Advanced bimodal polystyrene/multi-walled carbon nanotube nanocomposite foams for thermal insulation

Gong, Pengjian; Wang, Guilong; Tran, Minh-Phuong; Buahom, Piyapong; Zhai, Shuo; Li, Guangxian

doi:10.1016/j.carbon.2017.05.029

Cited by 126 publications

(76 citation statements)

References 40 publications

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“…The experimental thermo-physical properties are presented in table 1. These values are close to that founded in the literature [7], [8], [9].…”

Section: Density and Specific Heatsupporting

confidence: 91%

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Experimental and numerical investigations on the thermal performance of hemp such a bio-sourced insulation material: application to a Moroccan Mediterranean climate

Dlimi¹,

Iken²,

Agounoun³

et al. 2018

IJET

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Thermal performance of hemp concrete and hemp wool such as ecological insulation was evaluated for the city of Meknes in Morocco, in comparison with polystyrene which is an organic insulation material. The study was done in three sections. First, a thermo-physical properties characterization was done using the EI700 device. Then, the study was done on a concrete wall subjected to periodic outdoor conditions. The three insulation materials are used and the effects of thickness, location and partitioning on the time lag and decrement factor were investigated. Finally, heating and cooling loads of a whole building with the use of six different walls configurations are calculated using TRNSYS software. Throughout the whole study, results show that hemp wool presented the best thermal performance, and the evaluation of its use such us an insulation material in Morocco and especially in Meknes was investigated.

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“…The experimental thermo-physical properties are presented in table 1. These values are close to that founded in the literature [7], [8], [9].…”

Section: Density and Specific Heatsupporting

confidence: 91%

“…The heat transfer in the wall is assumed to be one-dimensional. The transient heat conduction problem expressed by Equation (8) has been solved by using an implicit finite difference scheme for a multilayer wall [13], [14].…”

Section: Governing Equation and Boundary Conditionsmentioning

confidence: 99%

Experimental and numerical investigations on the thermal performance of hemp such a bio-sourced insulation material: application to a Moroccan Mediterranean climate

Dlimi¹,

Iken²,

Agounoun³

et al. 2018

IJET

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“…A large number of interfaces between PMMA and MWCNT are generated when the MWCNTs are sparsely dispersed in the PMMA. The phonons that are regarded as the major media of thermal conduction are mismatched at the interfaces, leading to strong phonon scattering and consequently decreased thermal conductivity of nanocomposites …”

Section: Resultsmentioning

confidence: 99%

“…In other words, the decrease in total thermal conductivity of PMMA/MWCNT foams is attributed to the significant decrease in thermal radiation. Thanks to MWCNT's strong absorption of infrared radiation, our original intention of blocking radiation by adding MWCNTs into PMMA is achieved. Figure d plots the thermal conductivity of nanocomposite foams with various MWCNT contents as a function of expansion ratio.…”

Section: Resultsmentioning

confidence: 99%

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO₂ Foaming

Zhao

Wang

et al. 2019

Macro Materials & Eng

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Poly(methyl methacrylate) (PMMA) foams exhibit many advantages over the most popular polystyrene (PS) foams, which make them an ideal candidate for thermal insulation application. First, PMMA has lower carbon content, lower burning rate, smaller heat release rate, and lower smoke emission than PS. [7] So, PMMA foams need less flame retardants than PS foams when used as construction thermal insulation materials, which helps reduce the overall production costs and mitigate the greenhouse effect. Second, PMMA can strongly absorb infrared light in the wavelength range of 2.8-25 µm, [8] while PS can hardly absorb infrared light. Thus, the low-density PMMA foams are expected to block more thermal radiations than the PS foams with the same density. Third, PMMA has higher CO 2 solubility than PS because the carbonyl group in PMMA has stronger adsorption capacity for CO 2 than the benzene ring in PS. [9] The higher CO 2 solubility makes it much easier to prepare low-density PMMA foam, enhancing foam's thermal insulation. Carbon nanotubes (CNTs) with unique electrical, mechanical, and thermal properties have exhibited great value in designing electrical conductive composites, [10,11] electromagnetic interference shielding, [12,13] and energy harvesting materials. [14] These excellent properties of CNTs also make them ideal fillers to design polymer foams for some important reasons. First, CNTs are excellent heterogeneous nucleating agent to increase the cell density. Cell nucleation is more likely to occur at the interfaces between fillers and polymer matrix because of the relatively low free energy barrier for heterogeneous nucleation. [15][16][17] Due to their high aspect ratio and specific area, uniformly dispersed CNTs can offer much more interfaces as the heterogeneous nucleation sites than many other spherical (i.e., nano SiO 2 [18] ) or lamellar fillers (i.e., nano clay [19] ). Moreover, CNTs can endow the polymer foams with multifunctionality by offering the same advantages that they offer in the bulk while not decreasing foam's other properties. For example, CNTs are one kind of good wave-absorbing material that can be recognized as black bodies. In electromagnetic fields, CNTs can attenuate electromagnetic radiation by forming a conductive network (conductivity loss), [12,20] or by the polarization of CNT/polymer interfaces (dielectric loss), [21,22] or by scattering and multiple Polymer Nanocomposite Foaming behavior of poly(methyl methacrylate) (PMMA)/multi-walled carbon nanotubes (MWCNTs) nanocomposites and thermally-insulating, electrical, and mechanical properties of the nanocomposite foams are investigated. PMMA/MWCNT nanocomposites containing various amounts of MWCNTs are first prepared by combining solution and melt blending methods, and then foamed using CO 2 . The foaming temperature and MWCNT content are varied for regulating the structure of PMMA/MWCNT nanocomposite foams. The electrical conductivity measurement results show that MWCNTs have little effect on the electrical conductivity of foams with l...

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“…Recently, faced with global energy crisis and environmental pollution, both industries and academics have made efforts to manufacture new‐generation lightweight products by using less raw material and consuming less energy . Conventional foam injection molding (CFIM) technology is achieved by injecting the mixture of polymer melt and supercritical fluid (SCF) into a closed mold cavity with a short‐shot, and the expandable melt/gas mixture generates a foam structure under low pressure . However, it is known that the differences of shearing stress and temperature in both the direction of the flow and the direction perpendicular to the flow usually result in a nonuniform cell structure, which deteriorates the mechanical properties of the foamed products .…”

Section: Introductionmentioning

confidence: 99%

Polystyrene Foam with High Cell Density and Small Cell Size by Compression‐Injection Molding and Core Back Foaming Technique: Evolution of Cells in Cavity

Bai

Dong

Xiao

et al. 2018

Macro Materials & Eng

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Many efforts have been made to obtain uniform cell structures from foam injection molding techniques. However, cell nucleation mechanism and complex dynamics during the cell formation have rarely been well understood. Here, high‐pressure foam injection molding (HPFIM) is achieved by combining the injection–compression molding with core back foaming (ICMCBF) technique. The influences of compression pressure and time on the cell structure of polystyrene foam during the foaming process are studied. Compared with low pressure for conventional foam injection molding, high compression pressure (200 bar) and fast pressure drop rate of ICMCBF endow the foam with the highest cell density (1.59 × 107 cells cm−3), and the smallest cell size (15 µm). The tensile strength and impact strength are enhanced by about 60% (from 22.3 to 35.6 MPa) and 80% (from 3.6 to 6.8 MPa), respectively. This study gives a critical understanding of the cell nucleation and growth mechanism of the foam injection molding and supplies a new strategy for the fabrication of foam with uniform cell structure.

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Advanced bimodal polystyrene/multi-walled carbon nanotube nanocomposite foams for thermal insulation

Cited by 126 publications

References 40 publications

Experimental and numerical investigations on the thermal performance of hemp such a bio-sourced insulation material: application to a Moroccan Mediterranean climate

Experimental and numerical investigations on the thermal performance of hemp such a bio-sourced insulation material: application to a Moroccan Mediterranean climate

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO₂ Foaming

Polystyrene Foam with High Cell Density and Small Cell Size by Compression‐Injection Molding and Core Back Foaming Technique: Evolution of Cells in Cavity

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Advanced bimodal polystyrene/multi-walled carbon nanotube nanocomposite foams for thermal insulation

Cited by 126 publications

References 40 publications

Experimental and numerical investigations on the thermal performance of hemp such a bio-sourced insulation material: application to a Moroccan Mediterranean climate

Experimental and numerical investigations on the thermal performance of hemp such a bio-sourced insulation material: application to a Moroccan Mediterranean climate

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO2 Foaming

Polystyrene Foam with High Cell Density and Small Cell Size by Compression‐Injection Molding and Core Back Foaming Technique: Evolution of Cells in Cavity

Contact Info

Product

Resources

About

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO₂ Foaming