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Subject: search.filters.subject.polyvinyl alcohol

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    Rheological properties of compositions based on modified polyvinyl alcohol
    (Видавництво Львівської політехніки, 2017-12-23) Antoniuk, Viktoria; Krasinskyi, Volodymyr; Khamula, Natalia; Yurkiv, Iryna; Lviv Polytechnic National University
    Developed of a method for producing structured waterproof films based on polyvinyl alcohol (PVA) and montmorillonite-polyvinylpyrrolidone mixture (MPM) to research the impact of borax, pH-environment and MPM content on the rheological properties PVA solutions and water absorption capacity of films based on them. The MPM mixture significantly affects on viscosity the characteristics of the solution polyvinyl alcohol provided their mixing in the ultrasonic field have been established. Composition of traces of sodium tetraborate in the aqueous solution eminent by the highest rates of viscosity. Also, designed compositions considerable influence pH at the viscosity, particularly compositions obtained in weakly alkaline environment with higher values of relative viscosity than compositions obtained in neutral and acidic environments.
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    Peculiarities of the oxidative polycondensation of aniline derivatives in solution of polyvinyl alcohol
    (Lviv Polytechnic Publishing House, 2015) Stasyshyn, Halyna; Zastavska, Galyna; Koval, Mariia; Dutka, Volodymyr; Ivan Franko National University of Lviv
    Studied oxidative polycondensation of aniline peroksydysulfatom ammonia in solution of polyvinyl alcohol. It is shown that water-soluble polymer can interact with aniline. Kinetic curves are characterized by oxidative polycondensation of two plots that indicate the nature of the avtokatolitychnyy. During the process available polymer-polymer materials that have filmforming and conductive properties.