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Phase transitions in ultraoriented polyethylene fibers under moderate pressures: A synchrotron X-ray study |
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| Authors: | Dmitry M Rein Liron Shavit Rafail L Khalfin Yachin Cohen Ann Terry Sanjay Rastogi |
| Institution: | 1. Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel 32000;2. European Synchrotron Radiation Facility (ESRF), Beamline ID11, Grenoble, France;3. Department of Chemical Engineering, Dutch Polymer Institute/Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands |
| Abstract: | The effect of pressure on phase transformations of ultradrawn ultra-high-molecular-weight polyethylene (UHMWPE) fibers was examined by in situ X-ray diffraction measurements with synchrotron radiation. The mesomorphic hexagonal phase was metastable even at a relatively low pressure of about 100 bar. The effect of pressure on the melting transitions was larger than in chain-folded structures. The existence and metastability of the hexagonal phase is the basis of compaction technology of UHMWPE fibers in composite materials. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 53–59, 2004 |
| Keywords: | ultra-high-molecular-weight polyethylene (UHMWPE) fibers synchrotron melting under pressure recrystallization hexagonal phase polyethylene (PE) fibers phase behavior melting point |