The synthetic methods of the hindered phenol with alcoholic
hydroxyl (GM-ME) and two macromolecular hindered phenol antioxidants
containing thioether and urethane groups (GM-ME-IPDI,
GM-ME-TDI) are described below. The chemical structures and
synthetic routes of GM-ME, GM-ME-IPDI and GM-ME-TDI are
showed in Fig. 1. All the processes were carried out in nitrogen
atmosphere.