Kinetics of phase separation in polyurethane/polystyrene semi-1 interpenetrating polymer networks. 1. Light transmission studies

1993 ◽  
Vol 32 (3) ◽  
pp. 289-293 ◽  
Author(s):  
Xiongwei He ◽  
Jean-Michel Widmaier ◽  
Guy C. Meyer
Keyword(s):  
Phase Separation ◽  
Light Transmission ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Transmission Studies ◽  
Kinetics Of

scholarly journals EFFECT OF AZOINITIATORS OF METHYL METHACRYLATE POLYMERIZATION ON THE FORMATION PROCESS AND MORFOLOGY OF POLYURETHANE /POLYMETHYL METHACRYLATE INTERPENETRATING POLYMER NETWORKS

2020 ◽  
Vol 86 (9) ◽  
pp. 39-54
Author(s):  
Liudmyla Kosynchuk ◽  
Oksana Antonenko ◽  
Volodymyr Grishchenko ◽  
Nataliia Busko ◽  
Taisa Ignatova ◽  
...  
Keyword(s):  
Phase Separation ◽  
Methyl Methacrylate ◽  
Chemical Reactions ◽  
Polymer Networks ◽  
Heterogeneous Systems ◽  
Interpenetrating Polymer Networks ◽  
Methyl Methacrylate Polymerization ◽  
Negative Effect ◽  
Kinetics Of

Interpenetrating polymer networks (IPN) are mixtures of two cross-linked polymers formed as a result of chemical reactions of in situ synthesis of components from single-phase initial mixtures. As a rule, due to the incompatibility of the components, a physical process of phase separation takes place with the formation of heterogeneous systems with insignificant interphase adhesion, which can have a negative effect on the physicochemical properties. To increase the compatibility of the components and to stabilize the systems, compatibilizers are introduced into the reaction mixtures. In this work the kinetics of the in situ formation of the components of polyurethane/poly(methyl methacrylate) interpenetrating polymer networks and the phase separation induced by chemical reactions in the presence of methyl methacrylate polymerization oligoazoinitiators in the reaction mixture were studied. Oligoazoinitiators contained fragments of a polyurethane chain also. It has been shown that the introduction of oligoazoinitiators of various chemical natures can control the process of IPN formation due to the formation of block copolymers during synthesis, which are compatibilizers of the mixture. They slow down the phase separation process and favor the formation of a finer IPN structure.

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

2008 ◽  
Vol 48 (3) ◽  
pp. 588-597 ◽  
Author(s):  
Lyudmyla V. Karabanova ◽  
Gisele Boiteux ◽  
Gerard Seytre ◽  
Isabelle Stevenson ◽  
Andrew W. Lloyd ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Hydroxyethyl Methacrylate
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