Peculiarity of Elastic and Inelastic Properties of Radiation Cross-linked Hydrogels

The dependences of efficiency of the radiation cross-linking hydrogels by the elastic and inelastic characteristics were investigated. The static elastic module σЕ at compression and extension, elastic limit σЕ, effective fluidity limit fl, strength limit at compression σst for the radiation cross-linked hydrogel with 5, 6, 8, 10 % polyvinyl alcohol were measured. The values of static module E, elastic limit σЕ, effective fluidity limit σfl, strength limit at compression σst of the radiation cross-linked hydrogels are determined by the formation of the polyvinyl alcohol molecules nanoclusters. The optimum compositions of initial hydrogels and electronic irradiation regimes, which allow making the radiation cross-linked hydro polymeric composites with the necessary characteristics at the radiation doses, were found. The modified polymer real network has the large number of different defects, which do not participate in the transfer of the strains in the network, and, therefore, do not contribute to its elastic module G, E. It is important that the radiation destruction of the polyvinyl alcohol molecules main chains, which contain the double CC bonds, influences the formation of the formed hydrogels network. The bandages based on the radiation cross-linked hydrogels are elastic thick films of transparent jelly sterile material that consists of C = 85 ÷ 90 % distilled water. Such bandages must be biologically compatible and not stick to the wounds for the grant of the urgent help at bleeding or burns. They can contain some antiseptic, anesthetic, hemostatic drugs. The nature of the interaction of the polymer hydrogel with the body, its permeability to various substances and cells, the period of biodegradation, its mechanical properties are determined by the parameters of the three-dimensional polymer network that is formed during the formation of the hydrogel. The prediction and control of hydrogels mechanical properties are very important in assessing the applicability of hydrogels.