazarenko ◽  
Evgeny A. Maksimovskii ◽  
Maxim V. Popov ◽  
Irina S. Berdyugina
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Behavior ◽  
Epoxy Resin ◽  
Ignition Temperature ◽  
Oxidation Stability ◽  
Expanded Graphite ◽  
Hardness Test ◽  
Epoxy Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Reduction of flammability and improvement of thermal stability of polymers during heating can be achieved by the introduction of fillers. Epoxy composites filled with different loadings of multi-walled carbon nanotubes (MWCNTs) and expanded graphite (EG) were prepared. The thermal oxidation stability of the prepared samples was investigated under heating in an oxidizing atmosphere using thermal analysis. The hardness was measured using the Shore D hardness test. The flammability of the prepared composites was evaluated by the ignition temperature and time-to-ignition. It was found that there was a rise in temperature corresponding to a 5% weight loss during heating for both epoxy/MWCNT and epoxy/EG composites compared to neat epoxy resin. The Shore D hardness of epoxy/MWCNT composites increased with content growth up to 0.1 wt.% and decreased with further concentration rise. The addition of MWCNTs and EG leads to an increase in the ignition temperature. It has been shown that MWCNTs improve the thermal behavior of epoxy resin in a low temperature region (below ~300 °C) whereas EG shows almost the same thermal behavior above 300 °C. The improvement of thermal properties can be achieved using MWCNTs and EG as fillers.

The influence of functionalization time of carbon nanotube on the mechanical properties of the epoxy composites

2017 ◽  
Vol 51 (12) ◽  
pp. 1693-1701 ◽  
Author(s):  
EA Zakharychev ◽  
EN Razov ◽  
Yu D Semchikov ◽  
NS Zakharycheva ◽  
MA Kabina
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Composite Materials ◽  
Polymer Composites ◽  
Epoxy Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This paper investigates the structure, length, and percentage of functional groups of multi-walled carbon nanotubes (CNT) depending on the time taken for functionalization in HNO3 and H2SO4 mixture. The carbon nanotube content and influence of functionalization time on mechanical properties of polymer composite materials based on epoxy matrix are studied. The extreme dependencies of mechanical properties of carbon nanotube functionalization time of polymer composites were established. The rise in tensile strength of obtained composites reaches 102% and elastic modulus reaches 227% as compared to that of unfilled polymer. The composites exhibited best mechanical properties by including carbon nanotube with 0.5 h functionalization time.

Impedance characterization and microwave permittivity of multi-walled carbon nanotubes/BaTiO3/epoxy composites

2020 ◽  
Vol 126 (10) ◽  
Author(s):  
Ludmila L. Vovchenko ◽  
Oleg V. Lozitsky ◽  
Ludmila Y. Matzui ◽  
Viktor V. Oliynyk ◽  
Volodymyr V. Zagorodnii ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Epoxy Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Impedance Characterization ◽  
Microwave Permittivity

Static and Fatigue Strengths of Carbon Nanotube/Epoxy Composites under Hygrothermal Environments

2013 ◽  
Vol 284-287 ◽  
pp. 204-210
Author(s):  
Yi Ming Jen ◽  
Chien Yang Huang
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Stress Concentration ◽  
Interfacial Adhesion ◽  
Epoxy Composites ◽  
Hygrothermal Effect ◽  
Multi Walled Carbon Nanotubes ◽  
Hygrothermal Environments ◽  
Stress Concentration Effect ◽  
Walled Carbon Nanotubes

This study experimentally analyzed the hygrothermal effect on the static and fatigue strengths of acid-treated multi-walled carbon nanotubes (CNTs)/epoxy composites. The nanocomposite specimens with various CNT contents (0., 0.5, and 1.0 wt.%) were statically and fatigue-tested under three different hygrothermal conditions (25 °C/60% RH, 25° C/85% RH, and 40 °C/85% RH) to investigate the influences of hygrothermal conditions and CNT contents on the tensile static and fatigue strengths of the studied nanocomposites. The results show that the static and fatigue strengths decreased slightly at 25 °C/85% RH environments compared with those tested under the 25 °C/60% RH condition. However, the static and fatigue strengths of the studied nanocomposites decreased substantially under the 40 °C/85% RH condition. The combined temperature and humidity environments weaken the interfacial adhesion between the CNT surfaces and the epoxy matrix. Moreover, the experimental results show that the addition of 0.5 wt.% of carbon nanotubes improved the static and fatigue strengths considerably under the same hygrothermal environments. However, when an excessive amount of CNTs was used (1.0 wt.%), the nanocomposite exhibited the lowest strengths compared with the specimens with 0 and 0.5 wt.% CNTs. The stress concentration effect caused by the CNT aggregates was detrimental to the static and fatigue strengths of the studied nanocomposites.

Sign in / Sign up

Export Citation Format

Share Document