Abstract
The evolution of surface topography in conformationally strained diblock copolymer films comprised of 3/2 lamellar bilayers was investigated by optical microscopy. Films of thickness 1.25D* < L < 1.5D* developed two-dimensional isotropic fractal holes with df = 1.67 following heterogeneous nucleation, where D* is the equilibrium lamellar spacing. A microscopic theory is presented that maps this hydrostatic tension driven hole growth instability onto the classical description of pattern formation during solidification.
Original language | English (US) |
---|---|
Pages (from-to) | 1861-1864 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 81 |
Issue number | 9 |
DOIs | |
State | Published - 1998 |