Thermal conductivity anisotropy in polypropylene foams prepared by supercritical CO2 dissolution

Antunes, Marcelo; Realinho, Vera; Velasco, José Ignácio; Solórzano, E.; Rodríguez‐Pérez, M. A.; Saja, J.A. de

doi:10.1016/j.matchemphys.2012.07.001

Cited by 28 publications

(14 citation statements)

References 30 publications

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“…Due to its very advantageous price and excellent mechanical properties, the foaming of PP with supercritical CO 2 has been widely studied; however, good foaming can only be achieved using PP with the appropriate degree of crystallinity and melt strength . To select an appropriate polymer matrix, the foaming of two different PPs, differing in their crystallinity degree ( χ ) and melting temperature ( T m ), was realized and compared (Figure ; PP1 with T m = 165 °C and χ = 42.6%; PP2 with T m = 137 °C and χ = 18.3%).…”

Section: Resultsmentioning

confidence: 99%

Nanocomposite Foams of Polypropylene and Carbon Nanotubes: Preparation, Characterization, and Evaluation of their Performance as EMI Absorbers

Tran

Thomassin

Alexandre

et al. 2015

Macro Chemistry & Physics

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Highly expanded nanocomposite foams of polypropylene and carbon nanotubes (PP/CNT) are formed using supercritical carbon dioxide (scCO 2 ) technology. The foaming parameters (temperature, pressure) are investigated to establish their infl uence on the morphology of the resulting foams and their impact on the electrical conductivity. As promising electromagnetic-interference (EMI) absorbers, the EMI shielding performance of the foams is determined, and a preliminary relationship is established between foam morphology and the EMI shielding performance. The best candidates are highly expanded foams with a volume expansion of >25, containing 0.1 vol% CNTs; they are able to absorb more than 90% of the incident radiation between 25 and 40 GHz.

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Section: Resultsmentioning

confidence: 99%

Nanocomposite Foams of Polypropylene and Carbon Nanotubes: Preparation, Characterization, and Evaluation of their Performance as EMI Absorbers

Tran

Thomassin

Alexandre

et al. 2015

Macro Chemistry & Physics

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“…Figure 3b shows that the apparent thermal conductivity in the axial direction (along the pores) is significantly higher than in the radial direction. This strong orientation effect is clearly a consequence of the anisotropic pore and wall structure and related to a combination of orientation-dependent radiation 29 and solid conduction in the walls as well as possibly natural convection in the axial direction 32 . Thermographic recordings (Fig.…”

Section: Thermal Transport Propertiesmentioning

confidence: 99%

Thermally insulating and fire-retardant lightweight anisotropic foams based on nanocellulose and graphene oxide

et al. 2014

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High-performance thermally insulating materials from renewable resources are needed to improve the energy efficiency of buildings. Traditional fossil-fuel-derived insulation materials such as expanded polystyrene and polyurethane have thermal conductivities that are too high for retrofitting or for building new, surface-efficient passive houses. Tailored materials such as aerogels and vacuum insulating panels are fragile and susceptible to perforation. Here, we show that freeze-casting suspensions of cellulose nanofibres, graphene oxide and sepiolite nanorods produces super-insulating, fire-retardant and strong anisotropic foams that perform better than traditional polymer-based insulating materials. The foams are ultralight, show excellent combustion resistance and exhibit a thermal conductivity of 15 mW m(-1) K(-1), which is about half that of expanded polystyrene. At 30 °C and 85% relative humidity, the foams retained more than half of their initial strength. Our results show that nanoscale engineering is a promising strategy for producing foams with excellent properties using cellulose and other renewable nanosized fibrous materials.

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“…Thermal conductivity measurements were performed through the transient plane source technique described elsewhere [52][53][54][55][56].…”

Section: Thermal Conductivitymentioning

confidence: 99%

Mechanical and thermal performance of concrete and mortar cellular materials containing plastic waste

Ruiz‐Herrero

Nieto

Lopez‐Gil

et al. 2016

Construction and Building Materials

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Thermal conductivity anisotropy in polypropylene foams prepared by supercritical CO2 dissolution

Cited by 28 publications

References 30 publications

Nanocomposite Foams of Polypropylene and Carbon Nanotubes: Preparation, Characterization, and Evaluation of their Performance as EMI Absorbers

Nanocomposite Foams of Polypropylene and Carbon Nanotubes: Preparation, Characterization, and Evaluation of their Performance as EMI Absorbers

Thermally insulating and fire-retardant lightweight anisotropic foams based on nanocellulose and graphene oxide

Mechanical and thermal performance of concrete and mortar cellular materials containing plastic waste

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