title: Monodisperse poly(2-methylaniline) coated polystyrene core-shell microspheres fabricated by controlled releasing process and their electrorheological stimuli-response under electric fields.
abstract: A core-shell structured electro-responsive electrorheological (ER) particle system comprised of monodisperse poly(2-methylaniline)-coated polystyrene (PS/PMAN) microspheres was fabricated by applying a controlled swelling-releasing technique to pre-fabricated micron-sized PS seeds using a dispersion polymerization method. Compact wrapping of the PS microparticles with semiconducting PMAN without a de-doping process was examined by scanning electron microscopy and transmission electron microscopy. Fourier-transform infrared spectroscopy and thermogravimetric analysis also confirmed the chemical composition and thermal stability of the particles, respectively. Rheological characteristics of the PS/PMAN microsphere based ER fluid dispersed in silicone oil at various electric field strengths revealed a typical ER response under both steady shear flow and dynamic oscillation, demonstrating its mechanism of a conductivity model with a slope of 1.5.
authors.affiliation: Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea.
authors.forename: Seung Hyuk
authors.initials: SH
authors.lastname: Kwon
authors.affiliation: Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea; State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
authors.forename: Ying Dan
authors.initials: YD
authors.lastname: Liu
authors.affiliation: Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea. Electronic address: hjchoi@inha.ac.kr.
authors.forename: Hyoung Jin
authors.initials: HJ
authors.lastname: Choi
keywords: Controlled swelling-releasing; Dispersion polymerization; Electrorheological; Methylaniline; Microsphere; Polystyrene