Abstract
By swelling to equilibrium and esr spin probe technique the changes in crosslinking density and polymer segment mobility in γ-irradiated polydimethylsiloxanes (PDMS) were determined in dependence of irradiation atmosphere and irradiation temperature. In comparison with the polymer samples irradiated in the presence of oxygen, the samples irradiated in vacuum showed in spite of a higher degree of crosslinking a higher mobility of the polymer segments. The discrepancy can be explained taking into account that irradiation in presence of oxygen generates polar side groups: -COOH, -CHO and -OH. Dipolar interactions and hydrogen donor acceptor interactions should contribute to the decreased mobility of polymer segments in presence of these groups.
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