Microwave-assisted foaming and sintering to prepare lightweight high-strength polystyrene/carbon nanotube composite foams with an ultralow percolation threshold

Xie, Yeping; Li, Zhao; Tang, Jiahong; Pan, Li; Chen, Wenhua; Li, Li; Zheng, Zhuo

doi:10.1039/d1tc01923f

Cited by 33 publications

(19 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even though the filler content reaches up to 10.0 wt%, the PNGL 0.6 10.0%/PS still maintains the electrical resistivity with the corresponding ρ v of 3.63 × 10 9 Ω·m. Basically, the reason for the high volume resistivity is mainly ascribed to the inadequate formation of interconnected networks by GNPG, which can be confirmed in Figure 5c 27,49 . In Figure 7b, when the circular sheet is connected in a sample circuit with LED, the LED is not bright.…”

Section: Resultsmentioning

confidence: 80%

Graphene nanosheet stabilized Pickering emulsion and its polystyrene nanocomposites

Wang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

High thermal conductivity and electrical insulation materials are necessary for packaging materials of miniaturized electronic equipment at present. Graphene nanosheets (GNs) have great potential in polymer composites due to its excellent thermal conductivity. However, the ultra‐high conductivity of GNs will reduce the insulation of polymer composites, so that the GN composites have good thermal conductivity and electrical insulation has become the focus of research. Herein, the closed cell polystyrene nanocomposites are polymerized by using a Pickering emulsion route. Based on the exfoliating effect of pristine graphite at the oil–water interface and the amphiphilic properties of GNs during the preparation of emulsion, the resulting graphite can achieve good dispersion in the polystyrene resin. Furthermore, the high heat transfer rate of the resulting graphite makes the temperature of polystyrene resin increase by 60.2°C at room temperature within 1 min. Meanwhile, the high volume electrical resistivity (3.63 × 109 Ω·m) and breakdown strength (33.8 kV·mm−1) confirms the PNGL0.610%/PS composite keep excellent electrical insulation at 10.0 wt% filler loading.

show abstract

Section: Resultsmentioning

confidence: 80%

Graphene nanosheet stabilized Pickering emulsion and its polystyrene nanocomposites

Wang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Apart from flame retardancy, some other functionalities such as electrical conductivity, EMI shielding [121][122][123] and piezoresistive properties 124 are research areas for bead foams. The literature given here provides a reference.…”

Section: Metal Hydroxides As Flame Retardantsmentioning

confidence: 99%

Progress in the development of bead foams – A review

Kuhnigk

Standau

Dörr

et al. 2022

Journal of Cellular Plastics

View full text Add to dashboard Cite

For a long time, the number of available bead foam variants limited to standard polymers which restricted their functionality mainly to packaging, thermal insulation (e.g. in construction) and shock absorption (e.g. in transportation). In particular, standard polymers such as expanded polystyrene, expanded polyethylene and expanded polypropylene were used for components requiring good insulating properties and high energy absorption at low cost. Mainly since the last two decades, new polymer variants have found their way into the world of bead foams and are currently adding further functionalities, such as sustainability, flame retardancy, increased thermal stability and enhanced mechanical performance (e.g. improvements in energy absorption and impact resistance). Versatile fields of application open up, revolutionizing both industry and design sectors. This review article emphasizes the special development progress of new bead foam variants and their processing technologies. Upcoming opportunities of digital methods for modelling and simulation are highlighted.

show abstract

“…One-dimensional (1D) carbon nanotubes (CNTs) with ultrahigh electrical conductivity are often added to a polymer matrix as carbon conductive particles, − because they are easier to contact with each other to form a network structure, which gives the materials excellent dielectric, conductive, and EM-absorbing properties at a relatively low nanofiller content. − When introducing cells into the nanocomposite, a cellular structure with continuous cell walls separated by air will be formed, and the additives will then be selectively located in the polymer matrix (that is, cell walls isolated by cells). − Therefore, a lower CNT volume content is enough to construct the dielectric response network, conductive network, or EM-absorbing network, compared with bulk materials. − Furthermore, the incorporation of air in nanocomposites decreases the impedance mismatch at the nanocomposite/air interface − and, hence, significantly decreases EM wave reflection. Meanwhile, the introduction of cells in the nanocomposite endows materials with shock absorption, noise reduction, heat insulation, etc. − …”

Section: Introductionmentioning

confidence: 99%

Optimization of Electrical, Dielectric, and Electromagnetic Response in Nanocomposite Foam by Balancing Carbon Nanotube Restricted Orientation and Selective Distribution

Jin

Zhang

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In nanocomposite foams, one-dimensional (1D) carbon nanotubes (CNTs) with large length-to-diameter (L/D) ratios are selectively distributed in two-dimensional (2D) cell walls, featured as restricted distribution state of limiting in the cell-wall thickness direction and orienting in the cell-wall stretching direction. Such a unique CNT distribution state in nanocomposite foam significantly affects the degree of interface polarization for CNTs, conductive network construction, and electromagnetic (EM) wave interaction, hence determining the dielectric, conductive, and EM absorbing performance of the foams. Based on experiment and simulation results, the underlying synergistic interaction between CNTs and cells in nanocomposite foam is uncovered: (1) CNTs selectively distributed in polymer matrix isolated by cells (that is, the cell wall), and, hence, better dielectric, conductive, and EM absorbing performance were obtained at lower CNT volume content; (2) the 1D structure of CNTs is favorable for contacting with each other, but also leads to restricted orientation in the 2D cell walls (hence, there is an optimum CNT distribution in nanocomposite foam to optimize the corresponding performance). It was observed that larger CNT L/D ratios, easier to construct response networks, but larger CNTs restrict the degree to which the corresponding network construction is suppressed in cell walls. This optimum L/D ratio shifts to lower values as the CNT volume content in nanocomposite foam increases. Therefore, an appropriate cellular structure, CNT L/D ratio, and volume content are the prerequisites to maximize the advantages of CNT selective distribution and an easy-to-contact 1D structure, and to minimize the disadvantage of cell-wall-restricted CNT distribution, to construct optimum dielectric, conductive, and EM-absorbing networks for better corresponding performance.

show abstract

Microwave-assisted foaming and sintering to prepare lightweight high-strength polystyrene/carbon nanotube composite foams with an ultralow percolation threshold

Abstract: Lightweight, high-strength, and multifunctional polymer composite foams are urgently needed in various high-tech areas. Herein, we proposed a facile, clean, and energy-saving strategy to prepare the microcellular polystyrene/carbon nanotubes (PS/CNTs)...

Cited by 33 publications

References 55 publications

Graphene nanosheet stabilized Pickering emulsion and its polystyrene nanocomposites

Graphene nanosheet stabilized Pickering emulsion and its polystyrene nanocomposites

Progress in the development of bead foams – A review

Optimization of Electrical, Dielectric, and Electromagnetic Response in Nanocomposite Foam by Balancing Carbon Nanotube Restricted Orientation and Selective Distribution

Contact Info

Product

Resources

About