Abstract
Commercial fillers are widely used in the industrial manufacturing of silicone-based sealants such as CaCO3 filled polydimethylsiloxane (PDMS). The surface property of calcium carbonate, which is readily influenced by the adsorbed water and chemical modifiers, results in different rheological performances of the composites. However, it is difficult to characterize the surface due to the multiple contributions from the morphology, functional groups, and pore structure. In this work, the surface property was differentiated by the surface energies using inverse gas chromatography (IGC). The dispersive interaction was determined by n -alkanes (C7-C10), and the specific components were evaluated by cyclohexane, benzene, trichloroethylene, and tetrachloroethylene. The calcium carbonates showed the different dispersive interaction and the varied specific component on the modified surface. It was suggested that the dispersive interaction between calcium carbonate fillers and PDMS impacted the viscosity of the formed composite.
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