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Your search keyword '"Sergeeva, Lyudmyla M."' showing total 6 results
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6 results on '"Sergeeva, Lyudmyla M."'

1. Phase separation in the polyurethane/poly(2-hydroxyethyl methacrylate) semi-interpenetrating polymer networks synthesized by different ways

Author

Karabanova, Lyudmyla V., Boiteux, Gisele, Seytre, Gerard, Stevenson, Isabelle, Lloyd, Andrew W., Mikhalovsky, Sergey V., Helias, Mikle, Sergeeva, Lyudmyla M., Lutsyk, Elena D., and Svyatyna, Anna

Subjects
Molecular dynamics -- Observations -- Research -- Mechanical properties, Thermodynamics -- Observations -- Mechanical properties -- Research, Polyurethanes -- Mechanical properties -- Research, Engineering and manufacturing industries, Science and technology, Observations, Mechanical properties, Research
Abstract

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-IPNs 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-IPNs: 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. POLYM. ENG. SCI., 48:588-597, 2008. © 2008 Society of Plastics Engineers, INTRODUCTION Interpenetrating polymer networks (IPNs) are materials based on two or more polymers, each of them is chemically crosslinked or at least one network is synthesized in the presence of [...]

Published
2008

2. Phase separation in the polyurethane/poly(2-hydroxyethylmethacrylate) semi-interpenetrating polymer networks synthesized by different ways

Author

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

3. Gradient composites and semi-interpenetrating polymer. Networks based on polyurethane and poly(2-hydroxyethyl Methacrylate) for biomedical applications

Author

Karabanova, Lyudmyla, Sergeeva, Lyudmyla M., Lutsyk, Elena D., Svyatyna, Anna V., Seytre, Gérard, Lachenal, Gilbert, Boiteux, Gisèle, Lloyd, Andrew W., Mikhalovsky, Sergey 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
Published
2007

4. Gradient polyurethane/PHEMA composites and semi-interpenetrating polymer networks for biomedical application

Author

Karabanova, Lyudmyla, Sergeeva, Lyudmyla M., Brovko, O.L., Lloyd, Andrew W., Mikhalovsky, Sergey V., Boiteux, Gisèle, Seytre, Gérard, Institute of Macromolecular Chemistry of National Academy of Sciences of Ukraine, Department of Pharmacy, University of Brighton, University of Brighton, 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), and Université de Lyon-Institut de Chimie du CNRS (INC)

Subjects
[CHIM.POLY]Chemical Sciences/Polymers
Published
2007

5. Dielectric studies of relaxation behaviour of semi- interpenetrating polymer networks based on polyurethane and poly(2-hydroxyethyl methacrylate

Author

Karabanova, Lyudmyla, Sergeeva, Lyudmyla M., Svyatyna, Anna V., Seytre, Gérard, Boiteux, Gisèle, Stevenson, Isabelle, 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), and Université de Lyon-Institut de Chimie du CNRS (INC)

Subjects
[CHIM.POLY]Chemical Sciences/Polymers, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

6. Phase Separation in the Polyurethane! Poly(2-hydroxyethyl methacrylate) Semi-Interpenetrating Polymer Networks Synthesized by Different Ways.

Author

Karabanova, Lyudmyla V., Boiteux, Gisele, Seytre, Gerard, Stevenson, Isabelle, Lloyd, Andrew W., Mikhalovsky, Sergey V., Helias, Mikie, Sergeeva, Lyudmyla M., Lutsyk, Elena D., and Svyatyna, Anna

Subjects
POLYMER networks, PHASE separation method (Engineering), CROSSLINKED polymers, POLYURETHANES, PHOTOPOLYMERIZATION, SPECTRUM analysis, MECHANICAL behavior of materials, SEPARATION (Technology), ORGANIC synthesis
Abstract

The article describes the phase separation and properties of the semi-interpenetrating polymer networks (IPNs) based on crosslinked polyurethane and linear poly(2-hydroxyethyl methacrylate) prepared by photopolymerization and thermopolymerization. According to the authors, the phase separation is more significant in the thermopolymerized semi-IPNs as shown by the dynamic mechanical analysis spectra. The authors add that the semi-IPN samples with early stage of phase separation exhibit higher mechanical characteristics.

Published
2008
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