Dendronized methacrylates containing 3,5-diphtalimido alkylphenyl moieties with ethyl (M-EthylG(1)), propyl (M-PropylG(1)) and butyl (M-ButylG(1)) spacer groups were synthesized. Monomers of the first generation were polymerized by radical polymerization using AIBN as initiator. The corresponding polymers (P-EthylG(1)), (P-PropylG(1)) and (P-ButylG(1)) were obtained. Monomers and polymers were characterized by H-1-NMR, C-13-NMR, FT-IR spectroscopic measurements. Molecular weight was estimated by following the nitrogen content in the obtained polymers. Molecular Dynamic Simulation (MDS) was performed in order to evaluate the radius of gyration (Rg) and the end-to-end distance (r(ee)) to estimate the stiffness of the backbone and of the dendrimers. According to the conformational analysis it is possible to observe different spacial arrangements depending on the length of the spacer group.