The European Physical Journal E

, Volume 29, Issue 2, pp 239–244 | Cite as

Spreading of diblock copolymer droplets: A probe of polymer micro-rheology

Regular Article

Abstract

We present an experimental study of the spreading dynamics of symmetric diblock copolymer droplets above and below the order-disorder transition. Disordered diblock droplets are found to spread as a homopolymer and follow Tanner’s law (the radius grows as Rtm , where t is time and m = 1/10 . However, droplets that are in the ordered phase are found to be frustrated by the imposed lamellar microstructure. This frustration is likely at the root of the observed deviation from Tanner’s law: droplet spreading has a much slower power law ( m ∼ 0.05±0.01 . We show that the different spreading dynamics can be reconciled with conventional theory if a strain-rate-dependent viscosity is taken into account.

PACS

83.80.Uv Block copolymers 68.08.Bc Wetting 82.35.Gh Polymers on surfaces; adhesion 47.55.D- Drops and bubbles 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Department of Physics & Astronomy and the Brockhouse Institute for Materials ResearchMcMaster UniversityHamiltonCanada

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