Linear dendritic star copolymers

Linear-dendritic star copolymers [5], most frequently obtained via processes in which dendrimers function as multifunctional initiator cores for the poly-... 

Motivated by the preparation of wdl-defined hyperbranched polyglyddols, a variety of polyglyddol-based complex polymer architectures were synthesized. These include linear-dendritic block copolymers,random copolymers, and multiarm star copolymers. ... 

The precursor polymer blend can be made out of (1) linear block copolymers, (2) AB block copolymers, (3) ABA block copolymers, (4) ABC block copolymers, (5) multiblock copolymers, (6) symmetrical and asymmetrical star block copolymers, (7) blends of polymers, (8) graft copolymers, (9) multibranched copolymers, (10) hyperbranched or dendritic block copolymers, and (11) novel brush copolymers. 

The most common pH-sensitive polymer structures described in the literature are linear homopolymers or copolymers, amphiphilic block copolymers which form micelles, grafted copolymers, polymer brushes, star and dendritic polymers, NPs, vesicles or HGs (Fig. 3.4). Some of these examples are explained in this section. 

Aiming at modulating further their physical and chemical properties, and thereby at extending their apphcation fields, PLGAs have been incorporated into a broad variety of macromolecular architectures, including linear/grafted block copolymers and star/dendritic polymers. 

Yu, D. Vladimirov, N. Erechet, J.M.J. MALDI-TOE in the characterizations of dendritic-linear block copolymers and stars. Macromolecules 1999, 32, 5186-5192. 

FIGURE 2.1 Various possible architectures for amphiphilic copolymer (a) linear block copolymers with different numbers of A and B blocks, (b) cyclic block copolymers, (c) star block copolymers, (d) graft block copolymers, (e) block copolymers with dendritic or hyper-branched blocks, and (f) semitelechelic polymer (upper), telechelic polymer (middle), and asymmetrical telechelic polymer with different hydrophobic chain ends [9]. 

With the significant progress in the living polymerization techniques , in the design of multifunctional initiators and the control in coupling reactions a large variety of block copolymers with sophisticated architecture became available such as cyclic, H and star shaped, multiarm and pahn-tree or dumbell structures, dendritic blocks linked to linear blocks, etc. 

Although, there are many reviews on linear diblock chimeras, only a very few have addressed the synthesis of polypeptide-based materials with different macromolecular architectures (Hadjichristidis et al., 2009 Deming, 2006 Deming, 2000). In this chapter our discussion on the synthesis of well-defined complex chimeras, including linear multiblock co/ terpolymer, as well as nonlinear copolymer chimeras (e.g. star, graft, block-graft, dendritic), will hopefully enrich the current literature on macromolecular chimeras. This chapter will not address the self-assembly of these complex chimeras since this issue is discussed in another chapter of this volume. 

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