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Copolymers of 2-(2-methoxyethoxy)ethyl methacrylate (poly(MEO 2 MA)) are regarded as bioinert replacements of poly( N -isopropylacrylamide) in some biomedical applications. Networks of poly(MEO 2 MA) of various architecture form thermo-responsive hydrogels. Here, we present dielectric and mechanical spectroscopy studies on segmental motions and network relaxation processes in linear poly(MEO 2 MA) and its networks - bare network and the network grafted with short poly(MEO 2 MA) chains. We show that the α process assigned to the segmental motions of poly(MEO 2 MA) is independent on the polymer topology and the glass transition temperature, T  g , associated with this process equals 235-236 K for all investigated systems. The α' relaxation observed above T  g by dynamical mechanical analysis is assigned to the sub-Rouse process. It strongly depends on the polymer network architecture and slows down by four orders of magnitude upon network formation.

Evolution of high-temperature molecular relaxations in poly(2-(2-methoxyethoxy)ethyl methacrylate) upon network formation