Journal
RSC ADVANCES
Volume 12, Issue 20, Pages 12427-12435Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra01943d
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Funding
- National Natural Science Foundation of China [20976032, 21076049]
- Youth Science and Technology Fund of Gansu [20JR5ERE647]
- Datong City Science and Technology Research project [2020013]
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The surfactant-assisted preparation of carbon nanotube (CNT)/polymer composites has attracted attention worldwide. In this study, CNT/epoxy nanocomposites were prepared using sodium carboxymethyl cellulose (CMC) and the effect of CMC on the curing behaviors of epoxy resin (E44) and CNTs/E44 was investigated. The curing kinetics of the CMC/CNTs/E44 systems were examined using methods where the activation energy (E) is a constant and where E is a variable, respectively. The dynamic mechanical properties of the composites were also compared. It was found that CMC/E44 had a higher storage modulus (E-m) while the CMC/CNTs/E44 system had a higher glass transition temperature (T-g) and damping factor (tan delta).
The surfactant-assisted preparation of carbon nanotube (CNT)/polymer composites has attracted the attention of scientists around the world. Here, CNT/epoxy nanocomposites were prepared using sodium carboxymethyl cellulose (CMC). The effect of CMC on the curing behaviors of epoxy resin (E44) and CNTs/E44 was studied using differential scanning calorimetry (DSC). The curing kinetics of the CMC/CNTs/E44 systems were examined using methods where the activation energy (E) is a constant and where E is a variable, respectively. The change of E with the conversion (alpha) was calculated using the Starink isoconversional method. For the E44 system, a significant variation of E was observed when the conversion increased from 0.05 to 0.95. The E variable method was introduced to this system to describe this phenomenon. In contrast to the method where E is a constant, the E variable method has better agreement with the experimental data. With these two methods, the curing kinetics of the CMC/CNTs/epoxy system can be understood comprehensively and accurately. Ultimately, the dynamic mechanical properties of neat E44, CMC/E44 and CMC/CNTs/E44 were investigated and compared, which showed that CMC/E44 had a higher storage modulus (E-m) than the neat E44 and CMC/CNTs/E44 systems, and the CMC/CNTs/E44 system had a higher glass transition temperature (T-g) and damping factor (tan delta) than the neat E44 and CMC/E44 systems.
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