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)

Abstract

2-layer laminated sheets (PU/PET) with Polyurethane (PU) and Polyethylene Terephthalate (PET) were prepared by a new adhesion method, a double-step treatment consisting of applying low dose (≦ 1.72 MGy) homogeneous low energy electron beam irradiation (HLEBI) prior to hot-press under 3 MPa and 348 K. Although the weak hot-press adhesion of the PU/PET was observed without HLEBI, the new adhesion mostly raised the bonding energy as evidenced by the mean adhesive energy of peeling resistance ( o E p ). Based on the 3-parameter Weibull equation, the lowest o E p value at peeling probability (P p ) of zero (E s ) could be estimated. An increasing trend in E s occurred by the double-step treatment applying HLEBI up to 1.29 MGy reaching a maximum at 1.83 kJ·m, improving the safety level without radiation damage. When HLEBI cut the chemical bonds in PU and generated terminated atoms with dangling bonds, they probably induced the chemical bonding. Therefore, increasing adhesion energy between the laminated sheets could be explained.

Effects of Irradiation Dose of Sheet-Like Electron Beam and its Cathode Voltage on Impact Strength of Carbon Fiber Reinforced Thermoplastic Polyamide just before Shipping

“…EB-irradiation has had a positive track record improving properties of wetting 10) , mist resistance [11][12][13][14], polymer adhesion [15][16][17][18][19][20][21][22][23][24], sterilization [25], conductivity [26] and strength [3,4,6,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] of many materials including: CF [3,4], silicate glasses [27][28][29][30][31][32], polymers [6,[35][36]…”

Surface Modification and Adhesion Mechanism of Isotactic Polypropylene with Low-Energy Electron-Beam Treatments

“…28−33 Therefore, low-energy EB treatment has a large potential not only in conventional applications, such as curing and sterilization, 22,34−37 but also in the adhesion field. 28,29,38,39 For further development of EB surface treatments, a detailed comprehension on the effect of EB irradiation on adhesion enhancement and its mechanism is required.…”

“…The effect of EB irradiation on the polymer surface has been revealed. Recently, the development of EB equipment has resulted in its downsizing, and lower-power source and experiments at laboratory are available. − Therefore, low-energy EB treatment has a large potential not only in conventional applications, such as curing and sterilization, ,− but also in the adhesion field. ,,, For further development of EB surface treatments, a detailed comprehension on the effect of EB irradiation on adhesion enhancement and its mechanism is required.…”