Abstract
The molecular mobility in poly(oligo(ethylene glycol) methyl ether methacrylate) (POEGMA) networks with varying side chain lengths (n = 2–19 oxyethylene groups), which are synthetized by radiation-induced crosslinking polymerization, has been investigated by dielectric spectroscopy. A complete relaxation map for these materials with four processes was created for the first time. At higher temperatures, α relaxation corresponding to the dynamic glass transition and α’ relaxation, which was likely correlated with sub-Rouse processes, were found. Below the dynamic glass transition, two Arrhenius-type processes were distinguished: the γ-process, which was assigned to the end (methoxy-) group; and weak β-relaxation, which was dependent on the oligoether chain length and was related to side chain movements. The fragility index for all of the POEGMA networks proves that these are strong glass-forming materials. In the partially crystalline samples with n > 7, the relaxation processes are strongly disturbed by cold crystallization and melting.
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