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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Effect of molecular weight and extensional rheology on melt blown process stability for linear isotactic polypropylenes
Original language description
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.
Czech name
—
Czech description
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Project
<a href="/en/project/GA16-05886S" target="_blank" >GA16-05886S: Investigation the effect of polymer melt shear and elongational rheology on production stability of meltblown nanofibers and films</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Novel Trends in Rheology VIII, AIP Conference Proceedings
ISBN
978-0-7354-1839-4
ISSN
0094-243X
e-ISSN
—
Number of pages
12
Pages from-to
12
Publisher name
American Institute of Physics Inc.
Place of publication
Maryland
Event location
Zlín
Event date
Jul 30, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000479303100009

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