Effect of molecular weight and extensional rheology on melt blown process stability for linear isotactic polypropylenes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F19%3A63523555" target="_blank" >RIV/70883521:28110/19:63523555 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.5109500" target="_blank" >http://dx.doi.org/10.1063/1.5109500</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5109500" target="_blank" >10.1063/1.5109500</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of molecular weight and extensional rheology on melt blown process stability for linear isotactic polypropylenes

Popis výsledku v původním jazyce

Two linear isotactic polypropylenes with different molecular weight have been used to produce nonwovens via melt blown technology in order to understand role of molecular weight and extensional rheology on fiber diameter distribution. Extensional rheology was assessed by the strain rate dependent uniaxial extensional viscosity (estimated from the entrance pressure drop using the Gibson method) as well as through infinite shear to zero-shear viscosity ratio η∞/η0 (obtained directly from the shear viscosity data measured in a very wide shear rate range), which was shown to be related with temperature and basic molecular characteristics of given polymers via a simple equation. This allowed us to determine η∞/η0 ratio for additional nine polypropylene melt blown nonwovens with known weight average molecular weight and coefficient of fiber diameter variation, taken from the open literature. Obtained results indicates that firstly, an increase in the molecular weight decreases η∞/η0 as well as maximum attainable normalized extensional viscosity ηE,∞/3η0 and secondly, there exists optimum η∞/η0 ratio, at which the coefficient of fiber diameter variation is minimal.

Název v anglickém jazyce

Effect of molecular weight and extensional rheology on melt blown process stability for linear isotactic polypropylenes

Popis výsledku anglicky

Two linear isotactic polypropylenes with different molecular weight have been used to produce nonwovens via melt blown technology in order to understand role of molecular weight and extensional rheology on fiber diameter distribution. Extensional rheology was assessed by the strain rate dependent uniaxial extensional viscosity (estimated from the entrance pressure drop using the Gibson method) as well as through infinite shear to zero-shear viscosity ratio η∞/η0 (obtained directly from the shear viscosity data measured in a very wide shear rate range), which was shown to be related with temperature and basic molecular characteristics of given polymers via a simple equation. This allowed us to determine η∞/η0 ratio for additional nine polypropylene melt blown nonwovens with known weight average molecular weight and coefficient of fiber diameter variation, taken from the open literature. Obtained results indicates that firstly, an increase in the molecular weight decreases η∞/η0 as well as maximum attainable normalized extensional viscosity ηE,∞/3η0 and secondly, there exists optimum η∞/η0 ratio, at which the coefficient of fiber diameter variation is minimal.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA16-05886S" target="_blank" >GA16-05886S: Výzkum vlivu smykové a tahové reologie polymerních tavenin na stabilitu produkce meltblown nanovláken a fólií</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Novel Trends in Rheology VIII, AIP Conference Proceedings

ISBN

978-0-7354-1839-4

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

12

Strana od-do

12

Název nakladatele

American Institute of Physics Inc.

Místo vydání

Maryland

Místo konání akce

Zlín

Datum konání akce

30. 7. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000479303100009