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Statements

Subject Item
n2:RIV%2F60461373%3A22340%2F13%3A43895660%21RIV14-GA0-22340___
rdf:type
skos:Concept n19:Vysledek
rdfs:seeAlso
http://www.sciencedirect.com/science/article/pii/S138589471300689X
dcterms: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.
dcterms:title
Softening of polyethylene powders at reactor conditions Softening of polyethylene powders at reactor conditions
skos:prefLabel
Softening of polyethylene powders at reactor conditions Softening of polyethylene powders at reactor conditions
skos:notation
RIV/60461373:22340/13:43895660!RIV14-GA0-22340___
n19:predkladatel
n20:orjk%3A22340
n3:aktivita
n13:S n13:P
n3:aktivity
P(GAP106/10/1912), S
n3:cisloPeriodika
červen 2013
n3:dodaniDat
n18:2014
n3:domaciTvurceVysledku
n4:5328500 n4:3418847 n4:8123373
n3:druhVysledku
n11:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
106033
n3:idVysledku
RIV/60461373:22340/13:43895660
n3:jazykVysledku
n15:eng
n3:klicovaSlova
Young modulus; Polyethylene; Polymer softening; Particle agglomeration; Gas-phase polymerization
n3:klicoveSlovo
n6:Polymer%20softening n6:Young%20modulus n6:Polyethylene n6:Gas-phase%20polymerization n6:Particle%20agglomeration
n3:kodStatuVydavatele
CH - Švýcarská konfederace
n3:kontrolniKodProRIV
[30D24E26BD7A]
n3:nazevZdroje
Chemical Engineering Journal
n3:obor
n16:CI
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
6
n3:projekt
n21:GAP106%2F10%2F1912
n3:rokUplatneniVysledku
n18:2013
n3:svazekPeriodika
228
n3:tvurceVysledku
Fantinel, Fabiana Gregor, Tomáš Bobák, Marek Matuška, Petr Chmelař, Josef Kosek, Juraj
n3:wos
000326203500099
s:issn
1385-8947
s:numberOfPages
10
n10:doi
10.1016/j.cej.2013.05.069
n7:organizacniJednotka
22340