Mathematical model for characterization of temperature-responsive polymers : a study on the rheological behavior of gelatin and poly(N-isopropylacrylamide)

Kopač, Tilen (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: temperature responsive polymers, hydrogels, rheological characterization, viscosity behavior, sol-gel transition
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 10 str.
• Številčenje: Vol. 133, art.108402
• PID: 20.500.12556/RUL-155358
• UDK: 678:532.135
• ISSN pri članku: 0142-9418
• DOI: 10.1016/j.polymertesting.2024.108402
• COBISS.SI-ID: 190582019
• Datum objave v RUL: 27.03.2024

Gradivo je del revije

• Naslov: Polymer testing
• Skrajšan naslov: Polym. test.
• Založnik: Applied Science Publishers Ltd
• ISSN: 0142-9418
• COBISS.SI-ID: 26155008

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: temperaturno odzivni polimeri, hidrogeli, reološka karakterizacija, viskozni odziv, prehod raztopina-gel

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0191
• Naslov: Kemijsko inženirstvo