Dewetting of Thin Block Copolymer Films.
The dewetting of thin films of low molecular weight diblock and triblock copolymers of poly(oxyethylene)/poly(oxybutylene) on silicon has been studied using video microscopy and X-ray reflectivity. Dewetted films were observed to comprise polygonal domains of polymer droplets, with a domain size of several millimeters. The dewetted films were studied using X-ray reflectivity, which showed that a film of polymer <50 Å thick remains on the substrate at the same time as the macroscopic droplets. This suggests that autophobic dewetting occurred in this system; i.e., a microscopically thin film was in equilibrium with macroscopic droplets. The growth velocity of holes in the polymer film was found to be constant at a fixed temperature in the stage of hole growth that could be studied using optical microscopy. The velocity was found to be an exponential function of temperature. Copyright 1999 Academic Press.
Hamley
LW
School of Chemistry, University of Leeds, Leeds, West Yorkshire, LS2 9JT, United Kingdom
Hiscutt
EL
Yang
Y
Booth
C