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Effect of melt spinning and cold drawing on structure and properties of poly (aryl ether ketone) (PAEK) fibers
Author(s) -
Hsiung C. M.,
Cakmak M.
Publication year - 1991
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.760310305
Subject(s) - materials science , crystallinity , composite material , ultimate tensile strength , differential scanning calorimetry , fiber , amorphous solid , small angle x ray scattering , melt spinning , scanning electron microscope , crystallography , optics , scattering , chemistry , physics , thermodynamics
The effects of melt spinning and cold drawing on structure development and resulting properties of poly (aryl ether ketone) (PAEK) have been investigated. Melt spun and subsequently cold drawn fibers were characterized by differential scanning calorimetry, wide angle X‐ray diffraction, small angle X‐ray diffraction, and birefringence techniques. At low take‐up speeds, essentially amorphous fibers are produced. High take‐up speeds result in development of crystallinity in the as‐spun fibers. Cold drawing above the, T g of PAEK causes further increase of crystallinity. Wide angle X‐ray patterns indicate progressive alignment of chains along the fiber axis in as spun as well as in cold‐drawn fibers with the draw down ratio and cold draw ratio. However, cold drawing was observed to broaden the WAXS peaks. SAXS patterns of cold drawn and fixed annealed fibers changed from two‐point to four‐point patterns indicating mosaic pattern formation of crystalline and amorphous regions. Mechanical properties including tensile strength, elongation at break, modulus, and yield strength were measured and correlated with fiber structure. Fracture surfaces of tensile tested fibers were observed using scanning electron microscopy and correlated with developed fiber structure.