Citation: . RUPTURING OF POLYMER FILMS WITH RUBBING-INDUCED SURFACE DEFECTS*[J]. Chinese Journal of Polymer Science, ;2003, 21(2): 123-127. shu

RUPTURING OF POLYMER FILMS WITH RUBBING-INDUCED SURFACE DEFECTS*

Received Date: 9 July 2002

It has been a long-standing question whether dewetting of polymer film from non-wettable substrate surfaceswherein the bicontinuous morphology never forms in the dewetting film is due to spinodal instability or heterogeneousnucleation. In this experiment, we use a simple method to make the distinction through introduction of topographical defectsof the films by rubbing the sample surface with a rayon cloth. Spinodal dewetting is identified for those films that dewet by acharateristic wavevector, q*, independent of the density of rubbing-induced defects.Heterogeneous nucleation,on the other hand,is identified for those with q* increasing with increasing density of defects.Our result shows that PS films on oxide coated silicon with thickness less than ≈13 nm are dominated by spinodal dewetting,but the thicker films are dominated by nucleation dewetting.We also confirm that spinodal dewetting does not necessarily lead to a bicontinuous morphology in the dewetting film,contrary to the classic theory of Cahn.
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