Příprava a charakteristika polyesterových orientovaných vláken metodou drawing
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Technologie drawing je založena na výrobě jednotlivých mikro až nanovláken, což má velký potenciál zejména pro tkáňové inženýrství, kdy je možné vyrábět vlákenné nosiče s přesně definovanou strukturou. Tato práce je zaměřena na přípravu vláken tažených metodou drawing a optimalizaci výrobního procesu. V rámci experimentální části práce byl sledován vliv homogenizace polymerního roztoku na výrobní proces vláken. Pro přípravu roztoků a následnou výrobu vláken byly použity polymery polykaprolakton (PCL) a kopolymer polykaprolaktonu a kyseliny polymléčné (PLCL). Homogenizace roztoku byla experimentálně zjišťována pomocí viskozity a následné morfologie vyrobených vláken. Z jednotlivých roztoků byly v rámci optimalizace testovány i mechanické vlastnosti vlákenných svazků. Z výsledků vyplývá, že s rostoucím intervalem homogenizace polymerního roztoku se průměry vláken více přibližují Gaussovu rozdělení a jejich rozptyl se snižuje. Dále byla práce zaměřena na jednu z možných modifikací výroby vláken metodou drawing. Konkrétně na tažení vláken z volné hladiny polymerního roztoku popřípadě taveniny místo z polymerní kapky. Vlákna vyrobená jednotlivými metodami byla následně morfologicky porovnána, kdy nejvyšší homogenitu po délce vykazovala vlákna tažená z volné hladiny polymerní taveniny.
The drawing technology is based on the production of individual micro even nanofibers, which has great potential mainly for the tissue engineering, when it is possible to produce fiber scaffold with an accurately defined structure. This thesis is focused on preparation fibers by method called drawing and optimalization fiber production process.In frame of the experimental part of this thesis there was monitored an influence of homogenisation the polymer solution on the production process of fibers. For the preparation of the solution and resulting fiber production there were used polycaprolactone (PCL) polymer and polycaprolactone and polylactic acid (PLCL) copolymer. Homogenization of the solution was experimentally determined with help of viscosity and subsequent morphology of the produced fibers. From the individual solutions there were in frame of the optimisation tested also the mechanical characteristics of fibers bundle. The results show, that in connection with a growing interim of homogenisation of polymer solution the fibers diameters approaching more closer of the Gaussian distribution and their scattering decreases.Further, the thesis was focused on one of the possible modification in fiber production used by method drawing. The modification was specifically, of the draw the fibers from the free surface of the polymer solution or melt instead of a polymer droplet. The fibers produced by the individual methods were then morphologically compared, when the highest homogeneity along the length of the fibers drawn from the free-flowing polymer melt.
The drawing technology is based on the production of individual micro even nanofibers, which has great potential mainly for the tissue engineering, when it is possible to produce fiber scaffold with an accurately defined structure. This thesis is focused on preparation fibers by method called drawing and optimalization fiber production process.In frame of the experimental part of this thesis there was monitored an influence of homogenisation the polymer solution on the production process of fibers. For the preparation of the solution and resulting fiber production there were used polycaprolactone (PCL) polymer and polycaprolactone and polylactic acid (PLCL) copolymer. Homogenization of the solution was experimentally determined with help of viscosity and subsequent morphology of the produced fibers. From the individual solutions there were in frame of the optimisation tested also the mechanical characteristics of fibers bundle. The results show, that in connection with a growing interim of homogenisation of polymer solution the fibers diameters approaching more closer of the Gaussian distribution and their scattering decreases.Further, the thesis was focused on one of the possible modification in fiber production used by method drawing. The modification was specifically, of the draw the fibers from the free surface of the polymer solution or melt instead of a polymer droplet. The fibers produced by the individual methods were then morphologically compared, when the highest homogeneity along the length of the fibers drawn from the free-flowing polymer melt.
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Drawing, polykaprolakton, poly(laktid-co--kaprolakton), morfologie vláken, viskozita, mechanické vlastnosti vláken, tkáňové inženýrství, vlákenný nosič (scaffold), Drawing, polycaprolactone, polycaprolactone, poly (lactide-co-caprolactone), fiber morphology, viscosity, mechanical characteristic of fibers, tissue engineering, scaffold