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Abstract
The volume distribution and molecular dynamics of spin-probe (nitroxyl radical) in the gel-crystallized UHMWPE of different draw ratios (DR = 12,100) have been investigated. The spin-probes were found to occupy approximately 50% of the polymer volume in the necked samples and 20–30% in the samples drawn up to DR = 100. The mobility of the spin-probe in the samples studied is higher than that in the drawn and even in the undrawn samples of conventional melt-crystallized PE. This fact along with a low value of activation energy of spin-probe rotation (less than 10 kJ/mole) enables a conclusion that the regions of spin-probe localization are those with a significantly reduced density, such as pores, for examples. The analysis of the data obtained and the results of the structural study of the gel-crystallized samples by a SAXS and WAXS technique suggest that these pores are localized in interfibrillar space.
