Premium
Effect of entanglement on brittle‐ductile transition in polyethylene
Author(s) -
Kitao Koichi
Publication year - 2001
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.10816
Subject(s) - charpy impact test , materials science , dimple , brittleness , fracture (geology) , composite material , polyethylene , brittle fracture , transition temperature , deformation (meteorology) , metallurgy , toughness , condensed matter physics , superconductivity , physics
The brittle ductile transition temperature (BDTT) of polyethylene with different degrees of entanglement density produced by crosslinking was evaluated using the Charpy impact test. BDTT was defined as the temperature at which the Charpy impact value Et changed abruptly from low to higher values. The increase in entanglement density brought about only a slight fall in BDTT, although that led to an increase in Et at ambient temperature corresponding to the occurrence of a dimple type fracture. A transition model between brittle fracture, patchwork type fracture (craze‐like) and yielding deformation, depending on the degree of crosslinking, was proposed to explain those experimental results.