Rheological Indicators for Environmental Stress Cracking Resistance of Polyethylene

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F15%3A43873039" target="_blank" >RIV/70883521:28610/15:43873039 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.3139/217.2963" target="_blank" >http://dx.doi.org/10.3139/217.2963</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3139/217.2963" target="_blank" >10.3139/217.2963</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Rheological Indicators for Environmental Stress Cracking Resistance of Polyethylene

Popis výsledku v původním jazyce

Most studies on environmental stress cracking resistance (ESCR) of polymers have focused on performing mechanical tests in the solid state. In this work, investigations in the melt state were carried out, to identify potential melt indicators for a relative measure of ESCR. A normalized characteristic relaxation time (lambda(N)), obtained from dynamic shear experiments, was established as a valid measure of ESCR of linear low density polyethylene, where a large content of short chain branches is present. In addition, the melt strain hardening coefficient (MSHC), obtained from extensional rheological methodologies, was found to be another potential and reliable indicator of ESCR. An inverse correlation between MSHC and ESCR was observed, indicating an inverse relationship between ESCR and chain extensibility in the melt. Furthermore, a new factor called "melt hardening stiffness (mHS)" was developed from the slope of a stress vs. Hencky strain obtained from a Sentmanat extensional rheom

Název v anglickém jazyce

Rheological Indicators for Environmental Stress Cracking Resistance of Polyethylene

Popis výsledku anglicky

Most studies on environmental stress cracking resistance (ESCR) of polymers have focused on performing mechanical tests in the solid state. In this work, investigations in the melt state were carried out, to identify potential melt indicators for a relative measure of ESCR. A normalized characteristic relaxation time (lambda(N)), obtained from dynamic shear experiments, was established as a valid measure of ESCR of linear low density polyethylene, where a large content of short chain branches is present. In addition, the melt strain hardening coefficient (MSHC), obtained from extensional rheological methodologies, was found to be another potential and reliable indicator of ESCR. An inverse correlation between MSHC and ESCR was observed, indicating an inverse relationship between ESCR and chain extensibility in the melt. Furthermore, a new factor called "melt hardening stiffness (mHS)" was developed from the slope of a stress vs. Hencky strain obtained from a Sentmanat extensional rheom

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

2015

Kód důvěrnosti údajů

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

Název periodika

International polymer processing

ISSN

0930-777X

e-ISSN

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Svazek periodika

30

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

70-81

Kód UT WoS článku

000351291800007

EID výsledku v databázi Scopus

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