Experimental investigation of flow induced molecular weight fractionation phenomenon for two linear HDPE polymer melts having same Mn and Mw but different Mz and Mz+1 average molecular weights

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F12%3A43867966" target="_blank" >RIV/70883521:28110/12:43867966 - isvavai.cz</a>
Alternative codes found
RIV/70883521:28610/12:43867966
Result on the web
<a href="http://dx.doi.org/10.1016/j.ces.2012.06.049" target="_blank" >http://dx.doi.org/10.1016/j.ces.2012.06.049</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ces.2012.06.049" target="_blank" >10.1016/j.ces.2012.06.049</a>

Result language
angličtina
Original language name
Experimental investigation of flow induced molecular weight fractionation phenomenon for two linear HDPE polymer melts having same Mn and Mw but different Mz and Mz+1 average molecular weights
Original language description
In this work, flowinducedmolecularweightfractionation for twolinearHDPEpolymers having the same polydispersity index (Mw/Mn) but differentMz and Mz+1molecularweightaverages, has been experimentally investigated. It has been revealed that first, onset aswell as intensity of slip?stick instability and flowinducedmolecularweightfractionation are in direct relationship, i.e., low molecularweightpolymer chains start to fractionate from the main polymermelt stream at the onset of slip?stick flow regime initiating formation of low viscosity layer at the die wall, which leads to its consequent unwanted accumulation at the die lips?die drool phenomenon. Second, due to enhanced melt elasticity (by the presence of long linear chains of linearHDPEpolymer), the flowinducedmolecularweightfractionation is more effective which results in narrow molecularweight distribution of die drool sample containing small amount of long chains. Third, buildup ratio sensitivity to apparent shear rate is the highes
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CD - Macromolecular chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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