Phase Behavior Of Rigid-flexible Diblock Copolymers On Cylindrical Surfaces

This paper studies the influence of parameters in the system on the phase behavior of rod-coil diblock copolymer on the surface of the cylinder As a result,the rod-coil equation is firstly discretized using the operator split method,and the one-dimensional FFT transform is used for the coil chain.Use two-dimensional FFT transform on the rod chain,use the steepest descent method as the iterative method to update the field function to find the equilibrium state Saddle point,after optimizing the field function,iteration step size and calculation speed,by selecting different parameters,we get To a total of ten different structures,namely the nematic phase,the semetic-z phase,the semetic-p phase,the semetic-Phase c,wavy phase,zig-zag phase,butterfly phase,four spot phase,six shift phase,ISO phase.After obtaining the corresponding structure,let's study the parameters Flory-Huggins force N and soft chain hardness in the system.And the influence of the change of the chain length L on the system structure under different f(coil chain ratio of the entire chain),in the After the corresponding numerical results are made,the corresponding phase diagram is made to observe the approximate changes between the various structures after the parameter changes.Cheng,by comparing the energy of each structure after reaching equilibrium,to verify that the transformation between the two structures is gradually change or jump.