Journal
JOURNAL OF PLASTIC FILM & SHEETING
Volume 29, Issue 4, Pages 327-346Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/8756087913483751
Keywords
Low-density polyethylene blown film; draw down ratio; crystal orientation; X-ray diffraction; fracture toughness; essential work of fracture
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Recent research has shown that the resistance against crack initiation and propagation of polyethylene blown films depends on density, chain branching and crystal orientation next to the processing parameters. To assess low-density polyethylene blown film fracture toughness with different thicknesses, the essential work of fracture method has been conducted in this study. The thickness of the investigated low-density polyethylene films was regulated by the draw down ratio, which causes low-density polyethylene crystal orientation with the chain axis parallel to the machine direction at higher draw down ratios, influencing mechanical parameters and the fracture toughness. The crystal orientation was measured by X-ray diffraction. Blown films with thicknesses equal to or greater than 200 mu m exhibit no preferred orientation, which is consistent with various calculated mechanical and fracture mechanics parameters. Films of less than 200 mu m thickness show preferred machine direction crystal orientation and a distinct thickness influence on mechanical and fracture mechanics parameters.
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