Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Molding Manufacturing
2.2.1. Making Plexiglass Molds
2.2.2. Making Silicone Molds
2.3. Fabrication of Standard Samples
2.3.1. Pure Epoxy Resin
2.3.2. CNT Reinforced Epoxy
2.4. Dynamic Mechanical Thermal Analysis (DMTA)
2.5. Thermogravimetric Analysis (TGA)
3. Results and Discussion
3.1. Dynamic Mechanical Thermal Analysis (DMTA)
3.2. Thermal Gravimetric Analysis (TGA)
3.3. Density
4. Conclusions
- DMTA showed that the storage modulus, loss modulus, and tanδ values increased with the increase of wt.% CNTs. The storage modulus, the loss modulus, and the tanδ of the nanocomposite sample reinforced with 0.075 wt.% CNTs increased by 43.8%, 74.4%, and 696%, respectively, compared to the pure epoxy resin. The reason why the three parameters of dissipation modulus, storage modulus and tanδ all increase with the increase of the wt.% CNTs is the energy absorption property of the CNTs.
- TGA showed that the epoxy nanocomposites were thermally stable due to the addition of CNTs. The increase in the degradation temperature of the nanocomposites is due to the strong interactions between the epoxy matrix and the CNTs, which is caused by the thermal stability of the CNTs. The pure epoxy sample has the lowest degradation temperature. By adding 0.075 wt.% CNTs to the epoxy resin, the temperature corresponding to a 10% and 50% weight loss in the pure epoxy samples increased by 14 °C and 4.3 °C, respectively. According to the results of the DTGA, the degradation temperature of the nanocomposite samples reinforced with 0.075 wt.% CNTs increased by 9 °C.
- Density measurements showed that the density of the nanocomposite samples increased by adding CNTs to the pure epoxy resin. The ratio of the actual density to the theoretical density of the nanocomposite samples reinforced with 0.025, 0.05, and 0.075 wt.% CNTs are 0.925, 0.926 and 0.927, respectively.
- The well-dispersed CNTs in the epoxy resin can strongly affect the performance of the composites. Otherwise, the CNTs cannot significantly improve the performance of the resin.
- Since CNT-reinforced epoxy matrix composites can absorb more energy through heat and can be used to reduce heat loss and resist high temperatures, which is an optimal choice for designers and engineers who want to increase the effectiveness of their products.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Diameter | 20–30 nm |
Length | 30 μm |
Functional Group | Carboxyl (COOH) |
Purity | >95 wt.% |
Impurity | <1.5 wt.% |
Sample | Tmax (°C) |
---|---|
Pure Epoxy | 355 |
Epoxy + 0.025% CNT | 362 |
Epoxy + 0.05% CNT | 363 |
Epoxy + 0.075% CNT | 364 |
Sample | T10 (°C) | T50 (°C) |
---|---|---|
Pure Epoxy | 8.333 | 372.3 |
Epoxy + 0.025% CNT | 2.345 | 372.5 |
Epoxy + 0.05% CNT | 4.346 | 376.1 |
Epoxy + 0.075% CNT | 8.347 | 376.6 |
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Najmi, L.; Hu, Z. Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites. J. Compos. Sci. 2023, 7, 313. https://doi.org/10.3390/jcs7080313
Najmi L, Hu Z. Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites. Journal of Composites Science. 2023; 7(8):313. https://doi.org/10.3390/jcs7080313
Chicago/Turabian StyleNajmi, Lida, and Zhong Hu. 2023. "Effects of Carbon Nanotubes on Thermal Behavior of Epoxy Resin Composites" Journal of Composites Science 7, no. 8: 313. https://doi.org/10.3390/jcs7080313