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Amphiphilic CHD occur about the same set of problems, which are
discussed above. The most important of them - it is the combination of
hydrophilic and hydrophobic components in the material, its morphology,
resulting from phase separation during the formation of the UPU. With regard to
methods for producing amphiphilic UPU, then they are no less diverse than the
methods of synthesis conetworks. Variety is not only due to the possibility of
using numerous reagents, reactions occurring via different mechanisms, but also
their implementation in the preparation of simultaneous and sequential IPN or
semi - IPN.
PRT amphiphilic hydrophilic component forms the radical polymerization
methods such monomers as acrylamide, N, N-dimethylacrylamide, VP, HEMA,
acrylic and methacrylic acid and PEO prepolymers (oligomers with terminal
(meth) acrylate groups). To use hydrophobic mesh synthesis ionic and radical
polymerization of vinyl monomers, oxidative polymerization of pyrrole and
aniline, reaction conversion oligomers containing functional groups (e.g.,
hydrosilylation reaction between a hydride - oligosiloksanami and vinyl-
containing reaction with hydroxyl oligomers di - isocyanates, etc.). Synthesis
PRT usually carried out in the presence of a solvent, providing homogeneity of
the reaction system before the start of the process.
From a technological point of view, the easiest way to obtain a composite
simultaneous IPN synthesis method, when both the grid are formed
simultaneously by different mechanisms. It is recognized that this simple
technology can not always be used from - the inability to produce a material
with the desired morphology and properties. Examples simultaneous IPN
synthesis is - silicone-hydrogels (soft contact lens) - a method which is given in
patent [95], wherein the hydrosilylation reaction is carried out simultaneously
between the oligo-functional siloxanes in the presence of a catalyst (H2PtCl6).
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