20.500.12556/DKUM-12080 PRIPRAVA NANOKOMPOZITNE MEMBRANE PREPARATION OF NANOCOMPOSITE MEMBRANES Nanokompozitna membrana je bila pripravljena z UV fotopolimerizacijo Nisopropilakrilamida v pore porozne, hidrofobne polipropilenske membrane. V hidrogelno matriko smo vgradili še organsko modificiran plasteni silikat Montmorilonit (Nanofil 8). Hidrofobni Nanofil 8 smo dispergirali v vodni disperziji s pomocjo površinsko aktivnega sredstva (PAS) Inutec SP1. Najbolj stabilno disperzijo smo dobili pri uporabi 1g/L PAS. Stabilnost disperzije smo dolocili z merjenjem posedanja delcev s turbidimetrom. Gele smo pripravili z razlicnimi koncentracijami zamreževalca in dolocili kot najprimernejšo koncentracijo zamreževalca med 0,3 in 0,5 g v 20 mL topila Kot najucinkovitejša predpriprava polipropilenske membrane se je izkazala eno urna obdelava v acetonu in prenos še mokre membrane v raztopino monomera. S polimerizacijo hidrogela z vgrajenimi delci Nanofil 8 so se spremenile površinske lastnosti polipropilenske membrane. Pore membrane so se napolnile z nanokompozitnim hidrogelom, porozna struktura membrane pa se je ohranila. Nanocomposite membrane was prepared by UV photopolymerization of Nisopropylacrylamide on the surface of porous hydrophobic polypropylene membrane. Particles of organically modified layered silicates (Montmorilonite (Nanofil 8)) were incorporated into the hydrogel matrix. Aqueous dispersion of hydrophobic Nanofil 8 particles was achieved with addition of surfactant Inutec SP1; 1 g/L of surfactant proved to be the most appropriate concentration, which was determined by measurement of particles’ sedimentation rate. The most suitable concentration of crosslinker, needed for the formation of hydrogel, was determined by varying different amounts of crosslinker and by comparison of resultant hydrogels’ properties; optimal amount of crosslinker ranges between 0,3 and 0,5 g in 20 mL of solvent. Optimal procedure for formation of nanocomposite membrane consists of pretreatment of membrane in acetone and then subsequent impregnation of a wet membrane in the solution of monomer. After the UV polymerization of the hydrogel inside the pores of the polypropylene membrane, altered surface properties of the membrane were achieved. Pores were filled with nanocomposite hydrogel, however, a porous structure of the original membrane is preserved. nanokompozit hidrogel plasteni silikati nanocomposites hydrogel layerd silicates true true false [A. Šegula] Slovenski jezik Angleški jezik Diplomsko delo 2009-10-04 13:05:38 2009-10-07 07:50:36 2022-04-12 07:12:03 2022-04-19 03:11:11 2009 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.3:66.081(043.2) 13740054 URN:SI:UM:DK:MM47WXK8 UNI_Segula_Adrijana_2009.pdf UNI_Segula_Adrijana_2009.pdf 1 C0DFE33E34789F80E06B8E09F80BEDB7 0bdf6501528b161e49546a394f1fa978c4a9c6a3a54496b9108929ad41f280cf 4f56f06f-7c03-11eb-bb7a-00155d0001ca 20.500.12556/dkum/a9a98829-86a3-4dc0-8352-a4f4eecfb042 https://dk.um.si/Dokument.php?lang=slv&id=11212 Fakulteta za strojništvo 0 0 0