Subcritical gas‐assisted processing of ethylene vinyl alcohol + nanoclay composites
Ethylene vinyl alcohol (EVOH) was melt compounded with an organomodified nanoclay (NC) at a loading level of 5% by weight in a twin‐screw extruder using a subcritical gas‐assisted process (SGAP). Carbon dioxide and nitrogen were used as blowing agents to induce foaming inside of the barrel of the ex...
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| Veröffentlicht in: | Polymer composites 2020-04, Vol.41 (4), p.1584-1594 |
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| container_title | Polymer composites |
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| creator | Ellingham, Thomas Yilmaz, Galip Duddleston, Lukas Li, Zhutong Turng, Lih‐Sheng |
| description | Ethylene vinyl alcohol (EVOH) was melt compounded with an organomodified nanoclay (NC) at a loading level of 5% by weight in a twin‐screw extruder using a subcritical gas‐assisted process (SGAP). Carbon dioxide and nitrogen were used as blowing agents to induce foaming inside of the barrel of the extruder and as the melt exits the die. Samples processed with SGAP demonstrated better dispersion of NC vs the traditional extrusion process due to the additional stresses that bubble expansion provides during foaming. The dispersion was assessed by dynamic rheology, wide‐angle X‐ray diffraction, scanning electron microscopy, and microcomputed tomography. Additionally, it was found that the inert gasses used in SGAP prevented some of the thermo‐oxidative degradation EVOH experienced during processing, as evidenced by thermogravimetric analysis and Fourier transform infrared spectroscopy. |
| doi_str_mv | 10.1002/pc.25480 |
| format | Article |
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Carbon dioxide and nitrogen were used as blowing agents to induce foaming inside of the barrel of the extruder and as the melt exits the die. Samples processed with SGAP demonstrated better dispersion of NC vs the traditional extrusion process due to the additional stresses that bubble expansion provides during foaming. The dispersion was assessed by dynamic rheology, wide‐angle X‐ray diffraction, scanning electron microscopy, and microcomputed tomography. 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Carbon dioxide and nitrogen were used as blowing agents to induce foaming inside of the barrel of the extruder and as the melt exits the die. Samples processed with SGAP demonstrated better dispersion of NC vs the traditional extrusion process due to the additional stresses that bubble expansion provides during foaming. The dispersion was assessed by dynamic rheology, wide‐angle X‐ray diffraction, scanning electron microscopy, and microcomputed tomography. Additionally, it was found that the inert gasses used in SGAP prevented some of the thermo‐oxidative degradation EVOH experienced during processing, as evidenced by thermogravimetric analysis and Fourier transform infrared spectroscopy.</abstract><cop>Hoboken, USA</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/pc.25480</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0001-8022-9224</orcidid></addata></record> |
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| identifier | ISSN: 0272-8397 |
| ispartof | Polymer composites, 2020-04, Vol.41 (4), p.1584-1594 |
| issn | 0272-8397 1548-0569 |
| language | eng |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Barrels (extruders) Blowing agents Carbon dioxide Dispersion dispersions Ethylene Extrusion foam extrusion Foaming Fourier transforms Infrared analysis mixing nanocomposites nanoparticles Polymer matrix composites Rheological properties Rheology Thermogravimetric analysis |
| title | Subcritical gas‐assisted processing of ethylene vinyl alcohol + nanoclay composites |
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