2012 Volume 53 Issue 9 Pages 1657-1664
The effects of homogeneous low voltage electron beam irradiation (HLEBI) on the adhesive force of peeling (oFp) and peeling resistance energy (oEp) at each peeling probability (Pp) of laminated sheets of bio-adaptable polydimethylsiloxane (PDMS) with transparency and high strength polytetrafluoroethylene (PTFE) with sterilization were investigated without glue. Although both oFp and oEp of peeling at low Pp of 0.06 were 0.2 N·m−1 and 4.0 × 10−2 J·m−1 before treatment, HLEBI enhanced the oFp and oEp 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 oFp and oEp 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 oFp and oEp, 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.