Theoretical Study on the Self-assembly of Diblock Copolymers under Cylindrical Confinement with Alternately Adsorbed Surfaces
The self-consistent field theory(SCFT)is employed to study the self-assembly behavior of AB diblock copolymers confined in alternately adsorbed nanopores.Focusing on the emergence and stability of the disk(Dk)phases,a series of phase diagrams are constructed with respect to the alternating adsorption period(w),size of the cylindrical pore(D),and the volume fraction of the A block(f).The results indicate a significant enhanced stability of Dk structure by the alternately adsorbing surface fields.The Dk structure is especially favored,when the alternating adsorption period is around 5.0Rg.With fixed w=5.0Rg,the appearance of the Dk structure is tuned by D and f,it forms biconcave shape with negative curvatures within a certain varying ranges of D and f,otherwise it transforms into ellipsoidal or toroid shapes.Additionally,a number of novel cylinders and regularly arranged spheres emerged in the nanopores with specific surface fields.The results deepen the understanding of self-assembly behavior of block copolymers under cylindrical confinements,and provide theoretical guidance for the experimental preparation of such complex structures.
Block copolymersSelf-assemblyCylindrical confinementSurface field inductionSelf-consistent field theory(SCFT)
万方数据
维普
