Abstract
The influence of poly(titanium oxide) obtained using the sol-gel method in 2-hydroxyethyl methacrylate medium on the viscoelastic and thermophysical properties of interpenetrating polymer networks (IPNs) based on cross-linked polyurethane (PU) and poly(hydroxyethyl methacrylate) (PHEMA) was studied. It was found that both the initial (IPNs) and organo-inorganic interpenetrating polymer networks (OI IPNs) have a two-phase structure by using methods of dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The differential scanning calorimetry methods and scanning electron microscopy (SEM) showed that the presence of poly(titanium oxide) increases the compatibility of the components of IPNs. It was found that an increase in poly(titanium oxide) content leads to a decrease in the intensity of the relaxation maximum for PHEMA phase and an increase in the effective crosslinking density due to the partial grafting of the inorganic component to acrylate. It was shown that the topology of poly(titanium oxide) structure has a significant effect on the relaxation behavior of OI IPNs samples. According to SEM, a uniform distribution of the inorganic component in the polymer matrix is observed without significant aggregation.
Highlights
In the last decade, due to the high rates of development of various industries, there is a need to obtain materials with the desired set of new operational properties
Was the formation of poly(titanium oxide) in the hydroxyethyl methacrylate (HEMA) medium during sol-gel synthesis established by using FTIR spectroscopy, and the appearance of complex interactions by the donor-acceptor mechanism and the nucleophilic substitution reaction with the formation of poly(titanium oxide)-oxoethyl methacrylate
It is worth noting that the distribution of the inorganic component in the polymer matrix is quite uniform without significant aggregation, which may indicate the presence of the appropriate physicochemical interaction between them. This is especially important for the manufacture of appropriate fluorescent matrices based on TiO2, when the latter is doped with a luminescent impurity [65,66,67]. It was established by using dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) methods that the OI interpenetrating polymer networks (IPNs) system is two-phase; the increase in the interfacial region share with the increase in poly(titanium oxide) content as well as their morphology according to scanning electron microscopy (SEM) indicates that the inorganic component acts as a compatibilizer
Summary
Due to the high rates of development of various industries, there is a need to obtain materials with the desired set of new operational properties. The development of new hybrid organic-inorganic nanocomposites is a topical area of polymer chemistry [1,2,3,4,5,6,7,8,9,10,11,12] In this case, the concept of “hybrid” emphasizes the chemical nature of the interaction of system components [13]. The optically transparent TiO2 particles incorporated in PHEMA thin films were prepared in [26], where their photocatalytic activity was successfully demonstrated Another important result that needs to be mentioned is the synthesis of PHEMA hydrogels containing low concentration of TiO2 nanoparticles, which show their potential use for cell implantation experiments in vivo [27]. Note that nanoporous anatase layers may become interesting for nonlinear optical applications [31]
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