The gelation transition in polymeric systems is characterized by a dramatic change in the viscoelastic properties corresponding to the formation in the sol of a macroscopic polymeric structure, the gel phase. It is usually described in terms of the divergence of the viscosity coefficient and the appearance of an elastic behaviour. With the growth of the connectivity the relaxation mechanism in the system involves the rearrangement over many different length scales, producing slow dynamics and non-exponential behaviour.  We here discuss our approach to the study of the dynamics at the sol-gel transition in a polymeric system, based on a percolation model with bond-fluctuation dynamics. We present the main results and discuss them within the debate on the experimental data and the prediction based on different models.

Ritorno all'elenco dei poster