SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Poster Session II

CPP 35.22: Poster

Mittwoch, 29. März 2023, 11:00–13:00, P1

Morphological studies in semicrystalline polymers and polymer nanocomposites using spin diffusion — •Dorit Hartmann, Anna Nitsche, Yury Golitsyn, Horst Schneider, and Kay Saalwächter — Department of Physics / NMR Group, University of Halle, Betty-Heimann-Str. 7, 06120 Halle, Germany

ABSTRACT: The properties of synthetic polymers can be selectively modified by adding nanoparticles, which is why polymer nanocomposites have a wide range of applications. The interaction of the polymer chains with the surface of silica particles leads to the formation of a multiphase structure, characterized by a gradient of molecular dynamics. [1] Studies of polymer nanocomposites using spin diffusion (SD) experiments in conjunction with the numerical simulations have shown that the interphases exhibit complex morphology with dynamic heterogeneities. [2] In this work, we investigate the effect of magnetic field strength on spin diffusion in semicrystalline poly(ε-caprolactone) and a poly(2-vinyl pyridine)-silica nanocomposite. The experiments were performed at two different field strengths of 0.47 T and 4.7 T (proton Larmor frequency of 20 MHz and 200 MHz, respectively) and were supported by spin diffusion calculations. In addition, this paper aims to provide an overview of the different data acquisition and analysis strategies for high- and low-field instruments. REFERENCES: [1] Horst Schneider, Kay Saalwächter, and Matthias Roos. Macromol. (2017), 50, 8598-8610. [2] Horst Schneider, Matthias Roos, Yury Golitsyn, Kerstin Steiner, and Kay Saalwächter. Macromol. Rapid Commun. (2021), 2100061.