20.500.12556/RUL-160963 Reološke lastnosti temperaturno odzivnih hidrogelov na osnovi poli(N-izopropilakrilamida) Rheological properties of temperature responsive hydrogels based on poly(N-isopropylacrylamide) Hidrogeli spadajo v skupino tridimenzionalnih polimernih materialov, ki lahko nabreknejo ali se skrčijo. Med njihove podskupine spadajo temperaturno odzivni hidrogeli, ki se spreminjajo glede na temperaturo, kar se odraža v njihovih mehanskih lastnostih (strižni modul, gostota zamreženja, velikost hidrogelne mreže) in tokovnih lastnostih (viskoznost in kritična napetost). V diplomski nalogi sem preučevala mehanizem temperaturno odzivnih hidrogelov (TOH) na osnovi poli(N-izopropilakrilamida) (PNIPAm). Osredotočila sem se na reološko karakterizacijo mehanskih lastnosti PNIPAm v odvisnosti od temperature. Vzorce sem pripravila s šaržno polimerizacijo NIPAm, pri čemer sem spreminjala koncentracijo polimera in sredstva za iniciacijo, N,N,N',N'-tetrametiletilendiamin (TEMED), kar je vodilo k pripravi temperaturno odzivnih hidrogelov z želenimi lastnostmi. Reološke meritve so pokazale, da tako količina TEMED kot koncentracija PNIPAm vplivata na strukturo, mehanske in tokovne lastnosti hidrogela. Hydrogels belong to the group of three-dimensional polymer materials that can swell or shrink. Their subgroups include temperature-responsive hydrogels, which change in response to temperature, reflected in their mechanical properties (shear modulus, cross-linking density, network size) and flow properties (viscosity and critical stress). In my thesis, I studied the mechanism of thermoresponsive hydrogels (TRH) based on poly(N-isopropylacrylamide) (PNIPAm) in detail. I focused on the rheological characterization of the mechanical properties of PNIPAm as a function of temperature. I prepared the samples using batch polymerization of NIPAm, varying the concentration of the polymer and the initiator, N,N,N',N'-tetramethylethylenediamine (TEMED), which led to the preparation of temperature-responsive hydrogels with the desired properties. Rheological measurements showed that both the amount of TEMED and the concentration of PNIPAm affect the structure, mechanical, and flow properties of the hydrogel. PNIPAm temperaturno odzivni polimeri reološke lastnosti hidrogel PNIPAm temperature responsive polymers rheological properties hydrogel true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-09-06 07:45:00 2024-09-06 07:45:03 2024-10-24 10:55:56 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 22987 212802819 Florjancic_Meta_-_Reoloske_lastnosti_temperaturno_odzivnih_hidrogelov_na_osnovi_poli(N-izopropil.pdf Florjancic_Meta_-_Reoloske_lastnosti_temperaturno_odzivnih_hidrogelov_na_osnovi_poli(N-izopropil.pdf 1 2318E519B15625693782C3414AA97BB1 1c278e6a61d35fc1b1d4ee263d5326a72d2b17164e24f9707aab5e990b4f02c0 25009dd0-6c13-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189796 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0