Effects of Electron Beam Irradiation on Shear Strength of Laminated Sheet of Bio-Adaptable Polydimethylsiloxane (PDMS) and Polytetrafluoroethylene (PTFE) with Fracture Toughness

Abstract

Effects of homogeneous low voltage electron beam irradiation (HLEBI) without glue on the adhesive force of tensile shear strength (¸B) at each shear probability (P s ) of laminated PDMS/PTFE sheets of polydimethylsiloxane (PDMS) and Polytetrafluoroethylene (PTFE) were investigated. Although¸B of shear at low and mid P s of 0.06 and 0.50 were 0.015 and 0.04 MPa before treatment, 0.22 MGy-HLEBI enhanced the¸B up to the largest values of 0.098 and 0.11 MPa of the laminated sheets, respectively. They were more than 6 and 3 times larger than those before treatment. On the other hand, additional HLEBI apparently reduced the¸B of laminated sheets irradiated at more than 0.43 MGy as usual radiation damages. The effects of HLEBI on adhesion force of¸B can be explained by the enhancement of cross-linking at PDMS/PTFE interface. When HLEBI cut the chemical bonds and generated active terminated atoms with dangling bonds at cross-linked PDMS and PTFE polymers, strengthening the bonding force of cross-linking polymers was induced by the chemical bonding and intermolecular attractive force.

Electron irradiation enhanced wear resistance and hardness of polytetrafluoroethylene (PTFE)

“…To break covalent bonds in PTFE molecules, ionizing rays, such as electron beams, can be used as many studies have shown that electron beam irradiation on PTFE at high temperature is an effective modification method through breaking the covalent bonds. [18][19][20][21] Oshima et al used electron beam irradiation to improve the radiation resistance of PTFE. 22 Ignat'eva et al studied the infrared spectra of PTFE before and after irradiation, and explained the mechanism of the PTFE crosslinking reaction, confirming that electron beam irradiation can break the covalent bonds of PTFE molecules.…”

Adhesive-free adhesion between heat-assisted plasma-treated fluoropolymers (PTFE, PFA) and plasma-jet-treated polydimethylsiloxane (PDMS) and its application

“…Moreover, both adhesive bonding and adhesive-free adhesion between PDMS and other types of materials (resins such as PMMA, PP, and PE 25–27 ; metals such as Cu, Fe, Pt, Au, and Al 27,28 ; and glass 28–30 ) were also reported. However, these articles rarely reported on adhesion between PDMS and fluoropolymers, or the adhesion strength between PDMS and PTFE was too low for practical use 27,31,32 . In medical and food industries, adhesives are unlikely to be employ because they are regarded as contaminations.…”

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.…”