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The structural arrest of a polymeric suspension might be driven by anincrease of the cross--linker concentration, that drives the gel transition, aswell as by an increase of the polymer density, that induces a glass transition.These dynamical continuous (gel) and discontinuous (glass) transitions mightinterfere, since the glass transition might occur within the gel phase, and thegel transition might be induced in a polymer suspension with glassy features.Here we study the interplay of these transitions by investigating viaevent--driven molecular dynamics simulation the relaxation dynamics of apolymeric suspension as a function of the cross--linker concentration and themonomer volume fraction. We show that the slow dynamics within the gel phase ischaracterized by a long sub-diffusive regime, which is due both to the crowdingas well as to the presence of a percolating cluster. In this regime, thetransition of structural arrest is found to occur either along the gel or alongthe glass line, depending on the length scale at which the dynamics is probed.Where the two line meet there is no apparent sign of higher order dynamicalsingularity. Logarithmic behavior typical of $A_{3}$ singularity appear insidethe gel phase along the glass transition line. These findings seem to berelated to the results of the mode coupling theory for the $F_{13}$ schematicmodel.

Dynamical arrest: interplay of the glass and of the gel transitions