Poly (vinylidene fluoride) dielectric composites with both ionic nanoclusters and well dispersed graphene oxide

Guan, Jipeng; Xing, Chenyang; Wang, Yanyuan; Li, Yongjin; Li, Jingye

doi:10.1016/j.compscitech.2016.11.012

Cited by 75 publications

(35 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Maxwell–Wagner–Silas’s theory, heterogeneous accumulation of charge carriers on the interfaces of graphene and polymer layers contributed to the enhanced ε ′ recorded with addition of graphene. 34 It was noted that all composites showed sharp reduction in ε ′ with frequency, while neat PVDF exhibited slight decrease with frequency. This is due to the formation of high conductive grain boundaries in the polymer matrix with the addition of graphene at high frequency in favour of low ε ′.…”

Section: Resultsmentioning

confidence: 93%

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication

Uyor

Popoola

et al. 2018

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

Polymer/graphene nanocomposites (PGNs) have shown great potential as dielectric and energy storage materials. However, insolubility of graphene in most solvents, hydrophobic behaviour and poor dispersion in polymer matrix restrict wider fabrications and applications of PGNs. In this study, we present co-fabricated PGNs engineered by solution blending and melt compounding methods with improved dielectric performance. Further processing of PGNs by melt mixing after solution blending not only improved dispersion of graphene in the matrix but also ensured good interfacial interaction of the composites’ constituents and reduction of oxygen content in PGNs. Graphene nanoplatelets used in this study was slightly functionalized (fGNPs) to enhance dispersion in the polymer matrix. It was later characterized using Fourier transform infrared (FTIR) and Raman spectrometer. Scanning electron microscope (SEM) was used in morphological study of the fabricated composites. Dielectric properties, electrical conductivity, breakdown strength and energy storage capacity of the fabricated composites were investigated. The results obtained showed well-dispersed fGNPs in poly (vinylidene fluoride) (PVDF) matrix and improved dielectric performance. For instance, with 3.34 wt% and 6.67 wt% fGNPs co-fabricated composites, dielectric constant increased from about 9 for neat PVDF to 9930 and 38,418 at 100 Hz, respectively. While 7588 and 12,046 were respectively measured for solution blended-only composites at similar fGNPs content. These resulted to about 176.9% and 376.4% increase in energy storage density with 3.34 wt% and 6.67 wt% fGNPs co-fabricated composites when compared to their counterparts. These results were also credited to strong bonding, reduction of oxygen and recovered graphene structure by melt-mixing approach.

show abstract

Section: Resultsmentioning

confidence: 93%

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication

Uyor

Popoola

et al. 2018

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

show abstract

“…7 Zhang et al achieved 139% increase in tensile strength and 33% increase in Young's modulus for 1.0 wt % graphene-reinforced fluorographene-reinforced PI composite films. [11][12][13][14][15] Furthermore, many macromolecular chains, such as polybenzimidazole, 16 polyaniline, 17 poly(vinylidene fluoride) (PVDF), 18 polyethylenimine, 19 and polyurethane 20 can anchor on these functional groups. 9 Graphene is a robust two-dimensional (2D) layer structure consisting of a hexagonal single-atom-thick nanosheet network of sp 2 -hybridized carbon atoms.…”

Section: Introductionmentioning

confidence: 99%

“…As one derivative of graphene, GO nanosheets possess many oxygen-containing functional groups on its surface and edges, which can help to improve the dispersibility of graphene considerably. [11][12][13][14][15] Furthermore, many macromolecular chains, such as polybenzimidazole, 16 polyaniline, 17 poly(vinylidene fluoride) (PVDF), 18 polyethylenimine, 19 and polyurethane 20 can anchor on these functional groups. Percec et al obtained polypyrrole/GO hybrid composites by using ammonium persulfate as an oxidant.…”

Section: Introductionmentioning

confidence: 99%

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

Yuan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Graphene oxide (GO) can improve the mechanical property of polymer matrix greatly. However, its poor dispersibility may considerably lower reinforcing efficiency. To address this problem, the environment-friendly polyaspartic acid (PASP) was adopted to modify GO through two generally modified methods: hydrogen bond adsorption and chemical graft modification. Findings indicate that the covalent bond grafted PASP-GO exhibits better dispersibility than the product by noncovalent method (PASP/GO-noncovalent). For chemically grafted PASP-GO, the nearly spherical polymer nanoparticles are formed on the GO nanosheets through self-polymerization, and its size can be well manipulated by adjusting the dosage of PASP so as to yield PASP-GO-1/4, PASP-GO-1/2, and PASP-GO-1/1 (mass ratio: m PASP /m GO = 1/4, 1/2, and 1/1); the corresponding diameters of these polymer aggregates are 56.4 AE 7.1, 90.1 AE 12.6, and 151.2 AE 16.1 nm. They are further utilized to reinforce polyimide matrix. Compared with the PASP-GO-1/2 and PASP-GO-1/1, the smaller PASP-GO-1/4 has better strengthening effect, due to its high specific surface area and dense distribution. This desirable fabrication of GO-based nanofillers provides a new avenue on the development of polymer matrix with comprehensive performances.

show abstract

“…These materials combine the advantages of fillers, such as high dielectric constant and good electrical conductivity, as well as the merits of polymers, such as proper processing, flexibility, mechanical properties, and high breakdown strength. Recently, the incorporation of conductive fillers such as carbon black (CB), carbon nanotubes (CNTs) and graphene into polymer matrix has been considered as an effective strategy for fabricating polymer nanocomposites with high dielectric constants based on the percolation effect. Among the various conductive fillers, multiwalled carbon nanotubes (MWCNTs) have great potential for realizing flexible high‐k nanocomposites due to their superior conductivity, large aspect ratio, and excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Integration of PDA Chemistry and Surface‐Initiated ATRP to Prepare Poly(methyl methacrylate)‐Grafted Carbon Nanotubes and Its Effect on Poly(vinylidene fluoride)–Carbon Nanotube Composite Properties

Song

Xia

Wei

et al. 2019

Macro Materials & Eng

View full text Add to dashboard Cite

NanocompositesPoly(methyl methacrylate)-grafted carbon nanotubes (PMMA@MWCNTs) are nondestructively prepared via the integration of mussel-inspired polydopamine (PDA) chemistry and the surface-initiated atom transfer radical poly merization (ATRP) method. The structures and properties of the poly(vinylidene fluoride)-based (PVDF-based) nanocomposites filled with pristine MWCNTs and PMMA@MWCNTs are investigated. The results show that the encapsulation of PMMA on the MWCNTs surface not only improves the dispersibility of MWCNTs in the PVDF matrix but also enhances the interfacial interaction between MWCNTs and PVDF. The addition of PMMA@MWCNTs nanofillers to PVDF can effectively induce the crystal structure of PVDF to transform from the α-phase to the β/γ -phase, and nearly 100% β/γ -phase PVDF formed when the nanofiller loading is higher than 5 wt%. Compared with the MWCNTs/PVDF composites, the PMMA@MWCNTs/PVDF composites exhibit obvious improvement in the percolation threshold because the PMMA shells hinder the direct contact of the MWCNTs. Moreover, the loss tangent of the PMMA@MWCNTs/PVDF composites is effectively suppressed due to the reduced leakage current in the composites and the enhanced interfacial strength between the nanofiller and the matrix.

show abstract

Poly (vinylidene fluoride) dielectric composites with both ionic nanoclusters and well dispersed graphene oxide

Cited by 75 publications

References 34 publications

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

Integration of PDA Chemistry and Surface‐Initiated ATRP to Prepare Poly(methyl methacrylate)‐Grafted Carbon Nanotubes and Its Effect on Poly(vinylidene fluoride)–Carbon Nanotube Composite Properties

Contact Info

Product

Resources

About