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The effects of homogeneous low energy (170 keV) electron beam irradiation (HLEBI) on the adhesion force indicated by peeling resistance (Fp) at each accumulative probability of peeling resistance (Pp) of laminated sheets of carbon fiber reinforced epoxy polymer (CFRP) and polytetrafluoroethylene (PTFE) were investigated. The slight detectable adhesive force of Fp before treatment were 0.3 and 7.6Nm11 at low and mid Pp of 0.06 and 0.50, respectively, since the intermolecular attractive force exists at PTFE and epoxy polymers at cross-linking zone. Although additional dose of HLEBI apparently reduced the Fp of laminated sheets irradiated at more than 0.30MGy as usual radiation damages, small dose of 0.04 to 0.22MGy-HLEBI increased the adhesive force of peeling (Fp) substantially over the untreated. 0.13MGy-HLEBI enhanced the Fp up to the largest values of 9.8 and 44.0Nm11, respectively, which were more than 30.5 and 5.8 times larger than those before treatment. Based on the 3-parameter Weibull equation, the statistically lowest Fp value at Pp = 0 (Fs) was increased from zero to 9.2Nm11 by applying the 0.13MGy HLEBI. XPS (X-ray photoelectron spectrometry) measurements detected the fluorine (1s) signal on peeled surface of CFRP side indicating the residual PTFE adhered well to the epoxy of CFRP by the HLEBI. Thus, the fracture probably propagated through the PTFE inside near cross-linking zone of interface. This is probably a result of adhesion force of PTFE/CFRP being made stronger than the cohesive force of epoxy polymer. When HLEBI cut the chemical bonds and generated active terminated atoms with dangling bonds of Epoxy and PTFE polymers in cross-linking zone with chemical bonding around adhesive interface, strengthening the adhesive force indicated by Fp was mainly induced by the chemical bonding, as well as intermolecular attractive force in cross-linking polymers. [doi:10.2320/matertrans.MAW201508]

materials transactions

Effects of Homogeneous Low Energy Electron Beam Irradiation (HLEBI) on Adhesive Force of Peeling of Carbon Fiber Reinforced Epoxy Polymer (CFRP) and Polytetrafluoroethylene (PTFE)