Dewetting behavior of a block copolymer/homopolymer thin film on an immiscible homopolymer substrate

Langmuir : the ACS Journal of Surfaces and Colloids
Bin WeiRichard J Spontak

Abstract

Numerous previous studies have established that the addition of a microphase-ordered AB diblock copolymer to a thin homopolymer A (hA) film can slow, if not altogether prevent, film rupture and subsequent film dewetting on a hard substrate such as silica. However, only a few reports have examined comparable phenomena when the hA/AB blend resides on a soft B-selective surface, such as homopolymer B (hB). In this work, the dewetting kinetics of thin films composed of polystyrene (PS) and a symmetric poly(styrene-b-methyl methacrylate) (SM) diblock copolymer on a poly(methyl methacrylate) substrate is investigated by hot-stage light microscopy. Without the SM copolymer, the dewetting rate of the PS layer is constant under isothermal conditions and exhibits Arrhenius behavior with an apparent activation energy of approximately 180 kJ/mol. Addition of the copolymer promotes a crossover from early- to late-stage dewetting kinetics, as evidenced by measurably different dewetting rates. Transmission electron microscopy reveals the morphological characteristics of dewetted PS/SM films as functions of film thickness and SM concentration.

References

Jan 8, 1999·Journal of Colloid and Interface Science·L W HamleyC Booth
Feb 11, 1991·Physical Review Letters·C RedonF Rondelez
Feb 12, 1996·Physical Review Letters·P LambooyG Krausch
May 15, 2002·Physical Review Letters·Jean-Loup Masson, Peter F Green

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Citations

Sep 11, 2007·The Journal of Chemical Physics·Jianhui SongLijia An
May 3, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Nao HosakaAtsushi Takahara
Sep 27, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Xiao-Jing CaiRichard J Spontak
Oct 4, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Bin WeiRichard J Spontak

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