The main aim of the present study is the analysis of the structural, chemical, and thermal properties of urea-succinic acid-ethylene glycol (U/SA/EG) and urea-succinic acid-glycerol (U/SA/GLY) copolymers produced in aqueous solutions with different compositions. These materials find potential use in agricultural applications. The copolymers were characterized by Fourier transform infrared spectroscopy (ATR-FTIR), matrix-assisted laser desorption ionization process (MALDI TOF), nuclear magnetic resonance (NMR), and thermal gravimetric analysis (TGA/DTG). The obtained results indicate that the use of ethylene glycol and glycerol as comonomers can improve some of the final copolymer properties, leading to increase of the copolymer thermal stability and increase of the average molecular weights. However, addition of glycerol in excess can reduce the thermal stability of the final resin. Additionally, it is shown that ethylene glycol and glycerol can also act as chain transfer agents, also allowing for chain branching. POLYM. ENG. SCI., 58:1575-1582, 2018. (c) 2017 Society of Plastics Engineers