AB n-Type Star Block Copolymers

Generally, the number of the shell chains in a microsphere ranges from a few hundred to a few thousand. The range of the diameter of the core is from 10-100 nm. Such a core-shell structure is very similar to the (AB)n type star block copolymers, which have many arms and spherical polymer micelles of the block or graft copolymers formed in selective solvents that are good for the corona sequence and bad for the core sequence. In fact, many theoretical investigations of the chain con-... 

The feature of the core-shell type polymer microspheres that differentiates them the most from the (AB)n type star block copolymers is size. The external diameters of the core-shell type polymer microspheres are generally from about 20-200 nm in the good solvents instead... 

Cationic synthesis of block copolymers with non-linear architectures has been reviewed recently [72]. These block copolymers have served as model materials for systematic studies on architecture/property relationships of macromolecules. (AB)n type star-block copolymers, where n represents the number of arms, have been prepared by the living cationic polymerization using three different methods (i) via multifunctional initiators, (ii) via multifunctional coupling agents, and (iii) via linking agents. 

AB)n-type star corresponds to a star with n similar AB block copolymer branches... 

For relatively homogeneous AB, ABA and (AB) X copolymers (where the latter are star-shaped systems with n = 3, 4, 5, etc. in which both blocks are non-crystalline, it has been shown by transmission electron microscopy (TEM) and diffraction methods that three basic types of domain are possible, " These are spheres, cylinders and alternating lamellae. Because of the difficulty of... 

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