Chains bearing dendritic wedges

A GGS model was used to treat side-chain dendritic polymers [78]. The model is given in Fig. 21 it consists of chains bearing dendritic wedges (CBDW) in their middles. A dendritic wedge (DW) differs from a conventional classical dendrimer in that its core has one main branch less /c = (/ - 1). For such DW the results of the previous section hold [74,78]. In particular, the maximal relaxation time of a DW is the same as that of a classical dendrimer, because this time corresponds to the motion of two main branches against each other. 

The simplest GGS model for such polymer networks is the so-called fixed-chain-ends model a single chain bearing dendritic wedges (CBDW), whose ends are fixed in space (immobile) [78]. From a physical point of view, it cor-... 

Fig. 32 2-D polymer network built from chains bearing dendritic wedges. Note that in the simplified fixed-chain-ends model the cross-linking points (depicted here as open beads) are assumed to be fixed in space, see text for details...

Scheme 1. a) Frechet-type [18] dendritic wedges used as conical or fan-like building units b) schematic image of a polymer chain that bears dendritic side groups [27J. 

Fig. 21 Polymer chain bearing a dendritic wedge in its middle...

Fig. 22 Reduced storage modulus [G ( )] plotted on double logarithmic scales versus the reduced frequency coto for chains bearing trifunctional dendritic wedges of third, fourth, fifth, and sixth generation. All chains have the same length and consist of 51 beads Whain = 51) [78]...

Fig. 33 Reduced storage modulus [G ( )] versus the reduced frequency to plotted on double logarithmic scdes. Shown are results for 2-D networks bearing trifunctional dendritic wedges of fifth (dashed line) and seventh (solid line) generations. Also displayed are the results obtained from a simplified fixed-chain-ends model for the same dendritic wedges, namely g = 5 (line with stars) and g = 7 (line with circles). The chains between the cross-links consist of 51 beads each...

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