scholarly journals Influence of long chain branching on fiber diameter distribution for polypropylene nonwovens produced by melt blown process

2019 ◽  
Vol 63 (4) ◽  
pp. 519-532 ◽  
Author(s):  
Jiri Drabek ◽  
Martin Zatloukal
Keyword(s):  
Fiber Diameter ◽  
Diameter Distribution ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Fiber Diameter Distribution ◽  
Long Chain

Effect of Introducing Long Chain Branching on Fiber Diameter and Fiber Diameter Distribution in Melt Blowing Process of Polypropylene

2021 ◽  
Vol 36 (4) ◽  
pp. 403-409
Author(s):  
K. Iiba ◽  
W. Takarada ◽  
T. Kikutani
Keyword(s):  
Fiber Diameter ◽  
Viscosity Reduction ◽  
Diameter Distribution ◽  
Polymer Rheology ◽  
Melt Blowing ◽  
Melt Flow Rate ◽  
Long Chain Branching ◽  
Molten Polymers ◽  
Uniform Diameter ◽  
Long Chain

Abstract In the melt blowing process, the molten polymers extruded from nozzles are elongated by high-velocity and high-temperature air flow. In this study, with the aim of stabilizing the melt blowing process for producing nonwoven webs with fine diameter fibers, the effect of the control of polymer rheology by the introduction of either low melt flow rate (MFR) polypropylene (PP) or long chain branched PP (LCB-PP) to regular high MFR PP was investigated. Introduction of low MFR PP into regular PP increased shear viscosity and fibers of larger diameter were produced in the melt blowing process, while introduction of low MFR LCB-PP suppressed the elongational viscosity reduction with the increase of strain rate, and eventually spinning was stabilized. It was found that the blending of an optimum amount of LCB-PP to regular PP caused the stabilization of the melt blowing process. As a result, the formation of nonwoven webs consisting of fine fibers of rather uniform diameter distribution could be achieved.

Characterization of long chain branching: Dilution rheology of industrial polyethylenes

2002 ◽  
Vol 46 (2) ◽  
pp. 401-426 ◽  
Author(s):  
B. J. Crosby ◽  
M. Mangnus ◽  
W. de Groot ◽  
R. Daniels ◽  
T. C. B. McLeish
Keyword(s):  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

Character of long-chain branching in highly purified natural rubber

2010 ◽  
Vol 115 (6) ◽  
pp. 3645-3650 ◽  
Author(s):  
Sureerut Amnuaypornsri ◽  
Lucksanaporn Tarachiwin ◽  
Jitladda T. Sakdapipanich
Keyword(s):  
Natural Rubber ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain

The effect of long chain branching on the processability of polypropylene in thermoforming

2004 ◽  
Vol 44 (5) ◽  
pp. 973-982 ◽  
Author(s):  
A. D. Gotsis ◽  
B. L. F. Zeevenhoven ◽  
A. H. Hogt
Keyword(s):  
Chain Branching ◽  
Long Chain Branching ◽  
Long Chain
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