Rheological Behavior and Microstructure of Aqueous Suspension of Carboxylated Core-Shell Structured Latex Particle

摘要

Core-shell type carboxylated particles form a flocculated structure in aqueous suspension with neutralization of carboxyl gorups. Rheological behaviors of the suspension have been studied at various temperatures, and microstructures of the ssupension have been discussed from the rheological behavoirs and SAXS measurements. At 25 deg C, G' is larger than G'' in all #omega# regions, and G' is almost independent of #omega#, and the diffraction peak is detected by SAXS. These results mean that a three-dimensional netowrk of interconnected lattice-like flocculated structure is formed. With increasing temperature, #omega# dependency of G' becomes stronger and distance of the particles of the structure does not changed. These mean the netowrk linkage is disrupted partially by thermal motion, and the interconnected lattice-like flocculated structure changes to an isolated lattic-like one with increasing temperature. With increasing the degree of neutralization, an isolated structure changes to an interconnected three-dimensional structure decreasing the thermal notion just like decreasing temperature.