Joining between Nylon-film and Silicone-rubber was successfully developed. Effects of EB-irradiation on joining strength of different polymers without adhesive materials were investigated by using homogeneous EB irradiation. The EB irradiation increased the joining strength of the joining sample between Nylon-film and Silicone-rubber. Excess EB-irradiation more than 0.3 MGy apparently decreased the joining strength. To discuss the influences of electron beam irradiation on the joining strength, ESR signals related to dangling bonds were observed. Since the EB irradiation produced detectable dangling bonds on Nylon-film, using dangling bonds probably joined the different polymers.

Low-energy electron beam (EB) irradiation, generally applied to enhance hardening and wear resistance of polymer, was a successful surface treatment. Effect of EB irradiation was the homogeneous activation of surface atoms and the breaking of the chemical bonds in the network structure of a surface layer of inorganic glasses. When EB irradiation generated dangling bonds at the weaker-bonded metal-oxygen atomic pairs in the glass network structure, partial relaxation occurred at points of residual strain in the network structure. It was clear that the increased rigidity was mainly due to an increase in the bonding energy of the stronger-bonded metal-oxygen atomic pairs in the atomic network structure. The possible beneficial effects of EB irradiation on the impact value of transparent inorganic glass was investigated. To clarify the results, ESR observations were used to confirm the existence of dangling bonds. The EB irradiation increased the impact value of the transparent inorganic glasses. Based on the ESR signals of transparent glasses before and after EB irradiation, the high density of dangling bonds was obtained.

A crack reduction by electron beam (EB) irradiation treatment for carbon fiber, used without the traditional method of accompanying heat, was developed to modify the mechanical properties at lower temperature. The EB treatment improved the resistance to fracture. Namely, the maximum ratio of fractured samples (maxRf) and the minimum bending strain on fracture (minεf) were defined as simple indicators of fracture resistance and became smaller by the EB treatment. Furthermore, a critical density of dangling bonds for a fracture was suggested and determined for carbon fiber treated by EB irradiation. The EB irradiation to reduce cracking and the determination of the critical density of dangling bonds are new concepts that can be broadly applied in the fields of aerospace and rapid-transit production engineering.

We developed a diamond surface that does not mist near the room temperature under a saturated humidity atmosphere, by sheet electron beam irradiation (SEBI) treatment. SEBI treatment decreased the time to clear vision of the diamond surface. Following SEBI treatment for 1.91 s (= 0.72 MGy) to a diamond surface, the time to clear vision was less than 2 s. The effective duration time was a few hours. Based on the results of the size distribution of the drops on the misting-free diamond surface following blowing for 3 s, we proposed an explanation for the short time to clear vision of the diamond surface treated by SEBI.

A misting free dental mirror is obtained near the human temperature under the saturated humidity atmosphere by use of the sheet electron beam irradiation treatment. It is shown that electron beam irradiation treatment decreases the time to clear vision in a misted mirror. This effect is due to an enhancement of the interfacial energy between the dental mirror glass and water.