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Information × Registration Number 0214U003141, 0111U000308 , R & D reports Title Рhysico-chemical mechanisms producing microfibers with antibacterial properties popup.stage_title Head Tsebrenko Marya Vasilyevna, Registration Date 21-01-2014 Organization Kiev national university of technology and design popup.description2 Object of investigation - binary polypropylene/copoliamide (PP/CPA) mixtures with ratio of components 30/70 wt. % modified by complex 30/70 wt. % ; modified by complex bactericidal metalcontent nanoadditives Ag/SiO2, Ag/Al2O3, microfibers, threads and filter materials (FM). Content of nanoadditives is (0,05 - 3,0) wt.% from PP mass. Revealing of the influence mechanism of metal nanoadditives on micro- and macrorheological process of PP/CPA mixture melts and properties of PP microfibers and filter materials their basis is aim of work. Capillary viscometry, IR-spectroscopy, electron and light microscopy, methods of founding of the nanoparticles sizes, deficiency and productivity, specific surface FM bactericidal properties, mechanical characteristic of mono and complex threads were the methods of investigations. At the first time physical-chemical features in fill by nanosize complex additives Ag/SiO2, Ag/Al2O3 PP/CPA mixture melts under their processes in products (microfibers, threads, filters) have been studied. It has been shown that these nanoadditives in spite of their hard state do not prevent PP forming in the CPA matrix, but improve it. Under PP/CPA mixture melts flowing this is confirmed by decreasing of PP microfibers diameters, increasing of their weight part and decreasing of other type structures. The work hypothesis about stabilized influence of nanoadditives on liquid PP streams has been confirmed. This is explained by liquid streams in the presence of nanoadditives. This is explained by suppression of the disturbance wave amplitude growth. Nanoadditives which are situated on the interface surface essentially decrease the interfacial tension. Thus as a result of investigation the mechanism of influence of Ag/SiO2 and Ag/Al2O3 additives on phenomenal of specific fibers formation has been found. New method of polymers and nanoadditives mixing has been claborated. At the first time features of the rheological properties of PP/CPA mixture melts filled by Ag/SiO2, Ag/Al2O3 additives have been determined. The melt viscosity, spinnability elasticity melt increase. This is explained by filling effect. The nanoadditives are dispersed in mixture melt to nanosizes. It is confirmed by reflection spectrums for extrudates and the nanofilled microfibers. It has been shown that Ag/SiO2, Ag/Al2O3, nanoaddditives influence on phase transition in PP/CPA mixtures. The additive Ag/SiO2 is more effective that additive Ag/SiO2 at Ag/Al2O3 content 0,5 wt. % interfacial tension decrease to 0,21 mN/m against the binary mixture. It has for shown that introduction in PP/CPA/ Ag/SiO2 mixture oleate sodium prevents of aggregation of Ag/SiO2 particles and increase the kinetic stability of mixture melt.t the first time surgical suture bactericidal material on the basis of nanofilled by Ag/SiO2 additives has been elaborated. Polypropylene microfibers nanofilled, by Ag/SiO2 have been obtained. They have higher (in 2,8 times) specific surface in comparison with one for microfibers from initial PP/CPA mixture. New bactericidal filter material on the basis of nanofilled PP threads has been elaborated. Product Description popup.authors Данилова Галина Павлівна Коршун Алла Володиміровна Мельник Ірина Анатоліївна Резанова Наталія Михайлівна Цебренко Ірина Олександрівна popup.nrat_date 2020-04-02 Close