20.500.12556/RUL-155358 Mathematical model for characterization of temperature-responsive polymers a study on the rheological behavior of gelatin and poly(N-isopropylacrylamide) This study introduces a mathematical model for detailed characterization of temperature-responsive polymers, focusing on critical temperature, viscosity, storage modulus, their rate of change in the transition region, flow behavior, and potential hysteresis. Applied to gelatin (GEL) and poly(N-isopropylacrylamide) (pNIPAm), the model analyzes their rheological responses across various temperatures. It was observed that gel's critical temperature is slightly above its polymer's lower critical solution temperature, and vice versa for upper critical solution temperature polymers. The critical temperature for GEL was 28 °C, as opposed to 37 °C for pNIPAm. While concentration changes affected these values, the contribution of tetramethylethylenediamine (typically used in combination with various initiators to start the polymerization reaction) was found to be insignificant. GEL exhibited significant hysteresis, unlike pNIPAm's rapid transition. Their storage modulus and viscosity showed a linear correlation with concentration, with deviations at high pNIPAm concentrations suggesting the influence of polymer interactions and crosslinking. These findings offer valuable insights for applications requiring temperature sensitivity. temperature responsive polymers hydrogels rheological characterization viscosity behavior sol-gel transition temperaturno odzivni polimeri hidrogeli reološka karakterizacija viskozni odziv prehod raztopina-gel true false true Angleški jezik Slovenski jezik Članek v reviji 2024-03-27 14:40:20 2024-03-27 14:40:21 2025-02-01 04:06:23 0000-00-00 00:00:00 2024 0 0 10 str. Vol. 133, art. 108402 Apr. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 678:532.135 0142-9418 10.1016/j.polymertesting.2024.108402 190582019 1-s2.0-S0142941824000795-main.pdf 1-s2.0-S0142941824000795-main.pdf 1 BB50EBEE981B6F7B5A8DC266FD06065C aba17606ed2bdc27967c9e0e66693cfc056ffb7ca72275029ac5c57df51f089e 67b34877-dfa7-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198991 https://www.sciencedirect.com/science/article/pii/S0142941824000795 1 8e2340e6-ec3f-11ee-aa14-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182205 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0