1. Phase separation in the polyurethane/poly(2-hydroxyethylmethacrylate) semi-interpenetrating polymer networks synthesized by different ways
- Author
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Karabanova, Lyudmyla, Boiteux, Gisèle, Seytre, Gérard, Stevenson, Isabelle, Lloyd, Andrew W., Mikhalovsky, Sergey V., Helias, Mikle, Sergeeva, Lyudmyla M., Lutsyk, Elena D., Svyatyna, Anna V., Institute of Macromolecular Chemistry of National Academy of Sciences of Ukraine, Ingénierie des Matériaux Polymères - Laboratoire des Matériaux Polymères et des Biomatériaux (IMP-LMPB), Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut de Chimie du CNRS (INC), Department of Pharmacy, University of Brighton, and University of Brighton
- Subjects
[CHIM.POLY]Chemical Sciences/Polymers - Abstract
International audience; The thermal, dynamic mechanical analysis, morphology and mechanical properties of semi-interpenetrating polymer networks based on crosslinked polyurethane (PU) and poly(2-hydroxyethyl methacrylate) (PHEMA) synthesized by photopolymerization and by thermopolymerization have been investigated. The thermal analysis has evidenced the two glass temperature transitions in the semi-ΙPNs and this is confirmed by the thermodynamic miscibility investigation of the systems. The Dynamic Mechanical Analysis spectra have shown that the phase separation is more significant in the thermopolymerized semi-ΙPNs: the tan δ peaks of constituent polymers are more distinct and the minimum between the two peaks is deeper. The calculated segregation degree values of semi-IPN's components are significantly higher for thermopolymerized semi-IPNs, thereby the process of phase separation in the thermopolymerized semi-IPNs is more developed. The structures of two series of samples investigated by SEM are completely different. The mechanical properties reflect these changes in structure of semi-IPNs with increasing amount of PHEMA and with the changing of the method of synthesis. The results suggest that the studied semi-IPNs are two-phase systems with incomplete phase separation. The semi-IPN samples with early stage of phase separation demonstrate higher mechanical characteristics.
- Published
- 2008