Thermoplastic Starch–Based Composite Reinforced by Conductive Filler Networks: Physical Properties and Electrical Conductivity Changes during Cyclic Deformation
| Autor: | Ivan Chodák, Hamed Peidayesh, Zdenko Špitalský, Abolfazl Heydari, Alena Opálková Šišková, Katarína Mosnáčková |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Thermoplastic Polymers and Plastics carbon black electrical conductivity mechanical deformation Organic chemistry Percolation threshold General Chemistry Carbon black Conductivity conductive polymer composite Article Stress (mechanics) QD241-441 chemistry thermoplastic starch Ultimate tensile strength Deformation (engineering) Composite material Electrical conductor |
| Zdroj: | Polymers Volume 13 Issue 21 Polymers, Vol 13, Iss 3819, p 3819 (2021) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym13213819 |
| Popis: | Conductive polymer composites (CPC) from renewable resources exhibit many interesting characteristics due to their biodegradability and conductivity changes under mechanical, thermal, chemical, or electrical stress. This study is focused on investigating the physical properties of electroconductive thermoplastic starch (TPS)–based composites and changes in electroconductive paths during cyclic deformation. TPS–based composites filled with various carbon black (CB) contents were prepared through melt processing. The electrical conductivity and physicochemical properties of TPS–CB composites, including mechanical properties and rheological behavior, were evaluated. With increasing CB content, the tensile strength and Young’s modulus were found to increase substantially. We found a percolation threshold for the CB loading of approximately 5.5 wt% based on the rheology and electrical conductivity. To observe the changing structure of the conductive CB paths during cyclic deformation, both the electrical conductivity and mechanical properties were recorded in parallel using online measurements. Moreover, the instant electrical conductivity measured online during mechanical deformation of the materials was taken as the parameter indirectly describing the structure of the conductive CB network. The electrical conductivity was found to increase during five runs of repeated cyclic mechanical deformations to constant deformation below strain at break, indicating good recovery of conductive paths and their new formation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |