Polyaniline microsphere encapsulated by poly(methyl methacrylate) and investigation of its electrorheological properties

• Published in: Colloid and polymer science Vol. 282; no. 2; pp. 198 - 202
• Main Authors: PARK, Sun Y, CHO, Min S, KIM, Chul A, CHOI, Hyoung J, JHON, Myung S
• Format: Journal Article
• Language: English
• Published: Berlin Springer 01.12.2003; Springer Nature B.V
• Subjects: Applied sciences; Emulsion polymerization; Encapsulation; Exact sciences and technology; Microspheres; Organic polymers; Physicochemistry of polymers; Polyanilines; Polymerization; Polymers with particular properties; Polymethyl methacrylates; Preparation, kinetics, thermodynamics, mechanism and catalysts; Scanning electron microscopy; Shells; Spectrum analysis; Thermogravimetric analysis; Encapsulation; Silicone oil; Methyl methacrylate polymer; Poly(methyl methacrylate); Suspension; Particle suspension; Experimental study; Polyaniline; Thermal stability; Electrorheology; Conducting polymers; Free radical polymerization; Electrorheological fluid Microsphere; Preparation; Electrorheological fluid; Coated particle; Oxidative polymerization; Electric field effect; Suspension polymerization; Aniline polymer; Successive reaction
• ISSN: 0303-402X; 1435-1536
• DOI: 10.1007/s00396-003-0998-7

Microspheres consisting of a poly(methyl methacrylate) (PMMA) shell wrapping the conductive polyaniline (PANI) particle as a core were prepared by an in-situ suspension polymerization method and then adopted as an electrorheological (ER) material. The polymerization reaction and encapsulation were confirmed by Fourier transform infrared spectrum analysis. The rod-like PANI particles were synthesized via an emulsion polymerization protocol and observed by transmission electron microscopy. In addition, a spherical shape of encapsulated PANI/PMMA (core/shell) microspheres was observed by scanning electron microscopy. The thermal stability of PANI/PMMA particles was examined by use of thermogravimetric analysis. The PANI/PMMA particle-based suspension in silicone oil exhibited typical ER behavior. The conductivity of PANI/PMMA particles was much lower than that of the rod-like PANI.[PUBLICATION ABSTRACT]