Dielectric properties of reduced graphene oxide/polypropylene composites with ultralow percolation threshold

Wang, Dongrui; Xiaoman, Zhang; Zha, Jun‐Wei; Zhao, Jun; Dang, Zhi‐Min; Hu, Guohua

doi:10.1016/j.polymer.2013.02.012

Cited by 217 publications

(142 citation statements)

References 39 publications

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“…However, there is no generally accepted definition of the term "latex technology". Some confusion about the meaning of this term has ensued with surfactant-free systems also being considered [29, [71][72][73]. To avoid arbitrary distinctions with other latex-based methods [29,53,71], the term "latex technology"…”

Section: Surfactant and Latex Technologymentioning

confidence: 99%

Graphene-philic surfactants for nanocomposites in latex technology

Mohamed

Ardyani

Bakar

et al. 2016

Advances in Colloid and Interface Science

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Graphene is the newest member of the carbon family, and has revolutionized materials science especially in the field of polymer nanocomposites. However, agglomeration and uniform dispersion remains an Achilles" heel (even an elephant in the room), hampering the optimization of this material for practical applications. Chemical functionalization of graphene can overcome these hurdles but is often rather disruptive to the extended piconjugation, altering the desired physical and electronic properties. Employing surfactants as stabilizing agents in latex technology circumvents the need for chemical modification allowing for the formation of nanocomposites with retained graphene properties. This article reviews the recent progress in the use of surfactants and polymers to prepare graphene/polymer nanocomposites via latex technology. Of special interest here are surfactant structure-performance relationships, as well as background on the roles surfactantgraphene interactions for promoting stabilization.

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Section: Surfactant and Latex Technologymentioning

confidence: 99%

Graphene-philic surfactants for nanocomposites in latex technology

Mohamed

Ardyani

Bakar

et al. 2016

Advances in Colloid and Interface Science

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“…Polymer composites have recently become the most widely researched topic in scientific and commercial studies because of their potential for enhancing properties compared with neat polymers [1][2][3]. Carbon nanotubes and carbon nanofiber are carbon-based materials that have recently become the focus of research in the field of nanotechnology.…”

Section: Introductionmentioning

confidence: 99%

“…However, graphene has also become one of the most widely researched materials in recent years. Most polymer-based composite materials include graphene as a replacement for other nanomaterials to provide reinforcement [1][2][3][4][5]. Because the numerous theoretical mechanical properties of graphene are useful, several reports have indicated that the effect of reinforced polymer-based composite materials comprising graphene is more beneficial than that of graphite.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of graphene nanosheets/polypropylene composites

Hsu¹,

Chen²,

Tsai³

2015

AIP Conference Proceedings

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Abstract. In this study, the effect of the various solid contents of graphene nanosheets (GNSs) on the mechanical properties (tensile, flexural and impact strength) of nanosheets and polypropylene (PP) composites formed by injection molding was determined. The material was used with graphene microencapsulated PP pellets. The experimental results indicated that the GNS/PP composites had a maximal tensile strength of 29.54 MPa when the solid GNS content was 0.2 wt%, which increased 8.24 % compared with that of the neat PP matrix. The flexural strength of the GNS/PP composites achieved a maximal value of 25.47 MPa when the solid GNS content was 0.4 wt%, which increased 22.09 % compared with that of the neat PP matrix. In determining the impact energy, the GNS/PP composites exhibited a maximal value of 861.39 J/m when the solid GNS content was 0.2 wt%, which increased 33.95 % compared with that of the neat PP matrix.

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“…An alternative to prepare nanoscale dispersed graphene/PP composites via in-situ Ziegler-Natta polymerization in the presence of graphene supported catalyst has been reported [38], but its industrial application is limited by the requirement of sophisticated polymerization techniques. The graphene/PP composites with good filler dispersion can also be prepared through a solution mixing manner [39][40][41]. In most studies, PPgMA was used either as the matrix polymer [24,42] or as the compatibilizer for PP/functionalized graphite oxide (fGO) nanocomposites [39,41].…”

mentioning

confidence: 99%

Role of surfactant molecular weight on morphology and properties of functionalized graphite oxide filled polypropylene nanocomposites

Wang

Jc²,

Sz³

2014

Express Polym. Lett.

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Conductive polymer composites have aroused wide interests from both academia and industry in the field of functional materials. Addition of diverse conducting fillers such as carbon black [1,2], graphite [3], and metal fiber or powder [4] into thermoplastic polymers through melt mixing is an effective approach to fabricate conductive composites. Because a great amount of the fillers, generally greater than 15 wt% [5], were required for the host polymer to become conductive, resulting in both poor processability and inferior mechanical properties, the practical applications of these conventional composites were largely restricted. On the other hand, commercial exploitation of isotactic polypropylene has been expanded rapidly due to its attractive characters of low cost, low weight, heat distortion above 100°C, and extraordinary versatility in terms of properties, applications and recycling. The introduction of nanoscopic fillers of high anisotropy enhances a wide range of performance of the polypropylene nanocomposites, such as mechanical, thermal and conductive properties, at a relatively small loading [6]. Graphite is a layered mineral composed of weakly bonded graphene sheets with a large aspect ratio. Abstract. Various surfactants of different molecular weights, including alkylamine, poly(oxypropylene) diamine (POP), and maleic anhydride grafted polypropylene (PPgMA) oligomers, were used for simultaneous funtionalization and reduction of graphite oxide (fGO). In this study, the effect of molecular weight and compatibility of the surfactants on the morphology and properties of the nanocomposites are reported. Wide-angle X-ray diffraction (WAXD) exhibited a definite interlayer thickness for GOA (alkylamine intercalated GO), however, the diffraction peaks were nearly suppressed for fGOs combining ODA with either POP (GOAP) or PPgMA (GOAE). The uniform dispersion of the fGO flakes in the polypropylene matrix resulted in the significant increase in both the degradation temperature and the crystallization temperature. A single characteristic melting peak of monoclinic (!) crystalline phase was observed from DSC traces, which was consistent with WAXD results. Dynamic mechanical analysis clearly indicated increase in both the storage modulus and the glass transition temperature of the nanocomposites due to the enhanced affinity between fGO and the polypropylene matrix. However, GOAP composite showed lower E" and T g than GOAE because POP is less compatible with the matrix than PPgMA oligomer. Dielectric analysis also showed significant increase in both dielectric permittivity and dielectric loss at low frequency regimes with GOAE showing maximum dielectric properties. The finely dispersed GOAE and its compatibility with polymer matrix manifested the interfacial polarization, which gave rise to much greater #" and #$ than other nanocomposites.

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Dielectric properties of reduced graphene oxide/polypropylene composites with ultralow percolation threshold

Cited by 217 publications

References 39 publications

Graphene-philic surfactants for nanocomposites in latex technology

Graphene-philic surfactants for nanocomposites in latex technology

Mechanical properties of graphene nanosheets/polypropylene composites

Role of surfactant molecular weight on morphology and properties of functionalized graphite oxide filled polypropylene nanocomposites

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