Supercritical CO2 and polycarbonate based nanocomposites: A critical issue for foaming

Monnereau, Laure; Urbanczyk, Laetitia; Thomassin, Jean‐Michel; Alexandre, Michaël; Jérôme, Christine; Huynen, Isabelle; Bailly, Christian; Detrembleur, Christophe

doi:10.1016/j.polymer.2014.03.035

Cited by 27 publications

(16 citation statements)

References 65 publications

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“…A reversible physical cross-linkage forms when ionic aggregates by the formation of ionic association/dissociation; it restricts chain mobility and resulting in rising η*, consequently. 28 Figure 1B confirms that the strong physical cross-linkage between ionic groups is attributed to the increment in η* of PBSUIs.…”

Section: Viscosity Behavior Of Pbsuis Varied By Deah Contentsupporting

confidence: 61%

“…Moreover, the shear‐thinning behavior of PBSUIs begins in a lower frequency than that of PBSU, implying that η* of PBSUIs melts possess stronger shear‐thinning tendency and it becomes stronger with the increase of UIG content. A reversible physical cross‐linkage forms when ionic aggregates by the formation of ionic association/dissociation; it restricts chain mobility and resulting in rising η*, consequently . Figure B confirms that the strong physical cross‐linkage between ionic groups is attributed to the increment in η* of PBSUIs.…”

Section: Resultsmentioning

confidence: 54%

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Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Zhang

Wang

et al. 2018

Polymers for Advanced Techs

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Poly(butylene succinate) urethane ionomer (PBSUIs) foams with nano‐microcellular morphology were fabricated using supercritical CO2 (sc‐CO2) at different parameters. Effect of urethane ionic group (UIG) content (ranged from 1% to 5%) on the rheology and crystallization of PBSUIs were evaluated by intrinsic, dynamic rheological, X‐ray diffraction, and differential scanning calorimetry measurements. The results show that the complex viscosity of PBSUIs vastly improved, while their intrinsic viscosity and crystallinity decreased. They also evidenced that CO2 promoted the formation of crystallites in the amorphous and increased the Xc of PBSU and PBSUIs foams. Scanning electron microscope was employed to explore the influences of UIG content and foaming parameters on the morphologies of PBSUIs microcellular foams, and it revealed that UIG content was the dominated factor. The cell size and cell densities of PBSUIs microcellular foams were smaller than 5.0 micrometers and higher than 1.5 × 1010 cells/cm3, respectively, even foamed at diverse variations of foam temperature and pressure. Interestingly, PBSUIs with 3% and 5% UIG content achieved microcellular foams in nano‐cells, high‐stretched elliptical shape. The mechanism was ascribed that these PBSUIs with high melt viscosities could retard the CO2 bubbles to merge during the foam process and induce the cells to stretch and orient in depressururization direction. This study proposed a novel method for fabricating PBS nano‐microcellular foams.

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Section: Viscosity Behavior Of Pbsuis Varied By Deah Contentsupporting

confidence: 61%

Section: Resultsmentioning

confidence: 54%

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Zhang

Wang

et al. 2018

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Additionally, the absorbed power was higher than 90 % for composites with only 2 wt.% MWCNT prepared by precipitation‐polymerization . In another work, MWCNT/PC composites were prepared by melt‐extrusion and compression and expanded by supercritical CO 2 ; they found that limiting the diffusion time of CO 2 inside the material, it was possible to obtain foams with a gradient morphology which were capable of absorbing up to 90 % of the incident radiation ,…”

Section: Foam‐based Materialsmentioning

confidence: 99%

Electromagnetic Shielding Materials in GHz Range

González

Pozuelo

Baselga

2018

The Chemical Record

112

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The state-of-the art in the design and the manufacture methods of the different electromagnetic shielding materials has been reviewed. This topic has become a mainstream field of research because of the electromagnetic pollution generated by telecommunication technology development. The review is centred in absorbent materials and shows a general overview of how the absorption properties of such composites can be tailored through changes in geometry, composition, morphology, and the filler particles content. Although different types of materials are explained, the text is mainly focused on carbon materials such as graphene and carbon nanotubes. In this way, the importance of the dispersion of the conductive fillers in different polymer matrices is discussed. In addition, an extensive study on new complex architectures such as foam-based materials is presented. Finally, the combination of carbon fillers with other constituents such as metallic nanoparticles is mentioned. In all these studies, the efficiency of the composites as absorbent or reflective of electromagnetic radiation is discussed.

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“…Monnereau et al studied the effect of foaming on the electrical properties of PC/MWCNT nanocomposites. In the first study, the maximum value of EC of about 2.25 × 10 −2 S/cm of unfoamed samples was observed at 2 wt% MWCNT loading, and for foamed sample, the highest EC of around 2.3 × 10 −2 S/cm was observed at only 0.5 wt% loading.…”

Section: Pc/cnt Nanocompositesmentioning

confidence: 99%

A review on the mechanical, electrical and EMI shielding properties of carbon nanotubes and graphene reinforced polycarbonate nanocomposites

Bagotia

Choudhary

Sharma

2018

Polymers for Advanced Techs

104

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Recently, it has been found that carbon nanotubes (CNTs) and graphene could prove to be the most promising carbonaceous fillers in polymers nanocomposites field because of their better structural and functional properties. Their uniform dispersion in polymer matrix leads to significant improvements in their several properties. This paper reviews the effect of nanofillers, ie, CNTs, derivatized CNTs, and graphene on the polycarbonate nanocomposite and its application in aerospace, automobile, sports, electronic sectors, and various industries. The comparative analysis of carbon‐based fillers on the different properties of polycarbonate nanocomposites is also included.

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Supercritical CO2 and polycarbonate based nanocomposites: A critical issue for foaming

Cited by 27 publications

References 65 publications

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Electromagnetic Shielding Materials in GHz Range

A review on the mechanical, electrical and EMI shielding properties of carbon nanotubes and graphene reinforced polycarbonate nanocomposites

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Supercritical CO2 and polycarbonate based nanocomposites: A critical issue for foaming

Cited by 27 publications

References 65 publications

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO2

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO2

Electromagnetic Shielding Materials in GHz Range

A review on the mechanical, electrical and EMI shielding properties of carbon nanotubes and graphene reinforced polycarbonate nanocomposites

Contact Info

Product

Resources

About

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂