METHOD FOR OBTAINING REACTION ACTIVE GROUP AMOUNT OF SILICA, RUBBER COMPOSITION WHOSE REACTION AMOUNT OF SILICA IS SPECIFIED BY USING THE SAME, AND PNEUMATIC TIRE USING RUBBER COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a method for obtaining a reaction active group amount of silica, which achieves excellent quantitativity and a relatively short measurement time, a rubber composition whose reaction amount of the silica is specified by using the method, and a pneumatic tire using the rubber composition.SOLUTION: A method obtains a reaction active group amount of silica from a spectrum of the silica, which is measured by uniform driven equilibrium Fourier transform (UDEFT), in a measurement mode DD/MAS of high-resolution solid-stateSi-NMR.