Salicylhydroxamic acid containing structural adhesive

Abstract

The feasibility of utilizing salicylhydroxamic acid (SHAM) as a new adhesive molecule for designing structural adhesives is investigated in this study. SHAM-containing polymers were prepared with a hydroxyethyl methacrylate (HEMA) or methoxyethyl acrylate (MEA) backbone and mixed with polyvinylidene fluoride (PVDF). PVDF was included to increase the cohesive property of the adhesive through hydrogen bond (H-bond) formation with the adhesive polymers. SHAM-containing adhesive demonstrated lap shear adhesion strength (Sadh) greater than 0.9 MPa to glass, metal, and polymeric surfaces. Adhesive formulations with elevated SHAM-content also demonstrated increased adhesive properties with Sadh values reaching as high as 4.8 MPa. Due to the physically crosslinked nature of these adhesives, formulations with extensive H-bonding resulted in strong adhesion and stability. HEMA consists of a terminal hydroxyl group with both H-bond donor and acceptor, which enabled HEMA-containing adhesives to demonstrate strong adhesion even without PVDF. On the other hand, MEA contains a methoxy group that lacks H-bond donors for forming H-bonding and MEA-containing adhesives required PVDF to provide H-bond acceptors to increase its cohesive property. An aging study was performed on the bonded joints. While the adhesive joints did not demonstrate any reduction in Sadh values over 25 days when incubated in a dry condition, Sadh values decreased by 80% over 48 h when incubated in water. This is potentially due to the hydrophilic and physically crosslinked nature of the adhesive. Nevertheless, the SHAM-containing adhesive outperformed a catechol-containing adhesive and epoxy glue and is a promising new adhesive molecule for designing structural adhesives.

Graphical abstract: Salicylhydroxamic acid containing structural adhesive

Supplementary files

Article information

Article type
Paper
Submitted
22 Apr 2024
Accepted
08 Jun 2024
First published
10 Jun 2024
This article is Open Access
Creative Commons BY-NC license

RSC Appl. Polym., 2024, Advance Article

Salicylhydroxamic acid containing structural adhesive

M. S. A. Bhuiyan, K. Wang, F. Razaviamri and B. P. Lee, RSC Appl. Polym., 2024, Advance Article , DOI: 10.1039/D4LP00139G

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