Affiliation:
1. Key Lab of Structures Dynamic Behaviour and Control, Ministry of Education Harbin Institute of Technology Harbin China
2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China
3. School of Civil Engineering Harbin Institute of Technology Harbin China
Abstract
AbstractThis study explores the applicability of a tannic acid‐based (TA‐AGE) additive to improve interfacial bond durability of a structural epoxy (Ep.) adhesive for underwater applications. A modified epoxy M(Ep.) was prepared from Ep. by incorporating 1 wt% (optimized) TA‐AGE additive. Although the cohesive properties of Ep. were slightly affected by the modification, underwater adhesion was improved. Incorporation of TA‐AGE additive in the adhesive can strengthen the interfacial bonds by forming more noncovalent interactions with the adherend surface. In addition, a 6‐month durability study in distilled water at 20°C, 40°C, and 60°C was performed to study the effect of water uptake on the evolution of viscoelastic, tensile properties and interfacial bond durability of Ep. and M(Ep.). With aging, the tensile properties of M(Ep.) degraded more rapidly than Ep. due to higher water uptake. Steel joints bonded with M(Ep.) in air, but cured underwater, had strength retention of 97%, 99% and 107% in 20°C, 40°C, and 60°C water, respectively, after 6‐month aging. Meanwhile, joints prepared underwater with M(Ep.) had a strength retention of 77% in 20°C water. Joint strength retention (%) in both cases was significantly higher than Ep. bonded joints aged under similar conditions.
Funder
National Key Research and Development Program of China
Subject
Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry