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Effect of molecular weight on dynamics of linear isotactic polypropylene melt at very high shear rates

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dc.title Effect of molecular weight on dynamics of linear isotactic polypropylene melt at very high shear rates en
dc.contributor.author Zatloukal, Martin
dc.contributor.author Drábek, Jiří
dc.contributor.author Martyn, Mike T.
dc.relation.ispartof Annual Technical Conference - ANTEC, Conference Proceedings
dc.date.issued 2018
utb.relation.volume 2018-May
dc.event.title 2018 Society of Plastics Engineers Annual Technical Conference, ANTEC 2018
dc.event.location Orlando, FL
utb.event.state-en United States
utb.event.state-cs Spojené státy americké
dc.event.sdate 2018-05-07
dc.event.edate 2018-05-10
dc.type conferenceObject
dc.language.iso en
dc.publisher Society of Plastics Engineers
dc.description.abstract In this work, three isotactic linear polypropylenes, with weight average molecular weights between 56 250 - 75 850 g/mol, have been characterized at 230 oC over a very wide shear rate range. A low shear rate primary Newtonian plateau, a pseudoplastic region and a well developed secondary Newtonian plateau were identified for all the polypropylene melts. Flow activation energy at low (E0) and high (E∞) shear rates was found to be 56.590 kJ/mol and 25.204 kJ/mol, respectively. For the first time, it has been discovered that the secondary Newtonian viscosity, η∞, depends linearly on the weight average molecular weight, Mw, in log-log scale as η∞ = 1.19. 10-6 M 1.084 . The observed slope close to 1 w between η∞ and Mw suggests that polymer chains in the melt are disentangled at the secondary Newtonian plateau region. This conclusion is supported by the experimental observation that the high shear rate flow activation energy E∞ for given PP melts is comparable with the flow activation energy of PP like oligomer (squalane, C30H62; 2,6,10,15,19,23-hexamethyltetracosane). © 2018 Society of Plastics Engineers. All rights reserved. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1009223
utb.identifier.obdid 43879117
utb.identifier.scopus 2-s2.0-85072981316
utb.identifier.coden ACPED
utb.source d-scopus
dc.date.accessioned 2019-11-20T10:30:30Z
dc.date.available 2019-11-20T10:30:30Z
utb.contributor.internalauthor Zatloukal, Martin
utb.contributor.internalauthor Drábek, Jiří
utb.fulltext.sponsorship The authors wish to acknowledge Grant Agency of the Czech Republic (Grant registration No. 16-05886S, Title: Investigation the effect of polymer melt shear and elongational rheology on production stability of meltblown nanofibers and films) for the financial support. The author also wishes to acknowledge Joachim Fiebig (Borealis Polyolefine) for donation of PP samples.
utb.scopus.affiliation Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, Zlin, 760 01, Czech Republic; IRC in Polymer Engineering, School of Engineering, Design and Technology, University of Bradford, Bradford, BD7 1DP, United Kingdom
utb.fulltext.projects 16-05886S
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