Lvivska Polytechnika National University

Kamieniec Podolski, Ukraine

Lvivska Polytechnika National University

Kamieniec Podolski, Ukraine
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Bashta B.,Lvivska Polytechnika National University | Bashta B.,University of North Texas | Brostow W.,University of North Texas | Granowski G.,University of North Texas | Hnatchuk N.,University of North Texas
Macromolecular Symposia | Year: 2016

Functional oligomers were synthesized via a reaction of ED-24 epoxy resin or a peroxy derivative of that resin with free peroxy and epoxy groups with adipic acid and via interaction between derivative of pyromellitic dianhydride and peroxy derivative of the same resin in the presence of benzyl triethylammonium chloride. The effects of oligomer presence, oligomer nature and amount on the crosslinking of poly(vinyl chloride) (PVC) mixtures were investigated. The thermal stability of synthesized oligomers and PVC mixtures based on them were determined, as was resistance to aging. Schematics of cross-linking reactions of modified mixtures are proposed. Higher thermal stability and better resistance to aging have been achieved. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


Bratychak M.,Lvivska Polytechnika National University | Brostow W.,University of North Texas | Iatsyshyn O.,Lvivska Polytechnika National University | Shyshchak O.,Lvivska Polytechnika National University
Materials Research Innovations | Year: 2015

Reactive oligomers with free epoxy and peroxy groups based on a cyanuric epoxy resin and tertbutylhydroperoxide (PDCER) have been synthesised in the presence of 18-Crown-6 + ZnCl2 as a catalytic system. The effect of temperature and process time on the PDCER properties has been determined. The PDCER structure has been confirmed by chemical and IR-spectroscopic analyses. Using ED-20 commercial epoxy resin (70 mass parts), petroleum resin (5 mass parts), TGM-3 oligoesteracrylate (10 mass parts), PDCER (25 mass parts), and polyethyleneamine as a hardener, the stepwise crosslinking has been performed at room temperature for 24 h and then at 383, 403 or 423 K for 15, 30, 40 and 60 min. Three-dimensional films containing both epoxy and peroxy groups have been obtained. © 2016 Informa UK Limited, trading as Taylor & Francis Group.


Stetsyshyn Yu.,Lvivska Polytechnika National University | Kostruba A.,Lviv Academy of Commerce | Jaczewska J.,Jagiellonian University | Zaichenko A.,Lvivska Polytechnika National University | And 4 more authors.
Thin Solid Films | Year: 2010

Formation kinetics and the nanolayer structure are determined for fluorescent complexes, which are composed of oligoperoxide and europium (OP-Eu), and are adsorbed to glass from water-ammonia solutions. The effective surface fraction x modified by OP-Eu is evaluated (with the Cassie equation) from receding contact angles. Its temporal behavior is repeated by the average adlayer thickness d, determined from ellipsometry, indicating rapid adsorption followed by gradual desorption. The fraction x increases with d to saturate at ∼ 90% for 57 nm. Atomic Force Microscopy micrographs and refractive indices do not reflect simple composite surfaces. Therefore a thickness effect on OP-Eu surface energy is also advocated. Fluorescent microscopy confirms luminescent properties of OP-Eu, applicable for protein detection. © 2010 Elsevier B.V. All rights reserved.


Stetsyshyn Y.,Lvivska Polytechnika National University | Raczkowska J.,Jagiellonian University | Budkowski A.,Jagiellonian University | Kostruba A.,Lviv Academy of Commerce | And 7 more authors.
Langmuir | Year: 2015

Properties of novel temperature-responsive hydroxyl-containing poly(pentaerythritol monomethacrylate) (PPM) coatings, polymerized from oligoperoxide grafted to glass surface premodified with (3-aminopropyl)triethoxysilane, are presented. Molecular composition, chemical state, thickness, and wettability are examined with time of flight-secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), ellipsometry, and contact angle measurements, respectively. Temperature-induced changes in hydrophobicity of grafted PPM brushes are revealed by water contact angle and ellipsometric measurements. Partial postpolymerization modification of hydroxyl groups (maximum a few percent), performed with acetyl chloride or pyromellitic acid chloride, is demonstrated to preserve thermal response of coatings. Adsorption of bovine serum albumin to PPM brushes, observed with fluorescence microscopy, is higher than on glass in contrast to similar hydroxyl-containing layers reported as nonfouling. Enhanced and temperature-controlled protein adsorption is obtained after postpolymerization modification with pyromellitic acid chloride. © 2015 American Chemical Society.


Stetsyshyn Y.,Lvivska Polytechnika National University | Fornal K.,Jagiellonian University | Raczkowska J.,Jagiellonian University | Zemla J.,Jagiellonian University | And 9 more authors.
Journal of Colloid and Interface Science | Year: 2013

Poly(oligo(ethylene glycol)ethyl ether methacrylate (POEGMA246) coatings were successfully fabricated using novel approach via polymerization from oligoperoxide grafted to premodified glass substrate. Wettability, content and composition of coatings fabricated with different polymerization times were determined using contact angle measurements, ellipsometry and Time of Flight-Secondary Ion Mass Spectrometry (TOF-SIMS). Thermo- and pH-responsive properties of POEGMA246 coatings were found to depend significantly on concentration of the grafted POEGMA246. Coatings fabricated with polymerization time 30. h exhibit not only temperature- but also pH-dependence of wettability. Thermal response of wettability, measured between 20 and 32. °C, was prominent at pH 9 and 7 and diminished or was absent at pH 5 and 3, indicating a transition between hydrated loose coils and hydrophobic collapsed chains, blocked at low pH. Protein adsorption, observed by fluorescence microscopy and analyzed semi-quantitatively using integral geometry approach, decreased dramatically for model protein (lentil lectin labeled with fluorescein isothiocyanate) at transition from pH 5 to pH 9, showing only very weak thermal-dependence. Strong protein adsorption response to pH and very weak one to temperature was confirmed by TOF-SIMS and Principal Component Analysis. © 2013 Elsevier Inc.


Stetsyshyn Y.,Lvivska Polytechnika National University | Zemla J.,Jagiellonian University | Zolobko T.,Lvivska Polytechnika National University | Fornal K.,Jagiellonian University | And 9 more authors.
Journal of Colloid and Interface Science | Year: 2012

Poly(N-isopropylacrylamide) (PNIPAM) coatings attached to glass with novel approach involving polymerization from oligoperoxide grafted to surface with (3-aminopropyl)triethoxysilane exhibit not only temperature- but also pH-dependence of wettability and protein adsorption. Wettability and composition of coatings, fabricated with different polymerization times, were determined using contact angle measurements and Time Of Flight-Secondary Ion Mass Spectrometry (TOF-SIMS), respectively. Thermal response of wettability, measured between 20 and 40. °C, was prominent at pH 9 and 7 and diminished or absent at pH 5 and 3. This indicates a transition between hydrated loose coils and hydrophobic collapsed chains that is blocked at low pH. Higher surface roughness and dramatically increased adsorption of model protein (lentil lectin labeled with fluorescein isothiocyanate) were observed with AFM and fluorescence microscopy to occur in hydrophobic phases (at pH 3, for pH varied at constant temperature of 22. °C and at ∼33. °C, for temperature varied at constant pH 9). Protein adsorption response to pH was confirmed by TOF-SIMS and Principal Component Analysis. © 2012 Elsevier Inc.


PubMed | AGH University of Science and Technology, Lvivska Polytechnika National University, Jagiellonian University and Lviv Academy of Commerce
Type: Journal Article | Journal: Langmuir : the ACS journal of surfaces and colloids | Year: 2015

Properties of novel temperature-responsive hydroxyl-containing poly(pentaerythritol monomethacrylate) (PPM) coatings, polymerized from oligoperoxide grafted to glass surface premodified with (3-aminopropyl)triethoxysilane, are presented. Molecular composition, chemical state, thickness, and wettability are examined with time of flight-secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), ellipsometry, and contact angle measurements, respectively. Temperature-induced changes in hydrophobicity of grafted PPM brushes are revealed by water contact angle and ellipsometric measurements. Partial postpolymerization modification of hydroxyl groups (maximum a few percent), performed with acetyl chloride or pyromellitic acid chloride, is demonstrated to preserve thermal response of coatings. Adsorption of bovine serum albumin to PPM brushes, observed with fluorescence microscopy, is higher than on glass in contrast to similar hydroxyl-containing layers reported as nonfouling. Enhanced and temperature-controlled protein adsorption is obtained after postpolymerization modification with pyromellitic acid chloride.


Kalay S.,Yeditepe University | Stetsyshyn Y.,Lvivska Polytechnika National University | Lobaz V.,Czech Institute of Macromolecular Chemical | Harhay K.,Lvivska Polytechnika National University | And 2 more authors.
Nanotechnology | Year: 2015

In this study, water-dispersed thermo-responsive boron nitride nanotubes (BNNTs) were prepared in a simple two-step process, where on the first step oligoperoxide was grafted via the interaction of amino groups (defects) of BNNTs with pyromellitic chloroanhydride fragments in oligoperoxide molecules. The second step involves N-isopropylacrylamide (NIPAM) graft polymerization 'from the surface' of oligoperoxide-functionalized BNNTs resulting in poly(N-isopropylacrylamide) (PNIPAM) coating. The pristine and functionalized BNNTs were characterized by thermogravimetric analysis, Fourier transform infrared spectroscopy, ultraviolet-visible spectrophotometry, dynamic light scattering, scanning electron microscopy and atomic force microscopy. PNIPAM-functionalized BNNTs exhibit excellent dispersibility in water and possess thermo-responsive properties. The water-dispersion of thermo-responsive PNIPAM-functionalized BNNTs can help their potential use in biomedical applications as 'smart' surfaces, nanotransducers and nanocarriers. © 2016 IOP Publishing Ltd.


PubMed | Lvivska Polytechnika National University
Type: Journal Article | Journal: Journal of colloid and interface science | Year: 2012

Poly(N-isopropylacrylamide) (PNIPAM) coatings attached to glass with novel approach involving polymerization from oligoperoxide grafted to surface with (3-aminopropyl)triethoxysilane exhibit not only temperature- but also pH-dependence of wettability and protein adsorption. Wettability and composition of coatings, fabricated with different polymerization times, were determined using contact angle measurements and Time Of Flight-Secondary Ion Mass Spectrometry (TOF-SIMS), respectively. Thermal response of wettability, measured between 20 and 40C, was prominent at pH 9 and 7 and diminished or absent at pH 5 and 3. This indicates a transition between hydrated loose coils and hydrophobic collapsed chains that is blocked at low pH. Higher surface roughness and dramatically increased adsorption of model protein (lentil lectin labeled with fluorescein isothiocyanate) were observed with AFM and fluorescence microscopy to occur in hydrophobic phases (at pH 3, for pH varied at constant temperature of 22C and at 33C, for temperature varied at constant pH 9). Protein adsorption response to pH was confirmed by TOF-SIMS and Principal Component Analysis.


PubMed | Lvivska Polytechnika National University
Type: | Journal: Journal of colloid and interface science | Year: 2013

Poly(oligo(ethylene glycol)ethyl ether methacrylate (POEGMA246) coatings were successfully fabricated using novel approach via polymerization from oligoperoxide grafted to premodified glass substrate. Wettability, content and composition of coatings fabricated with different polymerization times were determined using contact angle measurements, ellipsometry and Time of Flight-Secondary Ion Mass Spectrometry (TOF-SIMS). Thermo- and pH-responsive properties of POEGMA246 coatings were found to depend significantly on concentration of the grafted POEGMA246. Coatings fabricated with polymerization time 30 h exhibit not only temperature- but also pH-dependence of wettability. Thermal response of wettability, measured between 20 and 32C, was prominent at pH 9 and 7 and diminished or was absent at pH 5 and 3, indicating a transition between hydrated loose coils and hydrophobic collapsed chains, blocked at low pH. Protein adsorption, observed by fluorescence microscopy and analyzed semi-quantitatively using integral geometry approach, decreased dramatically for model protein (lentil lectin labeled with fluorescein isothiocyanate) at transition from pH 5 to pH 9, showing only very weak thermal-dependence. Strong protein adsorption response to pH and very weak one to temperature was confirmed by TOF-SIMS and Principal Component Analysis.

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