title: Evolution of high-temperature molecular relaxations in poly(2-(2-methoxyethoxy)ethyl methacrylate) upon network formation.
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,Tg, associated with this process equals 235-236 K for all investigated systems. The α' relaxation observed aboveTgby 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.
authors: Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
authors: Marcin
authors: M
authors: Kozanecki
authors: Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
authors: Marcin
authors: M
authors: Pastorczak
authors: Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
authors: Lidia
authors: L
authors: Okrasa
authors: Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
authors: Jacek
authors: J
authors: Ulanski
authors: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213 USA.
authors: Jeong Ae
authors: JA
authors: Yoon
authors: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213 USA.
authors: Tomasz
authors: T
authors: Kowalewski
authors: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213 USA.
authors: Krzysztof
authors: K
authors: Matyjaszewski
authors: Max Planck Institute for Polymer Research, Ackermannweg 10, 55021 Mainz, Germany.
authors: Kaloian
authors: K
authors: Koynov
keywords: ATRP; Molecular relaxations; Poly(2-(2-methoxyethoxy)ethyl methacrylate); Polymer network