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The fracture behavior of phenolphthalein polyether–ether ketone at elevated temperature for long terms
Author(s) -
Yang Yuming,
He Tianbai,
Yu Fusheng
Publication year - 1995
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.1995.070550410
Subject(s) - crazing , phenolphthalein , materials science , differential scanning calorimetry , glass transition , composite material , scanning electron microscope , ultimate tensile strength , fracture (geology) , brittleness , ether , chemistry , polymer , physics , organic chemistry , thermodynamics
The fracture behavior of phenolphthalein polyether–ether ketone (PEK‐C) affected by physical aging at 200°C was studied by tensile experiments, scanning electron microscopy, and differential scanning calorimetry observations. The ductile–brittle fracture transition (DBT) caused by physical aging can be considered as a competition between fracture mechanisms of crazing and shear yielding. The aging time required for the DBT is found to be around 400 h, based on the morphological studies and tensile experiments. The shear yielding component of the mechanical deformation could erase the aging effect, thus a deaging phenomenon occurs. We found that the deaging phenomenon has an intrinsic relationship with the extent of aging in the specimen and as a result of the fracture behavior. © 1995 John Wiley & Sons, Inc.