Yoav Tsori

We investigate the morphologies of block copolymers confined in the region between two concentric and charged cylinders. The relative stability of a concentric lamellar phase compared to one where the lamellae are oriented in the radial direction is determined from the competition between long-range elastic and electrostatic forces. We find in weak and strong segregation and by single-chain-in-mean-field simulations that under sufficiently strong voltage difference there is a phase transition from concentric to radial lamellae containing defects. Above a threshold voltage the block copolymer melt develops an interfacial instability at a finite wavelength.