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The comparison between the physical properties of dendrimers and polymers shows the specific structure and behavior of dendrimers. Methylsilsequioxane dendrimers are of fundamental interest, since they are analogous to such siloxane structures - namely polydimethylsiloxanes, comb-shaped polymers, hyperbranched polysilsesquioxanes, to provide the same elemental composition but different molecular structure. Therefore, the study and comparison of the properties of these structures afford us to establish a ratio structure - properties.