Stabilizace PEO nanovláken proti rozpouštění
Title Alternative:Crosslinking PEO nanofibres
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Date
2007
Authors
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Publisher
Technická Univerzita v Liberci
Abstract
Diplomová práce se zabývá síťováním polyethylenoxidu (PEO) ve formě filmů a nanovláken vlivem ultrafialového (UV) záření. Smyslem prezentované práce bylo hledání nejvhodnějších typů fotoiniciátorů, jejich koncentrace a dále vhodných organických rozpouštědel. Optimální podmínky vlastního ozařování: čas ozáření, atmosféra a vzdálenost zdroje záření od materiálů. Optimální podmínky byly posuzovány podle stupně rozpustnosti nanovlákenné vrstvy v destilované vodě tak, aby vzorky byly ve vodě zcela nerozpustné, pouze botnaly. Hodnocení stability nanovláken po expozici ve vodě bylo také prováděno pomocí elektronového mikroskopu.
This graduation paper focuses on cross-linking film-formed polyethylenoxide (PEO) and nanofibres through ultraviolet (UV) radiation. The paper was written in search of the most suitable type of photochemical initiators, the concentration there of and suitable organic dissolvents. Further, the work aims at identifying the conditions of the irradiation it self, distance between the radiation source and the processed material and atmospheric conditions during the irradiation. The optimum conditions were evaluated according to the level of solvability in distilled water. It was stated that the ideal cross-linking conditions were those where the samples were completely indissoluble in water. It is to say that they were merely swelling. Nanofibres stability after their immersion in water was also assessed with an electron microscope.
This graduation paper focuses on cross-linking film-formed polyethylenoxide (PEO) and nanofibres through ultraviolet (UV) radiation. The paper was written in search of the most suitable type of photochemical initiators, the concentration there of and suitable organic dissolvents. Further, the work aims at identifying the conditions of the irradiation it self, distance between the radiation source and the processed material and atmospheric conditions during the irradiation. The optimum conditions were evaluated according to the level of solvability in distilled water. It was stated that the ideal cross-linking conditions were those where the samples were completely indissoluble in water. It is to say that they were merely swelling. Nanofibres stability after their immersion in water was also assessed with an electron microscope.
Description
katedra: KNT; přílohy: 1 CD; rozsah: 40-60
Subject(s)
síťování, uv záření, fotoiniciátor, nanovlákna, cross-linking, ultraviolet (uv) radiation, photochemical initiators, nanofibres