Ultra-high gas barrier composites with aligned graphene flakes and polyethylene molecules for high-pressure gas storage tanks

Liu, Guanjun; Fan, Yang; Liu, Wenbo; Bai, Yujiao; Han, Chuang; Wang, Peipei; Wang, Rongguo

doi:10.1016/j.est.2021.102692

Cited by 16 publications

(17 citation statements)

References 45 publications

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“…The T m of pure PE is 109 • C, and the melting temperature does not change significantly after incorporating graphene sheets [28]. The melting temperature of the graphene/PE composites increased with the increase of graphene content; the highest increase with respect to the pure PE was for the 2.0 wt% graphene/PE composite and was 3 • C [8]. This result is consistent with the variation of relative free volume fraction f r with graphene content (Figure 2c), because the T m is related to the free volume fraction.…”

Section: Thermal Properties Of Graphene/pe Compositesmentioning

confidence: 96%

“…When carbon-based nanofillers are incorporated, PE composites with improved mechanical, electrical, and thermal properties can be produced [3,4]. These PE nanocomposites have potential for applications such as static charge dissipative materials, semiconductor layers, thermal management materials, and gas barrier materials [5][6][7][8][9][10]. Within these carbon-based nanofillers, graphene has grown most rapidly due to its excellent mechanical, electrical, thermal, and barrier properties and huge surface area [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Relationship between the Microstructure and Performance of Graphene/Polyethylene Composites Investigated by Positron Annihilation Lifetime Spectroscopy

et al. 2021

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The quantitative characterization of microstructure is most desirable for the establishment of structure-property relationships in polymer nanocomposites. In this work, the effects of graphene on the microstructure, mechanical, electrical, and thermal properties of the obtained graphene/polyethylene (PE) composites were investigated. In order to reveal the structure-performance relationship of graphene/PE composites, especially for the effects of the relative free volume fraction (fr) and interfacial interaction intensity (β), positron annihilation lifetime spectroscopy (PALS) was employed for its quantitative description. The relative free volume fraction fr gives a good explanation of the variation for surface resistivity, melting temperature, and thermal stability, and the variation of tensile strength and thermal conductivity agree well with the results of interfacial interaction intensity β. The results showed that fr and β have a significant effect on the properties of the obtained graphene/PE composites, and the effect on the properties was revealed.

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Section: Thermal Properties Of Graphene/pe Compositesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Relationship between the Microstructure and Performance of Graphene/Polyethylene Composites Investigated by Positron Annihilation Lifetime Spectroscopy

et al. 2021

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Section: Resultsmentioning

confidence: 99%

“…As the degree of molecular chain orientation increases, the crystallinity of the composite can be increased by about 10%. [33] As a result, the melting temperature of the composite can increase by 1.1 $ 1.8 C. [33] It should be noted that diffraction from the (001) and (200) monoclinic planes can also be observed in the oriented composites, which is due to the martensitic transformation of HDPE. [37] During the molding process of the composites, deformation occurs, and internal stress is generated, which leads to the transformation of orthorhombic crystal to monoclinic crystal, and the monoclinic crystal can be disappeared after appropriate annealing treatment.…”

Section: Microstructures Of Gfs/hdpe Compositesmentioning

confidence: 99%

Effects of interfaces and ordered microstructures on thermal properties of graphene flakes/polyethylene composites

et al. 2022

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The lightweight type IV hydrogen storage tanks put forward higher requirements for the thermal properties of the polymer liners. To improve the thermal properties, graphene flakes (GFs) were used as fillers to reinforce high-density polyethylene (HDPE). The effects of the interfaces between GFs and polymer matrix and the ordered microstructures on the thermal properties of composites were discussed. The results showed that the ordered arrangement of the composite microstructures can significantly improve its thermal conductivity (k c ). At 0.5 wt% GFs loading, the ordered composite k c reached 6.052 W/(m K), corresponding to 11.8 times that of unoriented pure HDPE. The effect of interfaces on k c was qualitatively analyzed by scratching GFs on the cross-section of the composites. Although GFs form continuous networks with high k c in the polymer matrix, the interface defects between GFs and HDPE matrix lead to increased interfacial thermal resistance at high GFs concentrations. Therefore, the thermal enhancement coefficient of the composites decreases with the increase in GFs concentration. Moreover, mixing GFs can increase the initial thermal degradation temperature of the composites by 15.9 C and the Vicat softening point by 1.6 C. This work will provide an essential reference for the application of polymers in type IV tanks.

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“…Due to it being a powerful tool in microstructure characterization, PALS was widely used in the investigation for GPN in recent years [ 41 ], including the GPN used for nanofiltration membranes [ 42 , 43 ], gas barrier [ 44 , 45 ], gas separation [ 46 , 47 ], fuel cells [ 48 ], supercapacitors [ 49 ]. The correlation of structure and property for GPN is also focused on the f v and β , which can be obtained with the determination of τ 3 and I 2 .…”

Section: Application Of Pals In Structure-property Correlation For Gpnmentioning

confidence: 99%

Application Progress of PALS in the Correlation of Structure and Properties for Graphene/Polymer Nanocomposites

et al. 2022

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Giving a deep insight into the microstructure, and realizing the correlation between microstructure and properties is very important to the precise construction of high-performance graphene/polymer nanocomposites (GPN). For the promising application in microstructure characterization, much attention has been focused on the effective technique of positron annihilation lifetime spectroscopy (PALS). Based on the introduction of the basic principle, this review summarized the application progress of PALS in the correlation of microstructure and properties for GPN, especially for the characterization of free volume and interfacial interaction, and the correlation of these microstructures and properties.

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Ultra-high gas barrier composites with aligned graphene flakes and polyethylene molecules for high-pressure gas storage tanks

Cited by 16 publications

References 45 publications

Relationship between the Microstructure and Performance of Graphene/Polyethylene Composites Investigated by Positron Annihilation Lifetime Spectroscopy

Relationship between the Microstructure and Performance of Graphene/Polyethylene Composites Investigated by Positron Annihilation Lifetime Spectroscopy

Effects of interfaces and ordered microstructures on thermal properties of graphene flakes/polyethylene composites

Application Progress of PALS in the Correlation of Structure and Properties for Graphene/Polymer Nanocomposites

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