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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster II

CPP 46.38: Poster

Donnerstag, 12. März 2026, 09:30–11:30, P5

Thermoresponsive Microgels with hydrophilic Monomers — •Stefanie Uredat¹, Aditi Gujare², Jonas Runge¹, Domenico Truzzolillo², Julian Oberdisse², and Thomas Hellweg¹ — ¹Physical and Biophysical Chemistry, University Bielefeld, Bielefeld, Germany — ²Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France.

To develop fully smart membranes for use in low-temperature fuel cells operating at around 80-90 °C it is essential to achieve a high volume phase transition temperature (VPTT) within this range. To reach these high VPTTs, new monomers are required for microgel synthesis. The most common and researched monomers have a VPTT around the human body temperature [1]. To rise the VPTT we increased the hydrophilicity of the monomers by adding a hydroxy group to the well-known NIPAM and got HIPAM (N-(2-hydroxyisopropyl)acrylamide).

To tune the VPTT to higher Temperatures a series of microgels with two different main monomers (NIPAM and NIPMAM) with different contents of HIPAM as comonomer were synthesised. The microgels were observed by Dynamic Light Scattering and AFM. With higher HIPAM content the VPTT of the microgels increases and widens. We also observe a jump in size with increasing hydrophilic monomer content. We also investigated a second hydrophilic monomer N-(hydroxymethyl)acrylamide (HMAM). [2]

[1] Uredat, Runge, Gujare, PCCP, 2024, 2732. [2] Gujare, Uredat, LANGMUIR 2025, 41, 45, 30442 [3] The authors acknowledge funding from the DFG (505656154) and ANR (ANR-22-CE92-0052-01)

Keywords: thermoresponsive mircogels; high VPTT; hydrophilic monomers; Dynamic Light Scattering; Atomic Force Microscopy