Supporting Information
Effects of Dopamine-Containing Curing Agents on the Water Resistance
of Epoxy Adhesives
Fei Dai1, Feng Chen1, Tao Wang2, Shaoguang Feng 2, Chunlin Hu1, Xinling Wang1, Zhen
Zheng1*
1. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong
University, Shanghai 200240, P. R. China
2. Dow Chemical China Company Limited, 936 Zhangheng Road, Shanghai,
201203, P. R. China
Figure S1. Surface morphologies of epoxy adhesives with no DA (left) and adding 7.3 wt. %
DA (right) after lap shear test on steel substrates.
From the fracture images in Figure S1, we found that the interfacial interaction was
improved due to the introduction of DA which enhanced the adhesion. It is significant to
1
note that under wet condition the DA-modified epoxy perform as well as the adhesives do
under dry condition.
Figure S2. The color change caused by the complexation of DA and Fe (III) ion: a, DA/DMF;
b, Fe3+/DMF; c, DA/Fe3+/DMF.
Figure S2 shows that DA and FeCl3·6H2O in DMF are colorless and faint yellow, respectively.
But the color of the solution changes to dark-blue immediately after they are mixed. It
indicates the coordination reaction between DA and Fe3+.
2