Diblock copolymers cylindrical pores

Weak preference to block copolymer. Figure 26 shows the MC simulated morphologies of A5B5 diblock copolymers confined in cylindrical nanopores with the different exterior radii Rex and eAS = bs = 0. It is shown that the lamellar structure forms parallel to the pore axis. However, there is a little difference between small and large Rex. The lamellar structure is not bended at small Rex as shown in Figure 26a, while it is bended like the wave-shape at large Rex as... 

According to the MC simulation results mentioned above, if the diblock copolymer melts are confined in cylindrical pore or between two concentric curved surfaces with strong preference to one of the blocks, the... 

Fig. 24 Self-assembled morphologies of an asymmetric diblock copolymer confined to cylindrical pores obtained by a simulated annealing method as a function of the ratio Dp/Lo> where Lq is the period of the BCP, for different wall-polymer interactions. The parameter Dp/f-o is given underneath each morphology. The outmost circles in the top views indicate the wall of the cylindrical pores. For some large diameters, the inner ring is shown separately, a The pore wall attracts the majority blocks b the pore wall attracts the minority blocks c neutral pore walls. Reproduced from [213]. (2006) American Physical Society...

Fig. 26 Phase diagram for a diblock copolymer melt confined in a cylindrical pore with a Dp-value of 17 times the radius of gyration. The degree of polymerization of the copolymer is N, the Flory-Huggins parameter is x> and / is the A monomer fraction. The disordered phase is labeled D the other labels are as in Fig. 25. The dashed curve is an interpolation of the order-disorder transition curve. Reproduced from [2021. (2006) American Chemical Society...

Combination of two stimuli-responsive polymers with low polydispersity as grafted diblock copolymer brushes in cylindrical pores leading to four different effective pore diameters as a function of the combination of the two stimuli (temperature change, AT, around the lower critical solution temperature of the first polymer block/here PNlPAAm pH change, ApH, around the pKa of the second polymer block/here PAA) (From Friebe, A., and Ulbricht, M., Macromolecules, 42,1838-1848,2009.)... 

Figure 3 Morphologies of bulk cylinder-forming diblock copolymers confined in cylindrical pores from Monte Carlo simulations. The model diblock copolymer is at the strong segregation region and so the cylinders are robust. The morphologies can be viewed as different arrangements of the basic cylindrical structure. Reproduced from Yu, B. Jin, Q. Ding, D. et a . Macromolecules 2008, 41,4042, with permission. Copyright 2008, American Chemical Society.

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