Effects of Electron Beam Irradiation on Adhesive Force of Laminated Sheet of High Strength Polytetrafluoroethylene (PTFE) and Bio-Adaptable Polydimethylsiloxane (PDMS)

摘要

The effects of homogeneous low voltage electron beam irradiation (HLEBI) on the adhesive force of peeling (~°F_p) and peeling resistance energy (~oE_p) at each peeling probability (P_p) of laminated sheets of bio-adaptable polydimethylsiloxane (PDMS) with transparency and high strength polytetrafluoroethylene (PTFE) with sterilization were investigated without glue. Although both ~°F_p and ~oE_p of peeling at low P_p of 0.06 were 0.2 N?m~(-1) and 4.0 x 10~(-2) J?m~(-1) before treatment, HLEBI enhanced the ~°F_p and ~oE_p up to the largest values of 11 N?m~(-1) and 2.2 J?m~(-1) of the laminated sheets irradiated at 0.13 MGy, respectively. They were more than 55 times larger that those before treatment. On the other hand, additional HLEBI reduced the ~°F_p and ~oE_p of laminated sheets irradiated at more than 0.22 to 0.86 MGy, although they were apparently larger than those before treatment. In order to investigate the influence of EB irradiation on ~°F_p and ~oE_p, electron spin resonance (ESR) signals related to dangling bonds were observed. When HLEBI cut the chemical bonds and generated dangling bonds with nonbonding electrons in PTFE and PDMS, the electrons induced the chemical bonding and intermolecular attractive force. HLEBI induced strong adhesive force of laminated sheets was explained by the discussion. Therefore, it was concluded that HLEBI was a useful tool for quick lamination of bio-adaptable PDMS and high strength PTFE.