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observed effect is due to the special structure of the UPU, the terms of transfer
through them hydrated proton.
Investigation of the structure of these hydrogels by small-angle neutron
scattering can be seen that they are heterogeneous, characterized by different
sizes of the structural elements: about 70 nm inherent to the grid, including
AMSK units and 30-40 nm for less hydrophilic mesh on the basis of a cross-
linked copolymer of AN-CAP [48]. The result indicates that in this system, in
spite of the hydrophilic nature of the two grids may phase separation of the
polymer components.
A number of the UPU-hydrogels formed from polyelectrolyte meshes with
the opposite charge of the macromolecules [53-55]. Systems of this type actually
have the properties of CHD and interpolymer complexes which allows to obtain
composite hydrogels with high thermal stability and mechanical strength. Their
distinguishing feature - a very high water content and are called superporistymi
hydrogels. High strength characteristics of such hydrogels implemented with
optimum anion and cation grids. Enrichment of a type of IPN polymer networks
leads to a drastic decrease in strength of the material.
Composite hydrogels
formed from hydrophilic and hydrophobic
polymers, there is no question as to their biphasic, since they are formed from a
thermodynamically incompatible polymers, when hydrated water absorbs only
the hydrophilic component of the hydrogel composition. The nature of phase
separation, biphasic hydrogels and morphology are dependent on
thermodynamic and kinetic factors determined by physical-chemical properties
of the polymers and methods of manufacturing the composite material. Biphasic
hydrogels can be produced in virtually all known technologies, including
mechanical blending processes, and various methods of physical and chemical
(covalent) binding polymer phases.
Simple, is not commonly used method - mixing solutions or polymer
dispersions. When properly receiving biphasic hydrogel polymer mixtures can
ensure the formation of fine structures [56-58]. One of the options associated
with the introduction of a hydrophilic polymer colloid particles of another
polymer.
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