Comprehensive research on mechanical and gas barrier properties of nylon6 liner strengthened by multi-walled carbon nanotubes

The polymer liner of the type IV hydrogen storage vessel has high gas permeability and faces drastic temperature changes during the high-pressure cycle. MWCNTs and MWCNTs-NH2 were added to PA6 to comprehensively improve the matrix's gas barrier properties and mechanical properties. By establish...

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Veröffentlicht in:Materials today communications 2024-12, Vol.41, p.111052, Article 111052
Hauptverfasser: Liang, Jianguo, Wu, Yuqi, Chen, Zhanchun, Wu, Ting, Li, Yinhui, Zhao, Chunjiang, Zhao, Runtian, Li, Wenzheng
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Sprache:eng
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Zusammenfassung:The polymer liner of the type IV hydrogen storage vessel has high gas permeability and faces drastic temperature changes during the high-pressure cycle. MWCNTs and MWCNTs-NH2 were added to PA6 to comprehensively improve the matrix's gas barrier properties and mechanical properties. By establishing and calculating the material models, it was found that adding carbon nanotubes can reduce the free volume fraction, solubility coefficient and diffusion coefficient of materials at different temperatures. Mechanical properties and thermal analysis were conducted, and the fracture morphology was observed. It was found that when the nano-filler content was 1 wt%, the tensile mechanical properties of the material were significantly improved at all temperatures, the filler was uniformly dispersed in the matrix, resulting in enhanced thermal stability compared to PA6. The impact performance of the composite materials was only enhanced at 358 K compared to PA6. Furthermore, MWCNTs-NH2 exhibited the best enhancement effect on the matrix properties. PA6, 1 wt%MWCNTs/PA6 and 1 wt%MWCNTs-NH2/PA6 materials were selected for oxygen penetration experiments. It was found that the permeability coefficient of the composite material was reduced by about 90 % compared to that of PA6. The trend of the experimental results was completely consistent with the simulated results, which verified the reliability of the simulation. The simulation results showed that the permeability coefficients of the composites decreased by 85.95–88.22 % at 233 K and by 98.54–98.73 % at 358 K, with the enhancement effect of MWCNT-NH2 being more significant. This study provides a reference for improving the mechanical and gas barrier properties of PA6 at different temperatures. [Display omitted] •The dissolution and diffusion processes of gas in PA6 and composites were compared.•The mechanism of enhancing gas barrier properties of PA6 by MWCNTs was analyzed.•The experimental results of MWCNTs/PA6 are in good agreement with the simulation.•The effects of MWCNTs on the mechanical properties of PA6 at 233 and 358 K were tested.•The enhancement effects of MWCNT-NH2 and MWCNTs on PA6 performance were compared.
ISSN:2352-4928
2352-4928
DOI:10.1016/j.mtcomm.2024.111052