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Investigation of the structural changes in high‐speed spun yarns of polyamide 6 by means of WAXS employing synchrotron radiation
Author(s) -
Schmack Gerhilt,
Beyreuther Roland,
Häußler Liane,
Tidick Peter Joachim,
Zachmann Hans Gerhard,
Koch Michel Henry Jean
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021951102
Subject(s) - differential scanning calorimetry , materials science , melting point , polyamide , small angle x ray scattering , crystallization , thermal stability , synchrotron radiation , recrystallization (geology) , tacticity , composite material , calcium stearate , crystallinity , polymer chemistry , scattering , crystallography , chemical engineering , polymer , optics , thermodynamics , chemistry , polymerization , paleontology , physics , biology , engineering , raw material , organic chemistry
Abstract The melting and recrystallization of yarns of polyamide 6 spun at different take‐up velocities ranging from 3 500 to 5 600 m/min was investigated by means of wide‐angle X‐ray scattering (WAXS) employing synchrotron radiation and by differential scanning calorimetry (DSC). It was shown that the first peak in the double melting peak of the DSC‐curves is caused by the melting of the γ‐crystals. The melting point is increased by approximately 5°C when the take‐up velocity is increased from 3 500 m/min to 5 600 m/min. The addition of calcium stearate to the material has no effect on the thermal stability of the crystals, but seems to have some effect on the crystallization rate.