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Effect of processing conditions on the structural gradients developed in injection‐molded poly(aryl ether ketone) (PAEK) parts. I. Characterization by microbeam X‐ray diffraction technique
Author(s) -
Hsiung C. M.,
Cakmak M.
Publication year - 1993
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.1993.070470116
Subject(s) - microbeam , crystallinity , amorphous solid , materials science , differential scanning calorimetry , arylene , diffraction , composite material , ether , x ray crystallography , polymer chemistry , crystallography , optics , aryl , chemistry , organic chemistry , physics , alkyl , thermodynamics
Depending on the processing conditions, poly(arylene ether ketone) exhibits unique structural gradients as a result of its thermomechanical history when it is injection‐molded. Gapwise structure gradients change from a fully amorphous to multilayer amorphous–semicrystalline–amorphous and, finally, to a uniformly semicrystalline one when mold temperature is increased. When injection speed is decreased, the crystallized layers become thicker, and at very slow injection speeds, the crystalline layers developed near the two surfaces of the parts approach each other at the core. These structure variations were characterized by differential scanning calorimetry, optical microscopy, and a matrixing microbeam X‐ray diffraction (MMBX) technique developed in our laboratories. The relationship between the structure gradients developed and the processing variables and the cavity geometry are discussed. © 1993 John Wiley & Sons, Inc.