合成波を用いた新しい粘弾性の周波数同時測定法(FT-RM)の顔料分散系への応用

Cone-plate Type Fourier Transform Rheometerの開発

抄録

This paper proposes a new method for measuring frequency dependence of G′ and G″, using a coaxial cone-plate type rheometer oscillated by multifrequency wave, named Fourier Transform Rheometer (FT-RM). The experimental results manifest that this FT-RM is much more superior than the conventional dynamic method for obtainning the freaquency dependence curves of G′ and Gn for disperse systems in transition state. The FT-RM is more acculate for the measurements in curing process of automobile primer paint than a pulse method using a Raised Cosine Pulse. A gel point of the coated layer is specified by the frequency dependence curves of G′ and G″ at various temperatures. Effect of shearing on the viscoelastic properties is also examined in silica dispersions using an electromagnetic induction torque transducer. For the disperse systems including chemically modified hydrophobic silica with a good affinity for vehicle, G′ increases with shearing process. On the other hand for the suspensions of untreated silica with poor affinity for vehicle, G′ decreases with shearing process.