ANISOTROPIC FLUCTUATIONS IN ORDERED COPOLYMER PHASES

The random phase approximation is reformulated to investigate the anis otropic fluctuations about an ordered polymer phase. This very general method is applied to the lamellar phase of block copolymers. The calc ulated anisotropic scattering intensity captures the main features obs erved experimentally including the secondary peaks due to fluctuations with hexagonal symmetry. We also determined the limits of metastabili ty of the lamellar phase as well as the bending and elastic moduli of the lamellae.