Hexagonal crystalline nanofillers reinforced composite carbon nanofibers with optimized crystal structure and improved mechanical properties

Zhang, Ye; Zhu, Bo; Cai, Xiaoqing; Qiao, Ke; Du, Hengke; Zhou, Mingzhe; Yan, Shuhan; Sun, Na; Liang, Xuechen

doi:10.1016/j.compositesa.2023.107632

Cited by 6 publications

(13 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crystal structure of the as-spun nanofibers is characterized by the XRD technique. Two typical diffraction peaks associated with the PAN crystal can be fitted in the XRD patterns of as-spun nanofibers, where the sharp peak at around 17° results from the (100) crystal planes of PAN, and the diffuse peak at around 26° is caused by the amorphous polymer matrix (Figure j) . Besides, in the XRD patterns of composite as-spun nanofibers, the (002) diffraction peak at around 27.5° can be detected as the addition of DAP/CA exceeds 20 wt % or TAP/BA exceeds 3 wt %, which further confirms the synthesis of self-assembly supramolecular seeds DC/DMF and TB/DMF in the fiber matrix.…”

Section: Resultssupporting

confidence: 59%

“…Two typical diffraction peaks associated with the PAN crystal can be fitted in the XRD patterns of as-spun nanofibers, where the sharp peak at around 17°results from the (100) crystal planes of PAN, and the diffuse peak at around 26°is caused by the amorphous polymer matrix (Figure 4j). 8 Besides, in the XRD patterns of composite as-spun nanofibers, the (002) diffraction peak at around 27.5°can be detected as the addition of DAP/CA exceeds 20 wt % or TAP/BA exceeds 3 wt %, which further confirms the synthesis of self-assembly supramolecular seeds DC/DMF and TB/DMF in the fiber matrix. Moreover, the variation in the detection concentrations of DC/DMF and TB/DMF demonstrates that compared to the DAP/CA system, TAP/BA can form relatively larger seeds at relatively lower concentrations.…”

Section: Acsmentioning

confidence: 61%

“…The crystallinity of aPAN, aP/D/C-5, and aP/T/B-5 is calculated based on their XRD patterns (Figures l and S14). It indicates that the in situ synthesis of either DC/DMF or TB/DMF in as-spun nanofibers promotes fiber crystallization, which is deduced to be due to the fact that the self-assembly supramolecular seeds with ordered layer-stacked graphitic lattice planes can improve the alignment and orientation of PAN molecular chain segments through the PAN–seed interaction and at the same time provide nucleation sites for the crystallization of PAN (Figure m) . On this basis, the crystallinity of aP/D/C-5 is higher than that of aP/T/B-5.…”

Section: Resultsmentioning

confidence: 97%

“…It indicates that the in situ synthesis of either DC/DMF or TB/DMF in as-spun nanofibers promotes fiber crystallization, which is deduced to be due to the fact that the self-assembly supramolecular seeds with ordered layer-stacked graphitic lattice planes can improve the alignment and orientation of PAN molecular chain segments through the PAN−seed interaction and at the same time provide nucleation sites for the crystallization of PAN (Figure 4m). 8 On this basis, the crystallinity of aP/D/C-5 is higher than that of aP/T/B-5. It is attributed to the stronger self-assembly tendency of TB/DMF leading to its limited dispersion in the fiber matrix on one hand and, on the other hand, results from the stronger interaction of TB/DMF with PAN restricting the free migration and crystallization of polymer molecular chains.…”

Section: Acsmentioning

confidence: 96%

“…Specifically, the basic structural unit within ideal carbon-based fibers is the honeycomb hexagonal lattice plane made of sp 2 -hybridized carbon atoms, in which the network structure formed by carbon atoms interconnected through σ covalent bonds is the basis for the excellent fiber mechanical properties, while the conjugated system composed of delocalized π-bonds determines the superior electrical and thermal conductivity of fibers. ,, The honeycomb hexagonal lattice planes are stacked in layers to form a graphitic structure, which is further interconnected to form the final carbon-based fibers. However, in the actual production of either CFs or CNFs, hindered by the misalignment of molecular chains in their PAN precursor as well as the fiber structural defects introduced during spinning and heat treatments, the carbon-based fibers are still characterized by rather poor graphitic structures with unsatisfactory orientation, continuity, and compactness. , Therefore, there is a large gap between the performance of currently prepared carbon-based fibers and their theoretical predictions …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

In Situ Synthesis of Self-Assembly Supramolecular Crystal Seeds within Continuous Carbon Nanofibers for Improved Fiber Graphitic Structure

Zhang,

Zhu,

Zhao

et al. 2024

ACS Nano

Self Cite

View full text Add to dashboard Cite

The utilization of carbon-based fibers as a fundamental constituent holds strong appeal for diverse materials and devices. However, the poor fiber graphitic structure resulting from the heat treatment of atactic polyacrylonitrile (PAN) precursors often leads to a modest performance of carbon-based fibers. This paper takes electrospun carbon nanofibers (CNFs) as the research object and provides a seed-assisted graphitization strategy to improve the fiber graphitic structures. The typical melamine/cyanuric acid self-assembly precursor of graphitic carbon nitride is applied as supramolecular seeds in CNFs and demonstrates significant promotion of fiber graphitization, while it decomposes at elevated temperatures. Further studies show that the higher carbon content contributes to the better heat resistance of seeds; thus, nanoscale 2,6-diaminopyridine/cyanuric acid and 2,4,6-triaminopyrimidine/barbituric acid supramolecular seeds are developed. Both systems can be uniformly distributed in PAN precursors through in situ self-assembly and withstand high-temperature carbonization without severe pyrolysis. The dispersed seeds contribute to the formation of fibrillar PAN crystals and promote their conversion to ordered graphitic domains through nucleation and templating roles. The obtained CNFs exhibit increased crystallinity and graphitization degree with improved orientation and refined size of fiber crystals. As a result, the strength, modulus, and elongation at break of CNFs are comprehensively enhanced.

show abstract

Section: Resultssupporting

confidence: 59%

Section: Acsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 97%

Section: Acsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In Situ Synthesis of Self-Assembly Supramolecular Crystal Seeds within Continuous Carbon Nanofibers for Improved Fiber Graphitic Structure

Zhang,

Zhu,

Zhao

et al. 2024

ACS Nano

Self Cite

View full text Add to dashboard Cite

show abstract

Study on interfacial compatibilizing effect of PB grafts on PB/GNP thermally conductive composites

Yan,

Wen

2024

Polymer Composites

View full text Add to dashboard Cite

Using polymer‐grafts to improve the interfacial compatibilization of composites is by far the most common and effective strategy. However, although polybutene‐1 (PB) resin enjoys the reputation of “gold plastic” in the field of industry, there are few studies on its grafting and functional modification. In this work, PB‐grafts were prepared by melt grafting method with maleic anhydride (MAH) and styrene (St) as the functional monomers. The effect of two PB‐grafts (PB‐g‐MAH and PB‐g‐MAH‐co‐St) on the interfacial compatibilization of PB/GNP (Graphene nanosheet) thermally conductive composites was compared and the corresponding compatibilizing mechanism is discussed. Results indicate that PB‐g‐MAH‐co‐St has better compatibizing effect than that of PB‐g‐MAH because the cooperation of St with MAH enhanced the grafting degree of functional monomers on PB, and increased the surface energy of PB‐g‐MAH‐co‐St, which reduced the interface energy between PB and GNP and improved its interfacial adhesion. A better compatibilization effect has achieved when the compatibilizer and filler at the mass ratio of 1:4. Under this ratio, when the content of GNP is 30 wt%, the thermal conductivity and electrical conductivity of PB/GNP/ PB‐g‐MAH‐co‐St composite achieved 1.82 W·m−1·K−1 and 8.44 × 10−8 S·cm−1, which are 857.89% and 9 orders of magnitude higher than that of neat PB, respectively. Moreover, the composite has good mechanical properties and processability, which is beneficial to industrialization.Highlights PB‐g‐MAH‐co‐St has higher grafting ratio than that of PB‐g‐MAH. The surface energy of PB/GNP composites is reduced by use of PB‐g‐MAH‐co‐St. There is a suitable mass ratio between compatibilizer and filler. The composite of PB/GNP/PB‐g‐MAH‐co‐St achieved high thermal conductivity. The PB/GNP/PB‐g‐MAH‐co‐St composites have good melting processability.

show abstract

Understanding the behaviors of ZIF-67 reinforced electrospun carbon nanofibers in the preparation and stabilization

Gong,

Yang,

Song

et al. 2024

Composites Science and Technology

View full text Add to dashboard Cite

Hexagonal crystalline nanofillers reinforced composite carbon nanofibers with optimized crystal structure and improved mechanical properties

Cited by 6 publications

References 37 publications

In Situ Synthesis of Self-Assembly Supramolecular Crystal Seeds within Continuous Carbon Nanofibers for Improved Fiber Graphitic Structure

In Situ Synthesis of Self-Assembly Supramolecular Crystal Seeds within Continuous Carbon Nanofibers for Improved Fiber Graphitic Structure

Study on interfacial compatibilizing effect of PB grafts on PB/GNP thermally conductive composites

Understanding the behaviors of ZIF-67 reinforced electrospun carbon nanofibers in the preparation and stabilization

Contact Info

Product

Resources

About