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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/70883521:28610/12:43867966

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Engineering Science

ISSN

0009-2509

e-ISSN

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Svazek periodika

81

Číslo periodika v rámci svazku

22

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

"146?156"

Kód UT WoS článku

000307885000014

EID výsledku v databázi Scopus

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