Journal
COLLOID AND POLYMER SCIENCE
Volume 293, Issue 5, Pages 1357-1367Publisher
SPRINGER
DOI: 10.1007/s00396-015-3517-8
Keywords
Poly(2-(2-methoxyethoxy)ethylmethacrylate); Molecular relaxations; Polymer network; ATRP
Categories
Funding
- Ministry of Science and Higher Education of Poland [N N209200738]
- United States Department of Energy, USA [ER 45998]
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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 alpha 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 alpha' 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.
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