Theoretical Study Of Self-assembly Structure In Block Copolymer Films

On the premise that Lu et al.found through physical experiments that block copolymers(BCPs)films can form a vertical columnar structure with six revolutions through self-alignment,we use the Landau-Brazovskii model and mass-conserved equation simulations to investigate the effect of self-assembly of block copolymers to understand and control our experimentally found structures.Firstly,we verify the feasibility of the model for simulating the self-assembly of diblock copolymers.Secondly,simulating the dynamic process of the block copolymer self-aligning to form a cylindrical hexagonal structure.We systematically studied the effects of film thickness and initial value on block copolymers' morphology evolution during self-assembly.It is found that in a certain range,the thinner the film thickness is,the shorter the time required for the self-alignment of the block copolymer to form a vertical six turn columnar structure is.Interestingly,if there are six rotation initial values of dislocation at the bottom and top of the film after translation or rotation,we can clearly find that the block copolymers no longer only grow into vertical six rotation columnar structure but also grow into other structures,such as layer structure perpendicular to the film and inverse six rotation structure,etc.,for which we constructed the phase diagram of BCP.The current study demonstrates that our numerical experiments are consistent with the existing physical experiments and provide a useful tool for predicting and customizing BCP self-assembly structures.