Adhesive Resistance to Peeling Force of PTFE/PDMS Laminated Sheet Assisted by Homogeneous Low Voltage Electron Beam Irradiation at 77 K

Abstract

¹1 at low P p (0.06) at 77 K, indicator of high industrial reliability of production process, was 0.33 MGy, which was more than 3.7 times broader than that at 298 K. Based on the 3-parameter Weibull equation, the lowest o F p value at P p of zero (F s ) could be estimated. The 0.22 MGy-HLEBI at 77 K apparently improves the F s , which was higher than that 0.22 MGy-HLEBI at 298 K. Decreasing the irradiation temperature from 298 to 77 K controlled the rapid adhesion and rapid decay of adhesion at low-P p , which were mainly caused by the low forming ability of dangling bonds induced by strong apparent bonding force, which is related to decreasing atoms vibration energy. Since the 0.22 MGy-HLEBI at 77 K controlled the recovery of dangling bonds and generated the chemical bonds, the strong adhesive force of PTFE/PDMS treated by 0.22 MGy-HLEBI at 77 K could be explained. Therefore, HLEBI under liquid nitrogen was useful tool for quick strong PTFE/PDMS lamination with sterilization for bio-adaptable application.

Adhesion of Polyethylene/Polyethylene Terephthalate (PE/PET) Laminated Sheets by Homogeneous Low Potential Electron Beam Irradiation (HLEBI) Prior to Assembly and Hot-Press above Melting Point

“…The PE/PET laminated sheets were irradiated by using an electron-curtain processor (Type CB250/30/20 mA, Energy Science Inc., Woburn, MA, Iwasaki Electric Group Co. Ltd. Tokyo) 8,[11][12][13][14] prior to hot-press. The specimen was homogeneously irradiated with the sheet HLEBI with low energy through a titanium thin lm window attached to a 550 mm diameter vacuum chamber.…”

“…8) Improvements are mainly caused by the irradiation with the formation of dangling bonds at terminated atoms in polymers. 9) Dangling bonds enhance the surface energy, which is probably the mechanism for joining the different polymers.…”

Effects of Homogeneous Low Energy Electron Beam Irradiation (HLEBI) on Adhesive Energy of Peeling Resistance of Laminated Sheet with Polyurethane (PU) and Polyethylene Terephthalate (PET)

“…8,[16][17][18][19] The specimen was homogeneously irradiated with the sheet HLEBI with low energy through a titanium thin lm window attached to a 240 mm diameter vacuum chamber. A tungsten lament in a vacuum is used to generate the electron beam at a low energy (acceleration potential, V: kV), of 170 keV and irradiating current density (I, A/m 2 ) of 0.089 A/m 2 .…”

“…5) HLEBI has been found to increase adhesive mechanical properties of polymer-polymer joints for biomedical applications of PDMS (polydimethylsilozane)/PTFE, 6) PDMS/ PP (polypropylene), 7) and create strong adhesion in the difcult to bond PTFE/PE (polyethylene). 8) Improvements are mainly caused by the irradiation with the formation of dangling bonds at terminated atoms in polymers. 9) Dangling bonds enhance the surface energy, which is probably the mechanism for joining the different polymers.…”

Adhesive Force Improvement of Polyethylene Terephthalate (PET)/Epoxy Resin Joint by Electron Beam to PET Prior to Assembly

“…5) HLEBI has been found to increase adhesive mechanical properties of polymer-polymer joints for biomedical applications of PDMS (polydimethylsilozane)/ PTFE, 6) PDMS/PP (polypropylene), 7) and create strong adhesion in the difficult to bond PTFE/PE (polyethylene). 8) Increase in adhesion by EB is reported to occur by crosslinking between the two polymer surfaces as in rubbers 9) and polyurethane (PU) based adhesives, 10) and dangling bond generation: scission of bonds detected by electron spin resonance (ESR) creating reactive sites in PDMS/PP. 7) In the 1950s Charlesby-Pinner derived an expression for crosslink density as a function of radiation dose dependent on sol fraction, fracture density of main chain scission per unit dose, and initial number average degree of polymerization.…”