About: Softening of polyethylene powders at reactor conditions

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.sciencedirect.com/science/article/pii/S138589471300689X
Description	Polymer softening is a major problem in industrial gas phase polymerizations, because it enhances particle agglomeration and reactor wall fouling. It is thus desirable to investigate this phenomenon and identify safe operating conditions. We developed a new experimental method for the characterization of polyolefin softening and proposed a theory qualitatively correlating this phenomenon with the Young modulus. The developed laser dilatometry technique is based on the measurement of polyolefin powder deformations under a constant load at elevated temperatures. Our method enables to measure the softening of polyolefin powders in air and in hydrocarbon gases/vapors, which means that polyolefin softening can be studied at industrially relevant conditions. In the experimental part, we present results obtained for a broad set of polyethylene samples in various atmospheres. The results are in very good agreement with our theoretical expectations and thus verify the proposed effects of polymer properties and penetrant sorption on the softening of polyethylene. Polymer softening is a major problem in industrial gas phase polymerizations, because it enhances particle agglomeration and reactor wall fouling. It is thus desirable to investigate this phenomenon and identify safe operating conditions. We developed a new experimental method for the characterization of polyolefin softening and proposed a theory qualitatively correlating this phenomenon with the Young modulus. The developed laser dilatometry technique is based on the measurement of polyolefin powder deformations under a constant load at elevated temperatures. Our method enables to measure the softening of polyolefin powders in air and in hydrocarbon gases/vapors, which means that polyolefin softening can be studied at industrially relevant conditions. In the experimental part, we present results obtained for a broad set of polyethylene samples in various atmospheres. The results are in very good agreement with our theoretical expectations and thus verify the proposed effects of polymer properties and penetrant sorption on the softening of polyethylene. (en)
Title	Softening of polyethylene powders at reactor conditions Softening of polyethylene powders at reactor conditions (en)
skos:prefLabel	Softening of polyethylene powders at reactor conditions Softening of polyethylene powders at reactor conditions (en)
skos:notation	RIV/60461373:22340/13:43895660!RIV14-GA0-22340___
http://linked.open...avai/predkladatel	Fakulta chemicko-inženýrská
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GAP106/10/1912), S
http://linked.open...iv/cisloPeriodika	červen 2013
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Matuška, Petr Kosek, Juraj Chmelař, Josef
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemicko-inženýrská
http://linked.open...dnocenehoVysledku	106033
http://linked.open...ai/riv/idVysledku	RIV/60461373:22340/13:43895660
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Young modulus; Polyethylene; Polymer softening; Particle agglomeration; Gas-phase polymerization (en)
http://linked.open.../riv/klicoveSlovo	Polyethylene Young modulus Gas-phase polymerization Particle agglomeration Polymer softening
http://linked.open...odStatuVydavatele	CH - Švýcarská konfederace
http://linked.open...ontrolniKodProRIV	[30D24E26BD7A]
http://linked.open...i/riv/nazevZdroje	Chemical Engineering Journal
http://linked.open...in/vavai/riv/obor	CI
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Morphology-dependent sorption and diffusion of penetrants in polymers
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	228
http://linked.open...iv/tvurceVysledku	Gregor, Tomáš Kosek, Juraj Chmelař, Josef Bobák, Marek Fantinel, Fabiana Matuška, Petr
http://linked.open...ain/vavai/riv/wos	000326203500099
issn	1385-8947
number of pages	10 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.cej.2013.05.069
http://localhost/t...ganizacniJednotka	22340

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