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

Colloid and Polymer Science
Marcin KozaneckiKaloian Koynov

Abstract

Copolymers of 2-(2-methoxyethoxy)ethyl methacrylate (poly(MEO2MA)) are regarded as bioinert replacements of poly(N-isopropylacrylamide) in some biomedical applications. Networks of poly(MEO2MA) 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(MEO2MA) and its networks - bare network and the network grafted with short poly(MEO2MA) chains. We show that the α process assigned to the segmental motions of poly(MEO2MA) 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.

References

Dec 26, 2001·Chemical Reviews·K Matyjaszewski, J Xia
Oct 5, 2006·Journal of the American Chemical Society·Jean-François LutzAnn Hoth
Sep 16, 2010·Biomacromolecules·Sangwoo ParkKrzysztof Matyjaszewski
Dec 17, 2010·Chemistry, an Asian Journal·Jeong Ae YoonKrzysztof Matyjaszewski

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BETA
differential scanning calorimetry

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WinFIT

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