Self-Healing and Electrical Properties of Viscoelastic Polymer-Carbon Blends

Titelangaben

Milkin, Pavel ; Danzer, Michael A. ; Ionov, Leonid:
Self-Healing and Electrical Properties of Viscoelastic Polymer-Carbon Blends.
In: Macromolecular Rapid Communications. Bd. 43 (2022) Heft 19 . - No. 2200307.
ISSN 1521-3927
DOI der Verlagsversion: https://doi.org/10.1002/marc.202200307

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Abstract

Self-healing polymer-carbon composites are seen as promising materials for future electronic devices, which must be able to restore not only their structural integrity but also electrical performance after cracking and wear. Despite multiple reports about self-healing conductive elements, there is a lack of a broad fundamental understanding of correlation between viscoelasticity of such composites, their electrical properties, and self-healing of their mechanical as well as electrical properties. Here we report thorough investigation of electromechanical properties of blends of carbon black as conductive filler and viscoelastic polymers (polydimethylsiloxanes and polyborosiloxane) with different relaxation times as matrices. We show that behavior of composites depends strongly on the viscoelastic properties of polymers. Low molecular polymer composite possesses high conductivity due to strong filler network formation, quick electrical and mechanical properties restoration, but for this we sacrifice the ability to flow and ductility at large deformation (material is brittle). In contrary, high relaxation time polymer composite behaves elastically on small time and flows at large time scale due to weak filler network and can heal. However, the electrical properties are worse than that of carbon and viscous polymer and degrade with time.