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described above; vinyl polysiloxane saturation grid comprising a cross-linking
monomer (diallyl phthalate, triallyl cyanurate or vinyl ether glycol) and
photoinitiator conducting copolymerization by UV-irradiation and obtaining
silicone IPN-PVA; alcoholysis PVA-mesh with the formation of silicon- silicon
hydrogel - PVA.
IPN structure in such a scheme is given in a second synthetic step in which
vinyl acetate is used - monomer combines with significantly better compared to
the polysiloxane more hydrophilic monomers used in the preparation of
silicone-hydrogels, which enables the process in the absence of solvent.
polysiloxane System - PVA is not thermodynamically consistent. However, the
solubility parameters of the two polymers are relatively close (15 (MJ/m3) 1/2
and 19 to polysiloxane (MJ/m3) 1/2 PVA [110], making it unlikely macrophase
separation of the polymers and enables to produce a composite with a small size
structural elements. This is indicated by the transparency of the material is
retained in the final product polysiloxane - PVA and dry, and hydrated state.
Studies have shown silicone - hydrogels by atomic-force microscopy and small
angle neutron scattering [48], the average size of fragments of hydrogel is 25
nm. Other characteristics of the new silicone - hydrogels are at the level of other
unique properties.
Thus, the structure and properties of silicone-hydrogels may be adjusted
relatively uncomplicated methods, choice of components used in the preparation
of AMS. These features allow the creation of silicone-hydrogel UPU not only
for soft contact lenses, but also for other applications. Can be used as drug
carriers [98, 111, 112], polymer electrolytes [99.113], oxygen-permeable
membranes [114], etc. The technological advantages of the method to obtain
IPN Synthesis of silicone-.. In the form of hydrogels conetworks. In - First, the
UPU technology involves the use of best available components. In - the second,
the individual production step can be carried out without the UPU solvent. B -
Third, when using IPN synthesis technology eliminates the need for surface
treatment of products impart wettability.
A large group of composite polymeric hydrogels relates to an electrically
conductive material, representing a combination of conventional polymeric
hydrogel polymers such as polyaniline [115-117] or polypyrrole [118, 119].
Receive such materials synthesis technology semi-IPN. Unlike the
synthesis of silicone-IPN hydrogel of the first stage of the process - the radical
copolymerization of hydrophilic monomers with crosslinking agents, and in the
second stage is introduced into the hydrophilic grid pyrrole or aniline and is
carried out oxidative polymerization of the latter. Materials combine conductive
properties, the ability to swell in water and a high mechanical strength. Their
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