Synthesis of polyaspartate-based polymer modified with 1,4-bis(3-aminopropyl)piperazine and bromoacetic acid and its corrosion inhibition and antibacterial properties

This paper presents the synthesis of a novel polyaspartate derivative (PASP-BBA) with both corrosion inhibition and antibacterial properties. The compound is synthesised using polysuccinimide (PSI), 1,4-bis(3-aminopropyl)piperazine (BAPP) and bromoacetic acid (BA) as raw materials. By controlling the degree of polymerisation, a BAPP grafting rate of 55 % is achieved. The corrosion inhibition performance of PASP-BBA was evaluated using electrochemical methods and weight loss method. The potentiodynamic polarization results indicated that at a concentration of 70 mg/L, the corrosion inhibition efficiency of PASP-BBA was 54.28 %, which was 33.53 % higher than that of PASP. The study on the corrosion inhibition mechanism of PASP-BBA through quantum chemical calculations showed that PASP-BBA achieved this effect through physical and chemical adsorption, adhering to the surface of carbon steel and reducing the contact with corrosive media. The antibacterial performance was evaluated using filter paper method and dilution plating method. The research results indicated that PASP-BBA has selective antibacterial effects and can effectively inhibit Escherichia coli . When the concentration of PASP-BBA was 100 mg/mL, the survival rate of Escherichia coli dropped to 21 %. Meanwhile, Bacillus cereus could survive, thereby enhancing the dual functions of polyaspartic acid derivatives in corrosion inhibition and antibacterial applications. This study provides certain theoretical references for the design of green multifunctional water treatment agents.