Self-Assembly Of Block Copolymers Under Cylinderical Confinement With Chiral Patterns

The block copolymer is a typical soft material because it has a characteristic of a strong stress response to the external weight,so a "influence" is applied during the self-assembly process,and more novel phase structures can be obtained.Based on this feature,researchers propose the impact of the external environment to the self-assembly process with the restricted environment.In the restricted environment,the study of the geometry of the application structure can not only observe the system in the self-assembly process,but also clearly show the ontology state.It is difficult to note that the relationship between the proximal system is different.In many novel phase structures,the spiral phase is very eye-catching,which is a typical chiral structure.It is also important in macro and microscopic scales and is also important in practical applications.Based on this,this paper introduces two pattern-induced fields in cylindrical restrictions,and discusses non-hairdictive block copolymers under the role of chiral induction fields in the cylindrical restriction(TDGL)system.The mechanism and regularities of the formation of chiral helical structures.The first chapter describes the background and progress of block copolymers and their self-assembling.Chapter ? gives the kinetic method of studying block copolymers-(TDGL)formula derivation and theoretical model.The third chapter first introduces the AB two-block copolymer restricted spiral structure in short cylinders.In order to eliminate the degenerate phenomenon,an elliptical patch introduced in the cylindrical surface is proposed.The elliptical patch with a right-hand-friendly distribution has two induces in the minimum cycle unit.Both induction methods can eliminate the chiral degenerate phenomena in a certain phase of the cylindrical aspect,and obtain a uniform left-hand helical structure and Right-handed helical structure.Then,the patch-induced field induced the induction role of the long-range restricted block copolymer,and the results show that the appropriate field strength can make the system to obtain a long-range helical structure,and the field strength continues to increase the system to form a left-hand single helix structure.The kinetic path is changed.Note The induction effect of the patch-induced field is limited,and it can only obtain a matching single helix structure in a particular interval.Therefore,it is necessary to optimize the induced pattern,and propose a spiral inducer that matches the target structure after analysis.Select the same parameters,compare the induction of the elliptical patch induction field.From the phase diagram we found that the induction effect of the spiral belt is better than the elliptical patch,the induction of the spiral induced field is stable,with high theoretical reference value.The fourth chapter introduces the optimization of the spiral induction field.Two induction schemes are shown.When the induction pattern field is distributed at different surfaces of the cylindrical,there is also a certain induction extension in addition to the helical structure that matches the spiral position.As the number of induced field cycles increases with the distribution position,the system can evolve the long-range helical structure under the action of induce field,and the initial idea of our design induced pattern,especially the induced field distribution of three cycles.In the cylindrical surface,the degree of correlation between the induced field is increased,enhanced the spiral structure induction efficiency.Currently,there are very few literature on the addition of chemical pattern induced in cylindrical shimming to block copolymer self-assembly.The types and methods of pattern design are also small.The spiral band induced field model has enriched the type of induced pattern.