Issue 36, 2022

Kinetics of the interfacial curing reaction for an epoxy–amine mixture

Abstract

A better understanding of the chemical reaction between epoxy and amine compounds at a solid interface is crucial for the design and fabrication of materials with appropriate adhesive strength. Here, we examined the curing reaction kinetics of epoxy phenol novolac and 4,4′-diaminodiphenyl sulfone at the outermost interface using sum-frequency generation spectroscopy, and X-ray and neutron reflectivity in conjunction with a full atomistic molecular dynamics simulation. The reaction rate constant was much larger at the quartz interface than in the bulk. While the apparent activation energy at the quartz interface obtained from an Arrhenius plot was almost identical to the bulk value, the frequency factor at the quartz interface was greater than that in the bulk. These results could be explained in terms of the densification and orientation of reactants at the interface, facilitating the encounter of the reactants present.

Graphical abstract: Kinetics of the interfacial curing reaction for an epoxy–amine mixture

Supplementary files

Article information

Article type
Communication
Submitted
24 iyl 2022
Accepted
02 sen 2022
First published
03 sen 2022

Phys. Chem. Chem. Phys., 2022,24, 21578-21582

Author version available

Kinetics of the interfacial curing reaction for an epoxy–amine mixture

K. Yamaguchi, D. Kawaguchi, N. Miyata, T. Miyazaki, H. Aoki, S. Yamamoto and K. Tanaka, Phys. Chem. Chem. Phys., 2022, 24, 21578 DOI: 10.1039/D2CP03394A

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