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Study on Gels of Poly(methyl methacrylate) Stereocomplex by Light Scattering

We examined the formation and stability of poly(methyl methacrylate) (PMMA) gels. The gels were formed by mixing semidilute solutions of iso and syndiotactic PMMA in dimethyl formamide (DMF) at different temperatures. We studied the influences of polymer concentration, stereoregularity of the syndiotactic component and temperature in the kinetics of gel formation, and in the thermal stability of the gels formed. The analysis of this phenomenon has been carried out by light scattering. We verified the existence of a necessary minimum length of tactic sequences for these sequences to associate. This length increases with temperature. We also observed the existence of a bounding concentration from which the interactions, produced between tactic chains, pervade the whole solution forming a stiff gel. Below this concentration, the stereocomplex can also form perceptible aggregates but without involving the whole solution even after a long time of complexation.