Core-shell Microspheres of Polystyrene/Poly(2-methylaniline) with Controlled Surface Morphologies and their Electrorheology

Title:Core-shell Microspheres of Polystyrene/Poly(2-methylaniline) with Controlled Surface Morphologies and their Electrorheology

Volume: 2 Issue: 1

Author(s): Bo N. Hao, Yun X. Guo, Ying D. Liu*, Wenkang Tu, Li-Min Wang and Hyoung J. Choi*

Affiliation:

• State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei,China

• Department of Polymer Science and Engineering, Inha University, Incheon 402751,Korea

Keywords: Core-shell microsphere, electrorheological fluid, friction, sea urchin-like, surface roughness.

Abstract: Background: Recently, core-shell typed electrorheological particles have been developed and become a research focus. In this work, monodisperse polystyrene/poly(2-methylaniline) core-shell microspheres were prepared and the shell morphology were adjusted to either smooth or urchin-like. Therefore, the influence of surface morphology on electrorheological effect was studied by comparing the electrorheological properties of the two kinds of core-shell microspheres.

Methods: The surface morphology of microspheres was adjusted by using different initiators and the products were observed by scanning electron microscopy. Their electrorheological properties were tested by a rotational rheometer.

Results: Sea urchin-like shells can be obtained by using iron (III) nitrate nonahydrate as an initiator. While ammonium persulphate could generate a high density of polymerisation centres, and smooth surfaces can be readily formed. In the shear flow curves, the sea urchin-like particles showed much higher shear stress than the particles with smooth surface. In the dynamic sweep tests, the sea urchinlike particles exhibited broader linear viscoelastic region and higher storage moduli under electric field.

Conclusion: The low oxygen potential of the ferric salt leads to the growth of poly(2-methylaniline) nanofibres, while ammonium persulphate with a higher oxygen potential tends to form a smoother surface. The sea urchin-like polystyrene/poly(2-methylaniline) particles showed higher electrorheological properties. This indicates that the sea urchin-like particles can generate larger drag force and interparticle friction due to the rough surface and larger surface area of the sea urchin-like particles.

Cite this article as:

Hao N. Bo, Guo X. Yun , Liu D. Ying*, Tu Wenkang , Wang Li-Min and Choi J. Hyoung*, Core-shell Microspheres of Polystyrene/Poly(2-methylaniline) with Controlled Surface Morphologies and their Electrorheology, Current Smart Materials (Discontinued) 2017; 2 (1) . https://dx.doi.org/10.2174/2405465801666161018110309

DOI https://dx.doi.org/10.2174/2405465801666161018110309	Print ISSN 2405-4658
Publisher Name Bentham Science Publisher	Online ISSN 2405-4666