[en] Ethylene-propylene rubber has particular good heat resistance, weather resistance and ozone resistance. It is widely used in automotive rubber parts, rubber sheets, etc. This report describes research on electron beam crosslinking of ethylene-propylene rubber and its application in rubber products. (author)

[en] Photorefractive grating formation dynamics in long-timescale writing and the effects of periodic writing through the control of writing beam irradiation or electric field application were investigated using typical photorefractive polymers. Both dark current and writing beam irradiation affected grating formation dynamics. Dark current in polymers changed the effective trap density over time through deep trap filling and/or detrapping and thus affected grating formation considerably. The writing beam irradiation also affected grating development in the presence of an electric field owing to the accumulation of filled deep traps. However, grating development recovered after the elimination of the electric field freed up the filled deep traps