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T. T. Alekseeva, N. V. Babkina, N. V. Iarova, O. M. Gorbatenko
«Influence of the Method of Obtaining Titanium-Containing Interpenetrating Polymer Meshes on the Kinetics of Their Formation, Viscoelastic and Thermophysical Properties When Varying the Ti-Component Content»
PACS numbers: 61.41.+e, 62.40.+i, 64.70.pj, 81.07.Pr, 82.35.-x, 83.60.-a, 83.80.-k
There are synthesized two series of Ti-containing interpenetrating polymer networks (Ti-IPN\(_1\) and Ti-IPN\(_2\)) based on cross-linked polyurethane (PU), poly(hydroxyethyl methacrylate) (PHEMA) and Ti-containing component, which is obtained in different ways by varying the content of Ti component. Ti-containing copolymer based on both 2-hydroxyethyl methacrylate (HEMA) and Ti(OPr\(^i\))\(_4\) isopropoxide is used for formation of Ti-IPN\(_1\), and for formation Ti-IPN\(_2\) is used poly(titanium oxide) ((–TiO\(_2\)–)\(_n\)) synthesized in the environment of HEMA by sol–gel method. As found, the Ti-comonomer polymerization in Ti-IPN\(_1\) systems is 1.5–2 times faster, in contrast to the formation of Ti-containing PHEMA component in Ti-IPN\(_2\) systems due to the difference of the structure topology of the Ti component. In the formation of Ti-IPN\(_1\), a cross-linked PHEMA is formed, in which the sites of the cross-link are fragments (–TiO\(_2\)–), and at the formation of Ti-IPN\(_2\), hybrid PHEMA/(–TiO\(_2\)-)\(_n\) are formed in the presence of poly(titanium oxide) of the branched three-dimensional structure. Kinetic factors influence on the viscoelastic and thermophysical properties of investigated Ti-containing IPNs. As established, both series of Ti-IPN\(_s\) demonstrate increase of the cross-link density in the polymer systems with increasing of the Ti-component content. However, the rapid polymerization of Ti-comonomer in the case of Ti-IPN\(_1\) formation leads to the form of more crosslinked Ti-containing PGEMA and blocking of the PU phase formation. Moreover, the slower polymerization of HEMA in the presence of poly(titanium oxide) during the formation of Ti-IPN\(_2\) leads to the formation of more bulky structures with the lower-density polymer network.
Keywords: polyurethane, polytitanoxide, interpenetrating polymer networks, kinetics, viscoelastic properties, thermophysical properties
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