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A study of brittle‐ductile transition in polyethylene
Author(s) -
Kitao Koichi
Publication year - 1997
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.11721
Subject(s) - charpy impact test , materials science , high density polyethylene , embrittlement , crystallinity , brittleness , composite material , ultimate tensile strength , metallurgy , tensile testing , polyethylene
The brittle‐ductile transition temperatures (BDTT) of polyethylenes with different degrees of crystallinity, such as LDPE, LLDPE, MDPE, and HDPE, were evaluated using Charpy impact test. The effect of the specimen cooling condition on the BDTT was a main concern in the study. A rise in the cooling plate temperature ( Tp ) for high density resins brought about a fall in BDTT and an increase in the Charpy impact value Et . However, embrittlement was observed during a tensile test for HDPE samples with a rise in Tp . A crack shielding effect by microvoid formation is proposed as the toughening mechanism for HDPE.