Graphene Nanoplatelets as a Multifunctional Filler for Polymer Foams

Antunes, Marcelo; Gedler, Gabriel; Abbasi, Hooman; Velasco, José Ignácio

doi:10.1016/j.matpr.2016.02.039

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…Hence, it was possible to obtain foams with higher electrical conductivities with apparently lower volume fractions of conductive GnP (Figure b). The key factor was the combination of enhanced GnP dispersion by means of sonication, as previously demonstrated by the decrease of the peak height corresponding to the (002) crystal plane of GnP (see values in Table ), and reduction of the effective distance between conductive GnP stacks resulting from an increase in porosity, promoting the probability of electrical conduction by mechanisms such as tunneling .…”

Section: Resultsmentioning

confidence: 76%

Enhancing the electrical conductivity of polyetherimide‐based foams by simultaneously increasing the porosity and graphene nanoplatelets dispersion

2018

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Significant improvement in electrical conductivity of graphene nanoplatelets‐filled polyetherimide (PEI) foams was achieved by simultaneously increasing the porosity and graphene nanoplatelets dispersion. Foams were prepared by means of water vapor‐induced phase separation using a concentration of graphene nanoplatelets (GnP) between 1 and 10 wt%. To obtain two sets of foams having different density and porosity, PEI's concentration in N‐methyl pyrrolidone (NMP) solvent prior to foaming was set at 15 and 25–30 wt%, respectively. High‐power sonication was applied to GnP‐NMP suspension before PEI's addition for the foam series with higher porosity (15 wt% PEI). All foams were later characterized in terms of cellular structure, thermal stability, dynamic‐mechanical properties, and electrical conductivity. A notable enhancement in electrical conductivity was observed with foaming, especially when increasing the porosity and applying sonication, with foams reaching values as high as 1.7 × 10−1 S/m while maintaining the thermal stability and mechanical performance. POLYM. COMPOS., 40:E1416–E1425, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 76%

Enhancing the electrical conductivity of polyetherimide‐based foams by simultaneously increasing the porosity and graphene nanoplatelets dispersion

2018

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“…In addition, open-cell FMs are used as filters at many different levels, as water-repellent membranes that allow air to permeate whatever is underneath the membrane, or even as a hydrophobic barrier in some high-quality sporting and leisurewear [16,17,19]. PFs, especially polyurethane (PU) foams, are used in the sport, automotive, and medical industries to absorb energy, and to reduce sound/noise and vibrations [20,21].…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Aluminum Microfibers Reinforced Semi-Rigid Polyurethane Foams

2018

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Unreinforced and reinforced semi-rigid polyurethane (PU) foams were prepared and their compressive behavior was investigated. Aluminum microfibers (AMs) were added to the formulations to investigate their effect on mechanical properties and crush performances of closed-cell semi-rigid PU foams. Physical and mechanical properties of foams, including foam density, quasi-elastic gradient, compressive strength, densification strain, and energy absorption capability, were determined. The quasi-static compression tests were carried out at room temperature on cubic samples with a loading speed of 10 mm/min. Experimental results showed that the elastic properties and compressive strengths of reinforced semi-rigid PU foams were increased by addition of AMs into the foams. This increase in properties (61.81%-compressive strength and 71.29%-energy absorption) was obtained by adding up to 1.5% (of the foam liquid mass) aluminum microfibers. Above this upper limit of 1.5% AMs (e.g., 2% AMs), the compressive behavior changes and the energy absorption increases only by 12.68%; while the strength properties decreases by about 14.58% compared to unreinforced semi-rigid PU foam. The energy absorption performances of AMs reinforced semi-rigid PU foams were also found to be dependent on the percentage of microfiber in the same manner as the elastic and strength properties.

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“…More recently, a lot of attention has been given to polymer precursor formulations incorporating micro-or nano-scale fillers to improve heterogeneous nucleation, and to achieve optimal rheological properties such as extensional-strain-hardening for controlled cell growth. [6][7][8][9][10][11][12][13][14][15] The addition of micro-or nano-fillers to polymer foams is also widely investigated with the aim of retaining or improving the mechanical and functional properties of the resulting foams and achieving lightweight, strong, and multi-functional materials. [5][6][7][8][9][10][11][12][13][14][15][16] This review article provides a survey of recent literature on polymeric foams incorporating micro-and nano-scale fillers.…”

Section: Introductionmentioning

confidence: 99%

Polyolefinic nanocomposite foams: Review of microstructure-property relationships, applications, and processing considerations

Anish

Patham²,

Mohanty

et al. 2020

Journal of Cellular Plastics

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In this review, we survey the state of the art on polymeric foams incorporating nano-scale fillers. Particular focus of the review is on foams from polyolefinic nanocomposite formulations incorporating a wide variety of fillers. The nano-scale additives can influence the foam structure and properties in two ways: Firstly, they can act as composite reinforcement to enhance the mechanical properties and functionality of the matrix polymer; and secondly, they can act as foaming-processing aids through modification of the rheological, thermal and crystallization properties of the matrix as well as serving as heterogeneous nucleation sites. Through a combination of these influences, and using advanced processing techniques it is possible to achieve nanocomposite foams that have higher cell density, and more uniform cell size or controlled cell-size distribution. Such controlled foam morphologies, in turn, can yield better specific mechanical properties resulting in more effective light-weighting solutions. Further, the nano-scale additives can impart additional desired functionality resulting in multi-functional foams. In this article, we provide an overview of the mechanical, thermal and a few other relevant functional properties – such as piezoelectric sensitivity, acoustics, and filtration efficiency – of foams prepared using nanocomposite formulations, along with the processing considerations for achieving high quality foams using such materials.

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Graphene Nanoplatelets as a Multifunctional Filler for Polymer Foams

Cited by 16 publications

References 16 publications

Enhancing the electrical conductivity of polyetherimide‐based foams by simultaneously increasing the porosity and graphene nanoplatelets dispersion

Enhancing the electrical conductivity of polyetherimide‐based foams by simultaneously increasing the porosity and graphene nanoplatelets dispersion

Compressive Behavior of Aluminum Microfibers Reinforced Semi-Rigid Polyurethane Foams

Polyolefinic nanocomposite foams: Review of microstructure-property relationships, applications, and processing considerations

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