Effect of molecular weight, branching and temperature on dynamics of polypropylene melts at very high shear rates

Drábek, Jiří; Zatloukal, Martin; Martyn, Mike T.

dc.title	Effect of molecular weight, branching and temperature on dynamics of polypropylene melts at very high shear rates	en
dc.contributor.author	Drábek, Jiří
dc.contributor.author	Zatloukal, Martin
dc.contributor.author	Martyn, Mike T.
dc.relation.ispartof	Polymer (United Kingdom)
dc.identifier.issn	0032-3861 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued	2018
utb.relation.volume	144
dc.citation.spage	179
dc.citation.epage	183
dc.type	article
dc.language.iso	en
dc.publisher	Elsevier
dc.identifier.doi	10.1016/j.polymer.2018.04.046
dc.relation.uri	https://www.sciencedirect.com/science/article/pii/S0032386118303422
dc.subject	Branching	en
dc.subject	High shear rate rheology	en
dc.subject	Polymer melt	en
dc.subject	Secondary newtonian viscosity	en
dc.description.abstract	Dynamics of linear polypropylene (L-PP) and long-chain branched polypropylene (LCB-PP) miscible blends, having weight average molecular weight between 64 and 78 kg/mol, was investigated via high shear rate rheology. Results obtained were compared with the corresponding data for L-PP. High-shear rate secondary Newtonian plateaus, η∞, were identified at three different temperatures for well entangled L-PP/LCB-PP blends above shear rates of 2·106 1/s and their dependence on weight average molecular weight, Mw, was successfully related as η∞(T)=K∞(T)·Mw n with the exponent n = 1.010. Interestingly, the temperature dependant proportionality constant K∞ was found to be about 10–20% lower for the blend in comparison with the pure L-PP whereas the parameter n was found to be the same for both systems. The average values of high-shear rate flow activation energy, E∞, for the blends was found to be slightly lower than for pure L-PP and comparable with low-shear rate flow activation energy of PP like oligomer squalane (C30H62; 2,6,10,15,19,23-hexamethyltetracosane). This suggests that polymer chains are fully disentangled at very high shear rates and chain branching can enhance the flow in this regime due to smaller coil size and higher availability of the free volume (i.e. lower monomeric friction coefficient) in comparison with their linear counterparts. © 2018 Elsevier Ltd	en
utb.faculty	Faculty of Technology
dc.identifier.uri	http://hdl.handle.net/10563/1007917
utb.identifier.obdid	43878935
utb.identifier.scopus	2-s2.0-85046129653
utb.identifier.wok	000432813400020
utb.identifier.coden	POLMA
utb.source	j-scopus
dc.date.accessioned	2018-05-18T15:12:07Z
dc.date.available	2018-05-18T15:12:07Z
dc.description.sponsorship	Grant Agency of the Czech Republic [16-05886S]
utb.contributor.internalauthor	Drábek, Jiří
utb.contributor.internalauthor	Zatloukal, Martin
utb.fulltext.affiliation	Jiri Drabek a , Martin Zatloukal a, * , Mike Martyn b a Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01, Zlín, Czech Republic b IRC in Polymer Engineering, School of Engineering, Design & Technology, University of Bradford, Bradford BD7 1DP, UK * Corresponding author. E-mail address: mzatloukal@utb.cz (M. Zatloukal).
utb.fulltext.dates	Received 16 February 2018 Received in revised form 11 April 2018 Accepted 15 April 2018 Available online 23 April 2018
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utb.fulltext.sponsorship	The authors wish to acknowledge Grant Agency of the Czech Republic (Grant registration No. 16-05886S) for the financial support. The author also wishes to acknowledge Joachim Fiebig (Borealis Polyolefine) for donation of the polypropylene melt blown samples and help with the GPC measurements and analysis.
utb.scopus.affiliation	Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, Zlín, Czech Republic; IRC in Polymer Engineering, School of Engineering, Design & Technology, University of Bradford, Bradford, United Kingdom
utb.fulltext.projects	16-05886S