Influence of the Molecular Weight of Polyvinylpyrrolidone on the Physicomechanical Properties of Composite Polyamide Hyd
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INFLUENCE OF THE MOLECULAR WEIGHT OF POLYVINYLPYRROLIDONE ON THE PHYSICOMECHANICAL PROPERTIES OF COMPOSITE POLYAMIDE HYDROGEL MEMBRANES O. V. Suberlyak,1, 2 N. M. Baran,1 Yu. Ya. Melnyk,1 O. M. Grytsenko,1 and H. V. Yatsulchak1 We establish the regularities of formation of composite polymeric hydrogel membranes based on liquidstructured copolymers of 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP) modified by a thin layer of a mixture of polyamide-6 (PA-6) and PVP by the method of diffusion deposition from a formate solution. We study the physical and mechanical properties of the obtained composite membranes depending on the molecular weight of PVP in the structure of the copolymer and in the modifying mixture, as well as on the degree of adsorption of the PA-6–PVP mixture on the source hydrogels. It is shown that the strength of hydrogel membranes increases with the molecular weight of PVP in the hydrogel matrix structure and with its decrease in the PA-6–PVP formate solution. Keywords: hydrogel, polyvinylpyrrolidone, 2-hydroxyethyl methacrylate, polyamide-6, composite membrane.
Introduction Polymeric hydrogels are known in science for a long time. Hydrogels can be described as grid of hydrophilic polymeric chains filled with water. They are characterized by high sorption ability (they may contain more than 90% of water and sorb water-soluble substances of the organic or inorganic origins). Therefore, hydrogels are very flexible and similar to biological tissues. Hydrophilic polymeric matrices may undergo equilibrium and reversible swelling both in water and in aqueous solutions of organic and inorganic substances. Hydrogels obtained as a result can be used both in medicine (for the production of contact ophthalmic lenses, therapeutic transportation systems, endoprostheses, and bandages for burn therapy) and in sanitation (as water-absorbing materials) [1]. However, as a significant disadvantage of porous hydrogels, we can mention their low mechanical properties [2, 3]. Thus, the problem of increasing the mechanical strength of these materials appears to be extremely urgent and, hence, the process of formation of multilayer films is now extensively studied. Combined film materials in the form of multilayer films or coatings are produced to improve the strength characteristics of the material, to get defectless surface layers, and to obtain films with required special properties [4]. The combined films were manufactured, in particular, by mixing polymeric film materials with guaranteeing the required level of interlayer adhesion. The multicomponent polymeric solutions are used for the surface modification of membranes by applying thin heterolayers [5–7]. A method of application of thin-film 1 2
“L’vivs’ka Politekhnika” National University, Lviv, Ukraine.
Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 55, No. 5, pp. 133–139, September–October, 2019. Original article submitted February 21, 2019. 758
1068-820X/20/5505–0758
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