Mikiya Ito

Basic Approach to Graded Compound of Magnetic Particle with Polyester Resin in Magnetic Field

Functionally Graded Material (FGM) is a characteristic material having many functions and possibilities. The improvement of the long term stability is strongly necessitated by railway polymeric materials. To carry out the purpose, FGM is an expected material that enables to improve the certain properties and affinities. The authors tried to produce a graded compound of the magnetic particles in the polymer matrix in the magnetic field. From the results, the graded compound of the magnetic particles was produced by the control of magnetic flux. In particular, the control of time during which the magnetic field was charged was effective to improve the dispersion state of the magnetic particles in polymer matrix.

Evaluation of long-term stability and degradation on polycarbonate based plastic glass

Abstract Polycarbonate (PC) is mainly used as plastic glass in the industrial field. PC has many advantages such as light weight and high impact strength as compared to inorganic glass. However, the long-term stability of PC through the service life has not been fully examined. The authors analyzed the degradation behavior of PC glass through long-term artificial weathering conditions. The PC glass became yellowish through artificial weathering; however, the mechanical strength, for example, the flexural strength and the impact strength, were sufficient for its use as actual window glass of the public transportation. Moreover, improved PC is expected to have a longer service life as compared to ordinary PC. In addition, the evaluation of the degradation of PC-based plastic glass was studied with use of color measurement.