Preparation of amino-functionalized graphene oxide by Hoffman rearrangement and its performances on polyacrylate coating latex

Amino-functionalized graphene oxide (NGO) was prepared by Hoffman rearrangement where carboxyl group was replaced directly by amino group instead of using long-chain containing amino group. The chemical structure of NGO was studied by FT-IR, UV-vis, Raman, XPS and TGA. NGO was incorporated into polyacrylate latex (PA) by blending to prepare PA/NGO composite. The dispersibility of NGO in PA latex was significantly influenced by pH values. When the pH value was higher than 6, NGO uniformly dispersed in PA. The mechanical properties of the PA/NGO film were relayed on the pH. The break strength of the film was increased from similar to 2 MPa to similar to 5 MPa but the elongation at break decreased from 475% to 258% compared with those of PA film. The glass transition temperature (T-g) of PA/NGO film increased by 3.48 degrees C. For the sake of comparison, the mechanical properties and T-g of a similar composite but with bare graphene oxide (PA/GO) are presented. (C) 2016 Elsevier B.V. All rights reserved.