The report describes the features of physical and mechanical properties and absorption capacity of hydrogels based on highly esterified pectin. Experimental data showed the correlation between these values. Also, an attempt is made to explain the obtained dependencies via the hydrogel morphology and the mechanism of its formation.
The formation of the hydrogel polymer matrix duringthe gelatin cross-linking with dioxirane derivatives of polyoxyethylene glycolswere studied.The optimal conditions for their synthesis were determined. The characteristics of the hydrogel (swelling in different media, mechanical properties at different temperatures) were obtained depending on the type of dioxirane derivative and prepolymer ratio. The possibility of introducing several drugs into hydrogels was established and the release of these drugs was found to be prolonged.
Physico-mechanical properties of the products based on filled epoxy-oligomeric mixtures composed of Epidian-5 epoxy resin, oligoesteracrylate TGM-3 and monoperoxide derivative of Epidian-6 epoxy resin (PO) have been investigated. CaCO3 was used as a filler and polyethylene polyamine was a curing agent. The effect of PO and CaCO3 on the gel-fraction content and physico-mechanical properties was examined. Using a scanning electron microscopy (SEM) the morphology of the samples has been studied.
In order to improve the properties of epoxy resins they are modified by the various compounds, in particular oligoesters. Compositions based on ED-20 epoxy resin and unsaturated oligoesters are structured in the presence of polyethylene polyamine (PEPA). The oligoester acts as a plasticizer that is not chemically bounded to the molecules of spatially crosslinked structure. It leads to the deterioration of their physical, mechanical and chemical properties during the working process of film based on epoxy-oligoester compositions.
The processes of receiving and the properties of thin polymer pellicles of network structure on the basis of reactionary copolymers were researched. It was shown that the cross linked network structures are formed as a result of the reactions of peroxide groups presented in polymer structure as well as due to the interactions of anhydride groups with bifunctional alcohols. The optimal conditions and component correlation for the formation of network three-dimensional structures with high linking level were determined.