サスペンションのレオロジー的性質に及ぼす粉体表面の熱処理の影響

抄録

The amount of silanol groups on the surface of glass or clay particles varies due to condensation reaction caused by heat treatment and the variation is measured by infrared spectroscopy. The variation affects the rheological properties of suspensions of these particles in polymer solutions as media. This effect is studied by applying sinusoidal deformation to the suspensions in a coaxial cylinder rheometer. Without heat treatment, the amplitude ratio of stress to strain exhibits a plateau, the second plateau, over a frequency range outside the plateau region of the medium. The height of the second plateau decreases in parallel to the decrease of the absorbance of 3700 cm^-1 band characteristic of surface silanol groups. It is concluded that the surface silanol groups are primarily responsible to the aggregation of dispersed particles in the suspensions.