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Information × Registration Number 0211U004438, 0108U001305 , R & D reports Title Physics-chemical feature of Polypropylene microfibers modification by nanosize additives of aerosils. popup.stage_title Head Tsebrenko Marya Vasilyevna, Registration Date 07-02-2011 Organization Kiev national university technology and design. popup.description2 Report about scientific - investigated work 87 pages, figers - 14, tables - 18, references - 93. Objects of investigation - polypropylene/copolyamide (PP/CPA) mixtures with component ratios 20/80; 30/70; 40/60 wt.% and mixtures modified by additives of nanosize silicas; nanofilled microfibers and filter materials (FM) obtained by their processing. Content of silicas is 0,5; 1,0; 3,0; 5,0 wt.%. The aim of this work is investigation of the additive silicas influence with various chemical nature of particle surface and value of the specific surface on structureformation processes in PP/CPA mixture melts and on properties of nanofilled PP microfibers and FM. The method of investigation: capillary viscometry, differential thermal analysis, IR-spectroscopy, light and electron microscopy; the method of determining of FM efficiency, values of the specific surface and bactericidal properties of PP microfibers. It has been shown that a chemical nature of the functional groups and value of the silica specific surface influence on rheological processes of PP/CPA mixture melts. The generally known of regularities about filled systems are not fulfilled for PP/CPA/silica mixtures. It is confirmed by falling of melt viscosity under shearing and sharp increasing of spinning for the expense of realization of the specific interactions between silica sylanol groups with each other and with functional groups of CPA macromolecules. The latter allows to form the modified composite threads and films with help of the traditional extrusion equipment. It has been shown that nanosize silica particles do not prevent the forming of PP streams in CPA matrix. The phenomenon of the specific fiberforming realizes at addition of all investigated silicas. The mechanism of nanoadditive action on realization of the specific fiberforming phenomenon has been proposed. Accordingly to this mechanism introduction of filler nanoparticles prevents the growth of disturbance wave amplitude. Therefore the streams with considerably smaller diameters will be stable in the presence of the filler. The new thinfiber filters have developed which are characterized by high efficiency of filtration on particles less than one micron and high productivity. Bactericidal properties of developed filters surpass the analogous properties for nanodispersed silica. Product Description popup.authors Готфрід Антон Олександрович Данилова Галина Павлівна Коршун Алла Володимірівна Мельник Ірина Анатоліївна Резанова Наталія Михайлівна Цебренко Ірина Олександрівна Цебренко Марія Василівна popup.nrat_date 2020-04-02 Close