Preparation of microcellular polystyrene/polyethylene alloy foams by supercritical CO2 foaming and analysis by X-ray microtomography

Xing, Zhe; Wang, Mouhua; Du, Guohao; Xiao, Tiqiao; Liu, Weihua; Dou, Qiang; Wang, Guozhong

doi:10.1016/j.supflu.2013.06.003

Cited by 38 publications

(21 citation statements)

References 34 publications

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“…19,20 Intensive studies have discussed the effects of polymer chemistry and processing parameters on the cell morphologies and mechanical properties of microcellular foams. [21][22][23][24][25] However, relatively little research work has been done to explore the relationship between the foam morphology and the physical properties of the microcellular foams. Sun et al 26 reported that the relative density has a significant influence on the strength and Young's modulus in both tension and compression tests for microcellular polyethersulfone (PESF) and polyphenylsulfone (PPSF) foams.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Zhang

Yang

et al. 2014

Journal of Cellular Plastics

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This article reports on the compressive, dynamic mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions fabricated using the environment-friendly supercritical carbon dioxide. The effects of cell morphologies such as relative density, cell-size distribution and porosity on the compressive strength, Young's modulus, storage modulus, loss modulus, dielectric constant and loss tangent of the microcellular polycarbonate foams are investigated quantitatively. Experimental values of the compressive strength and Young's modulus fit very well with the theoretical values calculated from the Gibson-Ashby model at low relative densities. The higher relative density leads to higher storage modulus and loss modulus. The bimodal foams significantly improve the compressive and dynamic mechanical properties compared to the unimodal foams with the same relative density. The dielectric properties of microcellular foams depend only on the total porosity, but not on the cell-size distribution or microstructure of the foams. With increasing porosity, the dielectric constant of the microcellular foams gradually decreases, and agrees very well with the curve calculated from the Maxwell-Garnett-spheres model.

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Section: Introductionmentioning

confidence: 99%

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Zhang

Yang

et al. 2014

Journal of Cellular Plastics

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“…Supercritical carbon dioxide is an ideal and clean blowing agent, because CO 2 is chemically stable and nontoxic. Additionally, it has a mild critical temperature (31 ∘ C), moderate critical pressure (7.38 MPa), and a relatively high solubility in polymers [29].…”

Section: Fabrication Of Porous Polymersmentioning

confidence: 99%

From Plastic to Silicone: The Novelties in Porous Polymer Fabrications

Berro

Ahdab

Hassan

et al. 2015

Journal of Nanomaterials

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Porous polymers are gaining increased interest in several areas due, in great part, to their large surface area and unique physiochemical properties. Porous polymers are conventionally manufactured using specific processes related to the chemical structure of each polymer. With the wide variety of porous polymers that have been designed, fabricated, and tested to date, this review aims to provide an overview of the advances and recent progress in the preparation processes and fabrication techniques. A detailed comparison between these techniques is also provided. Some of these techniques offer the advantage of controlling the porosity and the possibility to obtain porous 3D polymers. A new generic fabrication process that can be applied to all liquid polymers to texture their outer surfaces with a desired porosity is also presented. The proposed process, which is based on two micromolding steps, offers flexibility in terms of tailoring the texture of the final polymer by simply using porous silicon templates with different pore sizes and configurations. The anticipated process was successfully implemented to texture polyethyl hydrosiloxane (PMHS) using porous silicon and polymethyl methacrylate (PMMA) scaffolds.

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“…Polyethylene, poly (propylene), polystyrene, poly (vinyl chloride), and poly (ethylene terephthalate) have revolutionized and played an essential role in the packaging and insulation industries in a variety of forms such as films, flexible bags, rigid containers, and foam capsules . Being convenient and easily produced, these petroleum‐derived foams play an essential role as packaging and insulation materials commonly used in daily life . However, they are not biodegradable or derived from renewable resources, which can lead to growing problems of pollution and shortage of petroleum resources .…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent

Peng

Runt

et al. 2018

Polymers for Advanced Techs

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Supercritical carbon dioxide (scCO2) processed thermoplastic starch (scCO2aTPS), cellulose nanofiber (CNF) modified scCO2aTPS (scCO2aTPS100CNF0.02) and glutaraldehyde (GA) modified scCO2aTPS100CNF0.02 (scCO2aTPS100CNF0.02GAx) foams were prepared for the first time using scCO2 as a blowing agent during their foaming processes. The expansion ratio, cell density, moisture resistance, and compressive strength (σc) retention properties of each foam series were considerably improved with increasing scCO2 pressure during the foaming processes. The expansion ratios and cell densities of each scCO2aTPS100CNF0.02GAx foam series were increased considerably to a maximum value, as the GA content approached an optimum value. The optimal scCO211TPS100CNF0.02GA1.6 foam material exhibited a high expansion ratio and cell density at approximately 50 and approximately 8 × 108 cells/cm3, respectively. Compared with corresponding aged scCO2aTPS and scCO2aTPS100CNF0.02 foam specimens, considerably better moisture resistance and σc retention properties were observed for scCO2aTPS100CNF0.02GAx foam specimens, when they were modified with the corresponding optimum GA content. The moisture resistance and σc retention for optimal prepared scCO27TPS100CNF0.02GA0.4, scCO29TPS100CNF0.02GA0.8 and scCO211TPS100CNF0.02GA1.6 foam materials improved further with increasing scCO2 pressure. Possible reasons accounting for the highly expansion ratio, moisture resistance, and σc retention properties for scCO2aTPS100CNF0.02GAx foams are presented.

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Preparation of microcellular polystyrene/polyethylene alloy foams by supercritical CO2 foaming and analysis by X-ray microtomography

Cited by 38 publications

References 34 publications

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

From Plastic to Silicone: The Novelties in Porous Polymer Fabrications

Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent

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