Influence of irradiation temperature and oxygen on crosslink formation and segment mobility in gamma-irradiated polydimethylsiloxanes

H. Menhofer, J. Zluticky, H. Heusinger

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

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.

Original languageEnglish
Pages (from-to)561-566
Number of pages6
JournalRadiation Physics and Chemistry
Volume33
Issue number6
StatePublished - 1989
Externally publishedYes

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