  Manipulating the self-assembly nanostructures with combined different control
measures is emerging as a promising route for numerous applications to generate
templates and scaffolds for nanostructured materials. Here, the two different
control measures are a cylindrical confinement and an oscillatory shear flow.
We study the phase behavior of diblock copolymer confined in nanopore under
oscillatory shear by considering different $D/L_0$ ($D$ is the diameter of the
cylindrical nanopore, $L_0$ is the domain spacing) and different shears via
Cell Dynamics Simulation. Under different $D/L_0$, in the system occurs
different morphology evolution and phase transition with the changing of
amplitude and frequency. Meanwhile, it forms a series of novel morphologies.
For each $D/L_0$, we construct a phase diagram of different forms and analyze
the reason why the phase transition occurs. We find that although the
morphologies are different under different $D/L_0$, the reason of the phase
transition with the changing of amplitude and frequency is roughly the same,
all caused by the interplay of the field effect and confinement effect. These
results can guide an experimentalist to an easy method of creating the ordered,
defect-free nanostructured materials using a combination of the cylindrical
confinement and oscillatory shear flow.
