Reološke lastnosti temperaturno odzivnih hidrogelov na osnovi poli(N-izopropilakrilamida)

Florjančič, Meta (author), Kopač, Tilen (mentor)

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.

• Language: Slovenian
• Keywords: PNIPAm, temperaturno odzivni polimeri, reološke lastnosti, hidrogel
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2024
• PID: 20.500.12556/RUL-160963
• COBISS.SI-ID: 212802819
• Publication date in RUL: 06.09.2024

FLORJANČIČ, Meta, 2024, Reološke lastnosti temperaturno odzivnih hidrogelov na osnovi poli(N-izopropilakrilamida) [online]. Bachelor’s thesis. [Accessed 11 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=160963

Secondary language

• Language: English
• Title: Rheological properties of temperature responsive hydrogels based on poly(N-isopropylacrylamide)

Abstract

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.

• Keywords: PNIPAm, temperature responsive polymers, rheological properties, hydrogel