The DX centre
T.N. Morgan
Semiconductor Science and Technology
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.
T.N. Morgan
Semiconductor Science and Technology
A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
G. Will, N. Masciocchi, et al.
Zeitschrift fur Kristallographie - New Crystal Structures
T. Schneider, E. Stoll
Physical Review B