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Influence of long chain branching on extrudate swell of low‐density polyethylenes
Author(s) -
Hamielec L. A.,
Vlachopoulos J.
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070280721
Subject(s) - die swell , low density polyethylene , branching (polymer chemistry) , swell , materials science , polyethylene , composite material , body orifice , long chain , shear (geology) , thermodynamics , polymer science , physics , ecology , extrusion , biology
An experimental study of extrudate swell has been carried out, involving five low‐density polyethylene (LDPE) samples of approximately the same molecular size but of different frequencies of long‐chain branching (LCB). The results show that the samples with higher frequencies of LCB exhibit a tendency to swell more than samples of lower frequency. This tendency is more pronounced for short L / D dies and high shear rates. It seems possible that LDPE samples of varying LCB frequencies can be differentiated by determining the swelling ratio ( d / D ) with orifice dies ( L / D ⋍ 0) at high throughput rates.