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Elongational flow properties of low‐density polyethylene and linear low‐density polyethylene from nonisothermal melt spinning experiments
Author(s) -
Bailey L. E.,
Cook D. G.,
Pronovost J.,
Rudin A.
Publication year - 1994
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760341908
Subject(s) - low density polyethylene , linear low density polyethylene , materials science , polyethylene , extrusion , composite material , strain hardening exponent , elongation , melt spinning , melt flow index , flow (mathematics) , spinning , polymer , ultimate tensile strength , mechanics , copolymer , physics
Low‐density polyethylene (LDPE) and also linear low‐density polyethylene (LLDPE) resins can be characterized by the degree of strain hardening and down‐gaging during elongation. A new method for the determination of the apparent elongational flow characteristics is presented. In a small scale apparatus, a molten monofilament is stretched under nonisothermal conditions similar to those found in tubular film extrusion. Measurement of resistance to elongational flow and apparent elongational strain rates permit the comparison of the process‐ability of different resins under specified conditions. The effect of melt temperature and extension ratio are examined. The importance of the molecular structure of both LDPE and LLDPE resins on these properties is also outlined.