Poly dendrimers monodendrons

Hydrodynamic radii of poly(benzyl ether) dendrimers are shown in Fig. 5. Data for monodendrons with a hydroxyl focal group and tridendrons fall on the same curve. The value of the exponent v in Eq. (4) is 0.46 of low MW. At high MW it is 0.26 [48]. Data on low MW linear polystyrene in benzene [74] have been included in Fig. 5 for comparison. They highlight the little difference in the actual values of the hydrodynamic radii of linear polystyrene and low MW poly(benzyl ether) dendrimers. Deviations are observed only when MW>5xl03. Furthermore, the MW dependence of the radii of polystyrene and poly(benzyl ether) dendrimers are the same at low MW. This indicates that it remains impossible to draw major conclusions about the conformation of the low MW dendrimers from their global properties. The low values of the hydrodynamic radii of the high MW dendrimers, on the other hand, attest to their compact conformation. A similar transition to more compact dendrimers has recently been shown in a direct comparison of linear and dendritic poly(benzyl ethers) [75]. 

Fig. 5. Dependence of the hydrodynamic radius of poly(benzyl ether) dendrimers on molecular weight Q monodendron tridendron data on low MW polystyrene (A) in a good solvent are included for comparison...

Figure 2. Structures of some commonly known dendrimers A. Polyamidoamine (G2) B. Poly(propylene imine) (G4) C. Benzyl ether monodendron (G3) and D. Poly(phenylene) dendrimer (G2). (G represents the generation number)...

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