Polystyrenes arborescent graft

Winter, H.H. Evolution of rheology during chemical gelation. Prog. Colloid Polym. Scl,15,104—110,1987. Hempenius, M.A. et al. Melt rheology of arborescent graft polystyrenes. Macromolecules, 31, 2299, 1998. 

Figure 12.5 [18] Structure of the monolayer of S05-3 arborescent graft (dendri-graft) polystyrenes cast on mica as prepared (A) and Fourier filtered (B)...

Fig. 4a, b. Monolayer structure of arborescent graft polystyrenes of different branching densities adsorbed on mica [71] a spherical particles correspond to individual molecules of = 2.8x10 g/mol and N = 5 b disk-like structures correspond to AGP with M,= 5.5 X 10 g/mol and N = 20... 

Fig. 17. Monolayer of arborescent graft macromolecules consisting of a polystyrene core and poly(2-vlnylplrldlne) shell. Microphase separation between the blocks and strong interaction of the PVP block with mica resulted In lateral arrangement of the PS and PVP domains [89]...

For the subsequent generation of arborescent graft polystyrenes, a dramatic increase in rj0 was observed by Hempenius et al. [43] for each of the three series included in their study. However, despite this increase in viscosity, the rj0 for each of these is still lower than that of the linear homologue polystyrenes of the same overall molecular weight. This jump in viscosity is due to an increase in branch density which in turn results in increase in chain extension similar to that observed by Roovers [31] for highly branched star polymers. 

This chapter focuses on the latest efforts in our laboratory aimed at the synthesis and the physical characterization of arborescent polymers. The synthesis of arborescent styrene and isoprene homopolymers is discussed, together with copolymers incorporating a polystyrene substrate grafted with side chains of different compositions such as poly(2-vinylpyridine). 

Table 6.1 Characteristics of successive generations of two series of arborescent polystyrene (Adapted with permission from J. Li and M. Gauthier, A novel synthetic path to arborescent graft polystyrenes, ...

Table 9.4 Characteristics of arborescent polystyrene substrates used in the preparation of isoprene graft copolymers (adapted from ref. 16)...

Gauthier M, Li J, Dockendoiff J (2003) Arborescent polystyrene-graft-poly(2-vinylpyridine) copolymers as unimolecular micelles. Synthesis from acetylated substrates. Macromolecules... 

Scheme 6.2 Arborescent polystyrene synthesis by grafting onto chloromethylated polystyrene.

Physical Characterization of Arborescent Polystyrene-graft-Poly(2-vinylpyridine)... 

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