Effect of the introduction of polydimethylsiloxane on the foaming behavior of block‐copolymerized polypropylene

Wang, Mingyi; Ma, Jun; Chu, Raymond; Park, Chul; Nan-qiao, Zhou

doi:10.1002/app.34854

Cited by 20 publications

(12 citation statements)

References 12 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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“…For details of the method, see ref. . Scanning electron microscopy (SEM) was used to characterize the cell morphology of the foamed samples.…”

Section: Methodsmentioning

confidence: 99%

Extrusion foaming behavior of a polypropylene/nanoclay microcellular foam

Wang

Qian

et al. 2016

J of Applied Polymer Sci

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With maleic anhydride grafted polypropylene (PP-g-MAH) as a compatibilizer, composites of block-copolymerized polypropylene (B-PP)/nanoclay were prepared. The effects of the PP-g-MAH and nanoclay content on the crystallization and rheological properties of B-PP were investigated. The microcellular foaming behavior of the B-PP/nanoclay composite material was studied with a single-screw extruder foaming system with supercritical (SC) carbon dioxide (CO 2 ) as the foaming agent. The experimental results show that the addition of nanoclay and PP-g-MAH decreased the melt strength and complex viscosity of B-PP. When 3 wt % SC CO 2 was injected as the foaming agent for the extrusion foaming process, the introduction of nanoclay and PP-g-MAH significantly increased the expansion ratio of the obtained foamed samples as compared with that of the pure B-PP matrix, lowered the die pressure, and increased the cell population density of the foamed samples to some extent. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44094.

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“…The density of the foamed samples was determined by the buoyancy method. For details of the method, see reference [6]. SEM was used to characterize cell morphology of the foamed samples.…”

Section: Methodsmentioning

confidence: 99%

Effect of Modifying Agent (ACR) on Cell Structure and Mechanical Properties of Extrusion-Foamed PVC Sheet

Wang¹,

Nan-qiao²,

Hu³

2015

Proceedings of the 2015 International Conference on Architectural, Civil and Hydraulics Engineering

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Abstract. Rigid polyvinyl chloride (R-PVC) foam sheets were prepared in a continuous extrusion foaming system by using supercritical CO 2 as the foaming agent. The effects of acrylic resin (ACR) on the rheological properties of PVC were investigated using a Brabender torque rheometer while other basic formula remained unchanged. The influences of ACR content on microstructure, and mechanical properties of PVC foamed sheet were investigated. The rheological test results showed that with the addition of ACR, the gelation time of the formula was gradually shortened while the equilibrium torque increased. With the increase of ACR content in the formula, the tensile strength, elongation at break, flexural strength and notched impact strength of PVC increased initially and then decreased, implying that there exists an optimum ACR content for improving the mechanical properties of foamed PVC sheet.

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Effect of the introduction of polydimethylsiloxane on the foaming behavior of block‐copolymerized polypropylene

Cited by 20 publications

References 12 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

Extrusion foaming behavior of a polypropylene/nanoclay microcellular foam

Effect of Modifying Agent (ACR) on Cell Structure and Mechanical Properties of Extrusion-Foamed PVC Sheet

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