Rigidity of plasticizers and their miscibility in silica?filled polybutadiene rubber by broadband dielectric spectroscopy

An efficient use of plasticizers in rubber compounds requires an understanding their miscibility behavior. Besides the chemical properties both and plasticizer, rigidity plasticizer plays important role for miscibility. The is investigated here using glass transition measured by differential scanning calorimetry broadband dielectric spectroscopy (BDS). Additionally, interfacial relaxation phase separation BDS are confirmed transmission electron microscopy. While flexible poly-(?-methylstyrene), stays miscible a silica-filled polybutadiene compound, more rigid indene-coumarone (IC), shows at high concentrations. phase-separated IC tends to accumulate silica surface.