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Properties of oriented polyethylene bars of large cross section
Author(s) -
Courval Gregory,
Wang LiHui,
Porter Roger S.
Publication year - 1994
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.1994.070520905
Subject(s) - materials science , crystallinity , composite material , die swell , polyethylene , bar (unit) , extrusion , ultimate tensile strength , high density polyethylene , transverse plane , shrinkage , bending , cross section (physics) , modulus , young's modulus , structural engineering , physics , quantum mechanics , meteorology , engineering
The solid‐state extrusion technique has been used to prepare uniaxially oriented polyethylene bars with rectangular end cross sections of 6 × 50 mm 2 . They were extruded at 110°C from billets of high density polyethylene. The tensile modulus and strength for the extrudate with a draw ratio (DR) of 14 were 17.9 and 0.32 GPa, respectively. The mechanicals were also measured in the transverse direction by means of the proportional elastic limit (PEL) bending test. The PEL results do not change after DR 14 due to the fibrillate structure formation. Crystallinity and shrinkage tests were made on samples taken over the bar cross section. They show that uniform properties were achieved across the width of the bar with proper die design. © 1994 John Wiley & Sons, Inc.