Effects of Electron Beam Irradiation on Bending Strength of Glass Fiber Reinforced Epoxy Polymer (GFRP) Thick Sheet Treated by Silane Coupling

Abstract

Effects of silane coupling treatment and electron beam (EB) irradiation on bending test of glass fiber reinforced epoxy polymer (GFRP) thick sheet were studied. EB irradiation increased the bending strength and its strain of GFRP thick sheet with silane coupling treatment. EB irradiation also enhanced the apparent hardening modulus (ds/de) of bending deformation and increased the deformation energy of GFRP thick sheet with silane coupling treatment. The deformation energy depends on the strain improvement at the maximum bending stress of epoxy resin and glass fiber and the interfacial friction force.

Improving Impact Value of Interlayered Glass Fiber Chopped Strand Mat Reinforced Thermoplastic Polypropylene Externally Irradiated by Homogeneous Low Potential Electron Beam

“…5, dangling bonds are not detected in pure PP sheet before treatment. On the other hand, applying the small HLEBI dose enhances the density of dangling bonds, and then increases mechanical properties in inorganic glass 4,6,7) and often enhances ductility and strengthening of polymer matrix 9,10) and other GFRPs. 5,[9][10][11] In addition, HLEBI is also reported to generate dangling bonds in silica glass.…”

“…1 and Fig. 4, external [5][6][7][8][10][11][12][13][14][15][16] and internal 9) HLEBI activation fabrication processes of [PP] 6 [GF-CSM] 5 CSM-CFRTP are different. Since strengthening GFRP bulk has been suggested and developed to reinforce the GF/PP interface adhesion by the internal HLEBI activation of GFs prior to dipping in the PP (see broken lines in Fig.…”

“…4) Moreover, HLEBI has improved the bending strength of CFRP, 6) as well as bending fracture energy of GFRP. 7) Our recent research has shown HLEBI enhances Charpy impact strength of thermohardened epoxy matrix-GFRP. 8) Thermoplastic GFRTPs, notably, already applied for automobile bumper and IC (integrated circuit) substrates, can be easily produced with high productivity for mass production by various forming process.…”

“…To do this, one method that has been gaining momentum is low potential 100-keV class electron beam irradiation (HLEBI). [1][2][3][4][5][6][7][8] HLEBI has a proven track record of increasing desirable properties such as hardening, wear resistance, mist resistance and sterilization for practical use of polymer. [1][2][3] A small dose of HLE-BI often enhances deformation resistivity (elasticity) of silicate glasses.…”

“…[5][6][7][8][10][11][12][13][14][15][16] Conventional method of HLEBI to outside surfaces after molding and shaping has resulted in improvements and high reproducibly of mechanical properties in both GF and polymer, as well as enhancingber/polymer interface adhesion. This is despite HLEBI penetration depth, D th being on the order of about 166 μm into specimen thickness for typical GFRP and CFRPs.…”