Litteris et Artibus

Permanent URI for this communityhttps://ena.lpnu.ua/handle/ntb/39474

Browse

Subject: search.filters.subject.modification

Search Results

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Modification of polypropylene melt-blown fibers by photopolimeryzation of acrylic acid
    (Lviv Polytechnic Publishing House, 2016) Werner, Łukasz; Jackiewicz-Zagórska, Anna; Warsaw University of Technology
    The main objective of this study was to find the method of polymer fibrous filter modification which cause the increase in the oil droplets filtration efficiency. An attempt was made to affect on the fibers wettability, by changing among others the surface roughness. The tested filters were made of polypropylene using the melt-blown technique. They were modified via photopolymerization - UV irradiation, together with the monomers Acrylic acid (AA). Modified materials were tested by high quality test bench for measuring filtration efficiency of nanodroplets.
  • Thumbnail Image
    Item
    The effect of poly (vinyl chloride) and filler on technological properties of polyester composites
    (Видавництво Львівської політехніки, 2017-12-23) Katruk, Diana; Levytskyi, Volodymyr; Lviv Polytechnic National University
    The paper determines the influence of polymer modifier (poly (vinyl chloride)) and finely dispersed inorganic filler on the elastic-deformation and thermophysical properties of polyester materials. The research discovers the change of deformation modulus, elasticity modulus, high elasticity modulus, surface hardness, Vica heat resistance, and technological shrinkage of modified polyester composites filled with calcium carbonate and aluminum oxide.
  • Thumbnail Image
    Item
    Positron annihilation lifetime spectroscopy in application to nanostructured glasses and ceramics
    (Видавництво Львівської політехніки, 2017-12-23) Klym, Halyna; Kostiv, Yuriy; Lviv Polytechnic National University
    Modified nanostructured Ge-Ga-Se chalcogenide glasses and oxide MgO-Al2O3 ceramics were investigated using positron annihilation lifetime spectroscopy. It was shown that crystallization process in 80GeSe2-20Ga2Se3 glasses annealed at 380°C for 25 and 50 h indicates specific free-volume transformation. It is established that water vapor modifies defects located near grain boundaries in MgO-Al2O3 ceramics sintered at 1300 °C, the process being accompanied by void fragmentation at water adsorption with further void agglomeration at water desorption after drying.
  • Thumbnail Image
    Item
    Influence of poly(vinyl chloride) and polymer-silicate fillers on the properties of polyester resin
    (Lviv Polytechnic Publishing House, 2015) Katruk, Diana; Levytskyi, Volodymyr; Lviv Polytechnic National University
    The influence of polymer modifier poly(vinyl chloride) (PVC) and polymer-silicate fillers on the physicochemical regularities of structuring of unsaturated polyester resin have been investigated. It has been ascertained that addition of Zn-silicate fillers in polyester composition leads to slower curing speed, and the introduction of Ni-silicate fillers and PVC leads to accelerate the process of curing polyester oligomers. Physical-mechanical and corrosion properties of polyester materials modified by polyvinyl chloride and polymer-silicate fillers have been determined.