Browsing by Author "Slisenko Olga"

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    EFFECT OF DIAMINOSILANE DERIVATIVE ON THERMAL AND SWELLING BEHAVIOUR OF ACRYLIC ACID BASED HYDROPHILIC COMPOSITES
    (Lviv Polytechnic National University, Lviv, Ukraine, 2020-10-10) Slisenko Olga; Bei Iryna; Budzinska Vira
    Organic-inorganic hydrophilic composites based on sodium polyacrylate (PAANa) and poly-N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (PAPTMS) showed the improved swelling capacity at incorporation of PAPTMS. Changing of non-Fickian to Super case II swelling behaviour is observed at 20 wt % PAPTMS content. Enhancing of thermal stability and heat-resistance index of composite hydrogels compared to PAA is shown. Показано, що органо-неорганічні гідрофільні композити на основі частково нейтралізованої поліакрилової кислоти (ПAANa) та полі-N-(2-аміноетил)-3-амінопропілтріметоксисилану ( ПАПТМС) виявляють покращену здатність до набухання при використанні ПАПТМС. Встановлено, що при вмісті ПАПТМС 20 % мас. Тип дифузії змінюється на Super Case II. Визначено, що термостабільність та індекс термостійкості композитних гідрогелів у порівнянні з ПААNa є вищими.
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    Novel highly hydrophilic organic/inorganic composites based on polyacrylamide and silica: synthesis strategy, structure and swelling behaviour
    (The Polymer Society, Taipei 2019, 2019-06-12) Slisenko Olga; Mamunya Yevgen
    A series of novel hydrophilic organic-inorganic composites (OIC) with enhanced sorption properties were synthesized by onepotsynthesistechnique-insituradicalpolymerizationofacrylamide(AM)andhydrolyticpolycondensationofsodiumsilicatein aqueous solution. Formation of mixed organic-inorganic polyacrylamide (PAM)/SiO2 phase has been detected by FTIR spectroscopy (appropriate changes in H-bonds network structure of PAM) and DSC analysis (dramatic decreasing glass temperature ofPAM).AdditivedecreasingofmasslossofOICwithincreasingofSiO2 contentisexplainedbytheincreasingofPAM-content in mixed PAM/SiO2 phase on the interface of organic and inorganic phases. The formation of SiO2 aggregates with different dispersity,which,intheirturn,formsubmicronstructuresincompositeswithSiO2 contentmorethan15wt.%wasobservedfrom SEMdata.StructurizationofOICresultedintheenhancedsorptioncharacteristics(swellingcapacityoftheOICreaches2730%). SorptionkineticcurvesobtainedbothinisothermicandisochoricregimesdemonstratethattheswellingprocessofOICislimited by relaxation of PAM chains and can be described by sorption mechanism of Type II.
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    POLY(SODIUM ACRYLATE)/POLYSILOXANE HYDROGELS FOR THE ADSORPTION OF CATIONIC DYES
    (Research and Publishing Center of the Shevchenko Scientific Society, 2024-10-07) Slisenko Olga; Budzinska Vira; Tolstov Oleksandr