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APS » Journals » Phys. Rev. E » Volume 77 » Issue 4
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Phys. Rev. E 77, 041405 (2008) [4 pages]

Stripe formation in an immiscible polymer blend under electric and shear-flow fields

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Yang-Ho Na1, Tetsunori Shibuya2, Seiji Ujiie3, Tomoyuki Nagaya4, and Hiroshi Orihara1,*
1Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
2Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
3Department of Applied Chemistry, Faculty of Engineering, Oita University, Oita 870-1192, Japan
4Department of Electrical and Electronic Engineering, Faculty of Engineering, Oita University, Oita 870-1192, Japan

Received 11 November 2007; published 18 April 2008

We found a stripe formation in an emulsion of a liquid crystalline polymer (LCP) and a machine oil (OIL) in electric and shear fields. Through the simultaneous measurement with a confocal scanning laser microscope and a rheometer, it was clearly shown that the formation of stripes, which are periodically arrayed, leads to the increase of the shear stress. The droplets, which are one component of the emulsion, start to be connected at low electric fields and then change into the stripes with the increase of electric field. Finally, a three-dimensional network is formed at high electric fields. The period and fluctuation of the stripe structure were also investigated in detail.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevE.77.041405
DOI:
10.1103/PhysRevE.77.041405
PACS:
82.70.Kj, 83.10.Tv, 83.80.Tc

*Author to whom correspondence should be addressed; orihara@eng.hokudai.ac.jp

 
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