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Similar Publications
Free-volume hole relaxation in molecularly oriented glassy polymers.
Phys Rev E Stat Nonlin Soft Matter Phys
February 2014
University of Missouri-Kansas City, Department of Chemistry, Kansas City, Missouri 64110, USA.
The free-volume hole relaxation in polycarbonate and poly(methyl methacrylate) with different levels of molecular orientation was studied by positron annihilation lifetime spectroscopy at variable pressures. The molecular orientation was achieved through a simple shear process performed at different temperatures and extrusion rates. It has been demonstrated that the β relaxation is largely responsible for the free-volume hole anisotropy after simple shear orientation.
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