Optical Polarization Technique for Observing Filler Packing-structure in the Ceramic-powder Filled Resin Polymer Composite Systems

抄録

This paper offered a polarization in transparent optical microscopy as one of observing technique for internal-structure (powder packing-structure) of the resin polymer composite system filled with ceramic filler-powder. The technique visualized the heterogeneous powder packing as brightened features at crossed-polarization, and contributed to clarify the influence of particle size distribution and coupling treatment of filler-powder on internal microstructure of the polymer composite. The brightened features were appeared to have an optical anisotropic property; i.e., repeated changes between bright/dark under rotating specimens at every 45° increments, optical addition/subtraction retardations and positive optical character of elongation under observation using tint plate. The optical anisotropy was often observed in the filler systems with narrow size distribution and the systems under coupling treatment. The amounts of optical anisotropy showed the good agreement with rheological properties in systems, although they could not be understood only from filler primary properties; such as median diameters, particle size distributions and specific surface areas.