Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 41, Issue 12, Pages 1375-1383Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/polb.10474
Keywords
drawing; ultrahigh molecular weight polyethylene fibers; supercritical carbon dioxide; mechanical properties; polymorphism
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The drawing behavior of ultrahigh molecular weight polyethylene fibers in supercritical carbon dioxide (scCO(2)) is compared to that in air at different temperatures. The temperature substantially influences the drawing properties in air, whereas in scCO(2), a constant draw stress and tensile strength are observed. Differential scanning calorimetry shows an apparent development of a hexagonal phase along with a significant increase in the crystallinity of air-drawn samples with increasing temperature. The existence of this phase is not confirmed by wide-angle X-ray scattering, which instead shows that air-drawn samples crystallize in an internally constrained manner. In contrast, scCO(2) allows crystals to grow without constraints through a possible crystal-crystal transformation, increasing the processing temperature to 11,0 degreesC. (C) 2003 Wiley Periodicals, Inc.
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