An Intriguing Array of Extrudate Patterns in Long‐Chain Branched Polymers During Extrusion

Autor: Sajjad Pashazadeh, Alexandra Aulova, Christos K. Georgantopoulos, Marko Bek, Iakovos Vittorias, Ingo F.C. Naue, Manfred Wilhelm, Roland Kádár
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Macromolecular Materials and Engineering, Vol 308, Iss 8, Pp n/a-n/a (2023)
Druh dokumentu: article
ISSN: 1439-2054
1438-7492
DOI: 10.1002/mame.202300088
Popis: Abstract The present study highlights a range of surface and volume extrudate patterns that can be detected during the extrusion flow of long‐chain branched polymers. Thus, four linear low‐density polyethylenes (LDPEs) have been extruded using a single‐screw extruder coupled to an inline optical imaging system. The selected LDPEs are selected to outline the influence of molecular weight and long‐chain branching on the types of melt flow extrusion instabilities (MFEI). Through the inline imaging system, space–time diagrams are constructed and analyzed via Fourier‐transformation using a custom moving window procedure. Based on the number of characteristic frequencies, peak broadness, and whether they are surface or volume distortions, three main MFEI types, distinct from those typically observed in linear and short‐chain branched polymers, are identified. The higher molecular weight, low long‐chain branching LDPEs exhibited all three instability types, including a special type volume instability. Independently of the molecular weight, higher long‐chain branching appeared to have a stabilizing effect on the transition sequences by suppressing volume extrudate distortions or limiting surface patters to a form of weak intensity type.
Databáze: Directory of Open Access Journals
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