David W. Schroeder,Jordan H. Freedman,James E. Gunter,Brian D. Salyer,H. Gene Hawkins
申请号：
US12849640
公开号：
US08137608B2
申请日:
2010.08.03
申请国别(地区):
US
年份:
2012
代理人:
摘要：
A radiation crosslinked (50 kGy), pressure-treated UHMWPE material has been developed by applying compressive force on a crosslinked polymer in a direction orthogonal to an axial direction. The deformed material is then cooled while held in a deformed state. The resulting material is anisotropic, with enhanced strength oriented along the axial direction. The directionally engineered material is oxidatively stable even after four weeks of accelerated aging in a pressure vessel containing five atmospheres of oxygen (ASTM F2003). Because of its oxidative stability, the deformation processed material is a suitable candidate for air-permeable packaging and gas sterilization, which has thus far been reserved for remelted highly crosslinked UHMWPEs.
