Neutron Reflectometry Study on the Interfacial Layer of Epoxy Resin To Improve Adhesion Strength

Area of Science:

• Materials Science
• Polymer Chemistry
• Surface Science

Background:

• Adhesive performance is critically dependent on the interface between adhesive and adherend.
• Tailoring interfacial properties is key to improving structural bonding.

Purpose of the Study:

• To develop a nanometrically stable interfacial layer for epoxy adhesives.
• To enhance adhesive performance through molecular-level interface engineering.

Main Methods:

• Formation of an interfacial layer from an epoxy resin with excess hardener.
• Neutron reflectometry for structural analysis under varying humidity.
• FT-IR spectroscopy to identify unreacted functional groups.
• Lap shear tests to evaluate adhesive strength.

Main Results:

• A stable, nanometric interfacial layer was successfully developed.
• The layer demonstrated excellent structural integrity and suppressed moisture ingress.
• Unreacted amino groups in the layer facilitated further curing.
• Adhesion strength nearly doubled with the introduction of the interfacial layer.

Conclusions:

• A homologous material system can effectively tailor interfacial properties.
• This approach enhances epoxy adhesive performance without external additives.
• The strategy offers a scalable method for reliable, improved bonding.