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t* shifts to shorter times. A generalized dependence of the gelation of the
hydrophilic polymer content.
- To determine the intrinsic viscosity of aqueous polymer solutions and
mixtures with the products of hydrolysis of TMOS. It has been shown that the
introduction of an inorganic component in the aqueous solution of the polymer
does not influence the conformational state of macromolecules. Determined the
pair interaction parameters.
- Turbidity spectrum method to study the kinetics of phase transformations
during the sol - gel and gel - xerogel transitions. It is shown that the mean
radius of the scattering centers gelling reaches a maximum value - 150 nm and
the range of sizes change upon transition to xero - gel is 0.3 to 1.5 microns. It is
hypothesized that amorphous silica nanoparticles resulting from the hydrolysis
and condensation TMOS adsorb the macromolecule hydrophilic polymers.
- By electron microscopy to study the structure of organic-inorganic
xerogels. It is found that all of them are heterogeneous systems with different
character size distribution of particles (fine particles and aggregates of
reticulated structure).
- Sorption of water vapor hydrophilic polymers of different molecular
weights, thermal history, physical condition and the availability of spatial
chemical crosslinks. Built sorption isotherms, held their detailed thermodynamic
analysis, calculated pair interaction parameters and the free energy of mixing.
The necessity of taking into account the contribution to the sorption capacity of
the sorbent osmotic pressure grid crystallites.
- Obtained and analyzed water vapor sorption isotherms of organic -
inorganic sorbents. It was found that the adsorption capacity of the composite
mixture is not an additive function of the composition. It calculates the degree of
inaccessibility of the active centers. A sorbent structure of the scheme, taking
into account the different types of interaction between the functional groups of
the polymer, an inorganic component and water.
- For the first time defined the boundary curves of phase transformations
in the three - component organic-inorganic systems.
Composite polymeric hydrogels
- examined their methods of preparation
and properties of various compositions based on hydrophilic polymers, and
mixtures thereof with inorganic nanoscale additives. The influence of physical or
covalent bonding between the components on the formation of the composite
hydrogel and their properties. Biphasic nature composite hydrogels determines
their advantages when used as supersorbents, membrane materials, tissue
substitutes living, drug carriers, materials for making soft contact lenses.
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