Interfacial Structure Control and Three-Dimensional X-ray Imaging of an Epoxy Monolith Bonding System with Surface Modification

Abstract

A monolith bonding system has a high reliability for dissimilar material bonding. The epoxy monolith layer fabricated on a substrate guarantees bond strength by the anchor effect, regardless of the compatibility of the used materials. Designing a high-performance monolith bonding system requires the suppression of an interfacial failure between the monolith and the substrate. In this study, silane and phosphine coupling agents containing amino and epoxy groups were used to construct a robust interfacial structure between the monolith and the substrates such as glass and metals. The internal and interfacial monolith structures were characterized by three-dimensional X-ray imaging as a nondestructive observation method in addition to the scanning electron microscopy of the sample cross sections. The modification of the substrate−monolith interface using the coupling agents improved the strength of dissimilar material bonding of the glass and metal substrates in combination with thermoplastic resins such as poly(ethylene terephthalate) and polycarbonate bisphenol-A.

Small Angle X‐Ray Scattering Study for Investigating the 3D Packing Structure of Pt Catalysts on Gd‐Doped CeO2 Supports for Fuel Cells

“…Many analysis methods, mainly for 3D structures obtained by computed tomography, [25][26][27][28][29] have been proposed for evaluating quantitative features of such complex structures. Typically, the observed image is transformed to binary data that assigns grid point values (GPV) to their pixels; for example, an inside object (particle) is set to 0, and an outside object (pore) is set to 1.…”

Preparation of Porous Epoxy Resin Materials by Reaction-Induced Phase Separation Regulated Using Fumed Silica

“…proposed a dissimilar material bonding method for various polymers and metals coated with the porous structure epoxy monolith . On the basis of Sugimoto’s experiments, Sakata et al investigated the internal and interfacial structures of the epoxy monolith fabricated on the surface-modified substrates by 3D X-ray imaging and SEM observation . Tominaga et al prepared cocontinuous network polymers (CNP) by filling continuous pores in an epoxy monolith (EM) with a cross-linked acrylate polymer .…”

“…16 On the basis of Sugimoto's experiments, Sakata et al investigated the internal and interfacial structures of the epoxy monolith fabricated on the surface-modified substrates by 3D X-ray imaging and SEM observation. 17 Tominaga et al prepared cocontinuous network polymers (CNP) by filling continuous pores in an epoxy monolith (EM) with a cross-linked acrylate polymer. 18 The process can be divided into two steps: first, the phase separation between the polymer components and pore-causing components is induced by chemical reactions, and then, porous polymer materials can be obtained by removing the pore-causing components after the system is cured.…”

Microporous Structure Formation of Poly(methyl methacrylate) via Polymerization-Induced Phase Separation in the Presence of Poly(ethylene glycol)

“…Microstructure formation using phase separation has been investigated in a variety of materials. For example, the curing of the epoxy resin in the presence of poly­(ethylene glycol) (PEG) leads to a co-continuous monolith structure. , The epoxy monolith has been applied for separation technologies, , multi-material bonding, − and novel tough co-continuous network materials …”