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Temperature transitions and compatibility in gradient interpenetrating polymer networks
Author(s) -
Lipatov Yu. S.,
Karabanova L. V.,
Gorbach L. A.,
Lutsyk E. D.,
Sergeeva L. M.
Publication year - 1992
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990280202
Subject(s) - materials science , polymer , glass transition , sorption , polyurethane , methacrylate , mixing (physics) , compatibility (geochemistry) , phase (matter) , polymer chemistry , thermodynamics , composite material , monomer , chemistry , adsorption , organic chemistry , physics , quantum mechanics
Traditional and gradient IPNs of various composition have been prepared from cross‐linked polyurethane and poly(butyl methacrylate). For various layers of gradient IPN cut from the surface to the centre the glass transition temperatures and composition have been determined. The sorption of benzene vapour by various layers was measured, and from these data the free energy of mixing IPN components has been calculated. For all the layer compositions free energies of mixing are positive and dependent on the distance from the sample centre. This effect is thought to be connected not only with composition but with various conditions for phase separation in various layers. Each layer consists of two phases with their own glass transition temperatures. From these data, using the Fox equation, the composition of each phase for various layers have been calculated and the volume ratio of phase evolved was estimated.