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

Abstract

The effects of homogeneous low voltage electron beam irradiation (HLEBI) on the adhesive force of peeling ( o Fp) and peeling resistance energy ( o Ep) 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 o Fp and o Ep of peeling at low Pp of 0.06 were 0.2N·m ¹1 and 4.0 © 10 ¹2 J·m ¹1 before treatment, HLEBI enhanced the o Fp and o Ep up to the largest values of 11N·m ¹1 and 2.2J·m ¹1 of the laminated sheets irradiated at 0.13MGy, respectively. They were more than 55 times larger that those before treatment. On the other hand, additional HLEBI reduced the o Fp and o Ep of laminated sheets irradiated at more than 0.22 to 0.86MGy, although they were apparently larger than those before treatment. In order to investigate the influence of EB irradiation on o Fp and o Ep, 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. [doi:10.2320/matertrans.M2012124]