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Microstructure and viscoelasticity of electrorheological suspensions with hybrid core‐shell microspheres
Author(s) -
KrztonMaziopa Anna,
Oratowska Joanna,
Zukowska Grazyna,
Plocharski Janusz
Publication year - 2018
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4360
Subject(s) - materials science , microstructure , electrorheological fluid , composite material , viscoelasticity , electric field , rheology , electrolyte , polyurethane , electrode , chemistry , physics , quantum mechanics
A novel type of electrorheological (ER) fluids with hybrid microspheres as dispersed phases was prepared and their rheological properties in dynamic and oscillatory modes in the presence of electric field were studied. Hybrid microspheres are new types of inorganic‐organic composites consisting of inorganic hollow cores covered with a thin layer of conjugated polymer poly (3‐octylthiophene)—P 3 OT, followed by a polyurethane electrolyte shell of defined thicknesses and controlled (electronic and ionic) conductivities. It has been found that the rate of ER response for the applied electric field of the order of few kV/mm, as well as the recovery time after high shear loads of the novel ER fluids, was significantly improved in comparison to the typical solid electrolyte‐based materials. It has been shown that upon the application of an electric field the suspensions of hybrid microspheres form a gel‐like network structure at low strain region with reasonable rigidity characterized by the domination of G′ moduli over G″ and broad linear viscoelastic range. It was shown that at electric fields as high as 3 kV/mm, the investigated ER materials exhibited predominantly elastic behavior and were able to endure strains up to 3% without significant deformation of the material microstructure. Moreover, the novel ER materials exhibited much faster microstructure recovery after high shear loads in comparison to ER fluids comprising core‐shell composites without poly (3‐octylthiophene) interlayer, which makes them more suitable for the applications requiring immediate response to an external electric field.