The efficiency of using solutions based on mixtures of polyamide with polyvinylpyrrolidone (PVP) in formic acid as modifiers of highly permeable hydrogel membranes based on copolymers of PVP with 2-hydroxyethyl methacrylate was established. The modification ensures the formation of composite membranes with strengthened selectively permeable nano- and microlayers.
Processing of polymers and composites based on them by centrifugal molding is important for production the bodies of revolution, which are used in various industries. This article analyzes the centrifugal molding and presents the results of research about new areas of such materials applications. For instance as method for the hydrogel films production of materials based on copolymers of 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP), including filled hydrogels, which can be applicable in medicine, electrical and tool engineering.
The effect of the presence of finely dispersed metal fillers of various natures (Zn, Co, Ni) on the thermophysical characteristics (Vick heat resistance, glass transition temperature) of polyvinylpyrrolidone block copolymers with 2-hydroxyethylmethacrylate was studied. It was found that the heat resistance of the obtained composites significantly exceeds the heat resistance of unfilled copolymers and is in the range of 360-395K, depending on the nature and content of the metal filler.
Composite materials based on copolymers of polyvinylpyrrolidone and 2-hydroxyethylmethacrylate with combined fillers consisting of metal powders and graphite were obtained by the method of polymerization filling. The developed materials are characterized by sufficiently high physical and mechanical properties, increased electrical conductivity and water content. It was established that the addition of graphite to metal-filled copolymers increases the sensitivity of the electrical resistance of composites to moisture changes.
Sorption properties of polyvinylpyrrolidone copolymers regarding to different acid-base indicators, as well as heparin and iodine have been investigated. The amount of sorption active centers of synthesized copolymers depends upon synthesis conditions, namely upon temperature and initiator amount, and is determined by the nature of sorbates and copolymers functional groups.