Reduction of monomeric friction coefficient for linear isotactic polypropylene melts in very fast uniaxial extensional flow

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F21%3A63536578" target="_blank" >RIV/70883521:28110/21:63536578 - isvavai.cz</a>

Výsledek na webu

<a href="https://aip.scitation.org/doi/10.1063/5.0050859" target="_blank" >https://aip.scitation.org/doi/10.1063/5.0050859</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0050859" target="_blank" >10.1063/5.0050859</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Reduction of monomeric friction coefficient for linear isotactic polypropylene melts in very fast uniaxial extensional flow

Popis výsledku v původním jazyce

For the first time, the monomeric friction coefficient for fully aligned chains, ζaligned, was determined for three linear isotactic polypropylene melts (iPP) using a high-strain-rate limiting value of uniaxial extensional viscosity, ηE,U,∞, obtained from our recent experimental data [Drabek and Zatloukal, Phys. Fluids 32(8), 083110 (2020)] and expression relating ηE,U,∞ with ζaligned, which was derived for a fully stretched Fraenkel chain [Ianniruberto et al., Macromolecules 53(13), 5023-5033 (2020)]. It was found that the obtained ζaligned value is lower by a factor of 2.9-5.0 (or even by a factor of 8.7-16.5 if the effect of polydispersity is included) compared to the equilibrium friction coefficient, ζeq, defined according to Doi and Edwards. This strongly supports recent arguments from rheological data and molecular simulations that a reduction in the friction coefficient must be considered in order to understand dynamics of polymer melts in very fast flows.

Název v anglickém jazyce

Reduction of monomeric friction coefficient for linear isotactic polypropylene melts in very fast uniaxial extensional flow

Popis výsledku anglicky

For the first time, the monomeric friction coefficient for fully aligned chains, ζaligned, was determined for three linear isotactic polypropylene melts (iPP) using a high-strain-rate limiting value of uniaxial extensional viscosity, ηE,U,∞, obtained from our recent experimental data [Drabek and Zatloukal, Phys. Fluids 32(8), 083110 (2020)] and expression relating ηE,U,∞ with ζaligned, which was derived for a fully stretched Fraenkel chain [Ianniruberto et al., Macromolecules 53(13), 5023-5033 (2020)]. It was found that the obtained ζaligned value is lower by a factor of 2.9-5.0 (or even by a factor of 8.7-16.5 if the effect of polydispersity is included) compared to the equilibrium friction coefficient, ζeq, defined according to Doi and Edwards. This strongly supports recent arguments from rheological data and molecular simulations that a reduction in the friction coefficient must be considered in order to understand dynamics of polymer melts in very fast flows.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA21-09174S" target="_blank" >GA21-09174S: Viskoelastické neizotermální modelování procesu vytlačování polymerních fólií pro výrobu membrán zahrnující tokem indukovnou krystalizaci</a><br>

Návaznosti

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

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Physics of Fluids

ISSN

1070-6631

e-ISSN

—

Svazek periodika

33

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000677497300001

EID výsledku v databázi Scopus

2-s2.0-85105563246