About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Physical Review B - CMMP
Paper
Effect of structural anisotropy on the coarsening kinetics of diblock copolymer striped patterns
Abstract
We compare the time evolution of striped pattern correlation lengths for three different poly(styrene- b -methyl methacrylate) (PS-b-PMMA) diblock copolymer materials having comparable molecular diffusion rates. Striped patterns formed from cylindrical-phase materials coarsen with enhanced growth exponents and have reduced disclination diffusion activation energies as compared to striped patterns formed from smectic A lamellar-phase materials. The observed differences stem from distinct topological constraints in cylindrical (columnar) and lamellar (SmA) striped patterns. Cylindrical domains create a channel for layer breaking without molecule interdiffusion, facilitating an enhanced rate of pattern coarsening and reducing the disclination diffusion activation energy. © 2008 The American Physical Society.