Tangible plasticization/filler effects of sodium salts of dimer acids on the mechanical properties of styrene ionomers

摘要

The effects of the presence of dimer acid (DA) molecules in Na-sulfonated polystyrene (PSSNa) and poly(styrene-co Na-methacrylate) (PSMANa) ionomers on the ionomer properties were investigated using a dynamic mechanical analysis technique. The DA decreased the matrix and cluster T_gs of PSSNa ionomer without changing the ionic modulus, suggesting that the DA resided both in the matrix and cluster regions of PSSNa ionomer and acted mainly as a plasticizer. On the other hand, the DA decreased the cluster T_g of PSMANa ionomer, without changing the matrix T_g, and also increased the ionic modulus, implying that the DA behaved like plasticizer only for the cluster regions.