Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Composites and Functional Polymer Hybrids I

CPP 6.1: Hauptvortrag

Montag, 18. März 2024, 11:30–12:00, H 0106

Stretchable, redispersible, recyclable: reversible interfaces for electrically conductive hybrids and composites — •Tobias Kraus — INM - Leibniz-Institute for New Materials, Saarbrücken, Germany — Saarland University, Colloid and Interface Chemistry, Saarbrücken, Germany

Composites and hybrids with organic polymer and inorganic particle components are indispensable for modern products. This talk focuses on electrically conductive hybrids and composites. We study their structure and internal interfaces to make them reversibly stretchable, enable repair, and simplify their recycling. Reversible interfaces provide functional connections that can be released with a stimulus, for example when components must be separated at the end of product lifetime. I will first discuss fundamental results on the redispersion of agglomerated particles at different length scales. Particle de-agglomeration in water and non-polar organic solvents is introduced. Reversibility at the nanometer scale is then discussed for the case of printed electronics. Inks based on hybrid particles with metal cores and ultrathin layers of conductive polymers were developed as sinter-free, inkjet-printable conductors. I will show that the particles can be re-dispersed and recovered to create new inks at the end of product lifetime. As an outlook, I will discuss the role of reversible interfaces in stretchable electronics. The 3D reconstruction of conductive networks using Focused Ion Beam-Scanning Electron Microscopy tomography and leads to first results on structure-property relations for piezoresistance and ageing after many cycles.

Keywords: Circular functional composites and hybrids; Reversible agglomeration; Conductive Polymer Composites; Recycling; Stretchable conductors