Despite the vast amount of studies based on magnetorheological elastomers (MREs), a very limited number of investigations have been initiated on their reprocessing. This paper presents a new type of recyclable MRE which is composed of thermoplastic polyurethane (TPU) and carbonyl iron particles (CI). The chosen TPU can be processed using injection moulding (IM), followed by several reprocessing cycles while preserving its properties. Numerous types of injection moulded and reprocessed MREs have been prepared for various particle concentrations. The effect of thermo-mechanical degradation on the recycled MREs has been investigated while simulating the reprocessing procedure. An apparent decrease in molecular weight was observed for all the examined matrices during the reprocessing cycles. These changes are attributed to the intermolecular bonding between the hydroxyl groups on the surface of the CI particles and the matrix which is studied in depth. The effect of reprocessing and the presence of magnetic particles is evaluated via tensile test, magnetorheology and piezoresistivity. These characterization techniques prove that the properties of our MREs are preserved at an acceptable level despite using 100% of recyclates while in real applications only up to 30% of recycled material is generally used.

Centre of Polymer Systems University Institute Tomas Bata University in Zlín Trida T Bati 5678 760 01 Zlín Czech Republic

Department of Production Engineering Faculty of Technology Tomas Bata University in Zlín Vavreckova 275 760 01 Zlín Czech Republic

Engineering Materials and Structures Universiti Teknologi Malaysia Jalan Sultan Yahya Petra 54100 Kuala Lumpur Malaysia

Institute of Polymer Science Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria

Polymer Centre Faculty of Technology Tomas Bata University in Zlín Vavreckova 275 760 01 Zlín Czech Republic

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