EBI Joining Between Different Polymers Without Adhesive Materials
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EBI Joining Between Different Polymers Without Adhesive Materials Hironori Sato1, Keisuke Iwata2, Akira Tonegawa2, and Yoshitake Nishi1,2 1 Department of Metallurgical Engineering, Graduate School of Engineering, Tokai University, Hiratsuka, 259-1292, Japan 2 Department of Science and Technology, Graduate School of Science and Technology, Tokai University, Hiratsuka, 259-1292, Japan ABSTRACT Joining between Nylon-film and Silicone-rubber was successfully developed by using homogeneous electron beam (EB) irradiation. Effects of EB irradiation on joining strength of different polymers without adhesive materials were investigated. Although excess EB-irradiation more than 0.3MGy apparently decreased the joining strength, the EB irradiation increased the joining strength of the joining sample between Nylon-film and Silicone-rubber. To discuss the influences of EB irradiation on the joining strength, electron spin resonance (ESR) signals related to dangling bonds were observed. Since EB irradiation generated dangling bonds on Nylon-film, dangling bonds probably supported the different polymers at interface. INTRODUCTION The joining of different polymers is one of important points to be used in process engineering for biomedical application. The acrylic binder and the thermal dissolution (welding) are generally used to join the different polymers. However, they are serious problems. If the new joining method without adhesion has been developed, it is possible to use for the new joining process for many applications. On the other hand, low-energy electron beam (EB) irradiation is generally industrial surface treatment process to enhance surface energy and misting resistance of polymer [1]. To enable freedom from misting and easy sterilization of ceramics, EB irradiation techniques are presently being developed to assist the production of dentists’ mirrors, sapphire lenses and diamond windows for endoscope [2-4]. Since the EB irradiation is generating the dangling bond for the polymer, it is enhancing the surface energy by the EB irradiation. In addition, although the treatment time is too long for ultraviolet [UV] irradiation, EB-Irradiation is effective as highspeed processing. If different polymers are joined each other by EB-irradiation, it is possible to develop the new joining process. Therefore, we have undertaken the present study to investigate the possible beneficial effects of EB irradiation on the joint strength between different polymers. EXPERIMENTAL PROCEDURE The sizes for Nylon-film and Silicone-rubber are 10 x 10 mm squares sheets. Thickness of Nylon-film and Silicone-rubber are 0.025 mm and 2.0mm. The sheets are homogeneously irradiated using an electron-curtain processor (Type CB175/15/180L, Energy Science Inc., Woburn MA, Iwasaki Electric Group Co. Ltd., Tokyo) [2-5]. The specimen is irradiated by the electron beam through a titanium thin film window attached to the vacuum chamber (240 mm in diameter). A tungsten filament in the vacuum chamber generates the electron beam using acceleration p
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