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Enhanced dielectric and electrorheological properties of needle‐like T i O 2 /polyrhodanine core/shell hybrid nanostructure
Author(s) -
Ozkan Seyma,
Unal Halil Ibrahim
Publication year - 2016
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.43240
Subject(s) - electrorheological fluid , materials science , viscoelasticity , dielectric , composite material , creep , polarizability , silicone oil , electric field , dielectric loss , shear modulus , chemistry , physics , optoelectronics , organic chemistry , quantum mechanics , molecule
In this study, antisedimentation, dielectric, electrorheological (ER) and creep–recovery properties of needle‐like TiO 2 /polyrhodanine (PRh) nanocomposite were investigated. Antisedimentation ratio of needle‐like TiO 2 /PRh was determined to be 45% after 30 days in silicone oil (SO). Polarizability and relaxation time of needle‐like TiO 2 /PRh/SO system were determined to be 0.18 and 2.9 × 10 −5 s, respectively by the dielectric spectroscopy which was further used to evaluate the ER performance of the dispersion, and the data obtained were in good agreement with the overall ER results. ER properties of needle‐like TiO 2 /PRh/SO system were determined by taking the effects of shear rate, shear stress, electric field strength, and temperature into account using a torque electrorheometer. Non‐Newtonian shear thinning behaviors were observed for the samples. Vibration damping capabilities of the dispersions were investigated by measuring their elastic and viscous moduli as functions of frequency, time, and electric field strengths. Enhanced and reversible viscoelastic deformations were recorded for needle‐like TiO 2 /SO system from creep–recovery tests with 88% recovery under E = 3.5 kV mm −1 condition; thus, the system was classified as a smart one and suitable for potential vibration damping applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43240.