Volltext-Downloads (blau) und Frontdoor-Views (grau)

Microscopic Softening Mechanisms of an Ionic Liquid Additive in an Electrically Conductive Carbon-Silicone Composite

  • The microstructural changes caused by the addition of the ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide to polydimethylsiloxane (PDMS) elastomer composites filled with carbon black (CB) are analyzed to explain the electrical, mechanical, rheological, and optical properties of IL-containing precursors and composites. Swelling experiments and optical analysis indicate a limited solubility of the IL in the PDMS matrix that reduces the cross-linking density of PDMS both globally and locally, which reduces the Young's moduli of the composites. A rheological analysis of the precursor mixture shows that the IL reduces the strength of carbon–carbon and carbon–PDMS interactions, thus lowering the filler–matrix coupling and increasing the elongation at break. Electromechanical testing reveals a combination of reversible and irreversible piezoresistive responses that is consistent with the presence of IL at microscopic carbon–carbon interfaces, where it enables re-established electrical connections after stress release but reduces the absolute conductivity.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar


Document Type:Article
Author:Long Zhang, Dominik S. Schmidt, Lola González-GarcíaORCiD, Tobias KrausORCiD
Parent Title (English):Advanced Materials Technologies
First Page:2101700
Date of first Publication:2022/06/16
Release Date:2022/08/22
Tag:carbon black; cross-linking density; elastomer nanocomposites; elastomers; flexible electrical conductors
Impact:08.856 (2021)
Funding Information:German Research Foundation. Grant Number: 404913146 European Union's Horizon 2020 research and innovation program. Grant Number: 949785 ELECTROFLUID
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2022/058
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International