Two kinds of water-soluble fluorescent hyperbranched poly(amino esters) were first synthesized by a convenient one-pot approach via the A2 + B3 Michael addition reaction of trimethylolpropane triacrylate and aliphatic diamines. Their structures and optical properties were determined by FTIR, NMR, GPC, UV-vis, and fluorescence spectra. The hyperbranched poly(amino esters) in aqueous solutions and PVA films state showed strong blue fluorescence when these polymers were excited by a UV lamp. In addition, it was found that their fluorescence exhibited a pH-dependent behavior. It was also noteworthy that the fluorescence could be changed by adding metal ions. The fluorescence of the polymer could be quenched when the concentration of Hg2+ and Fe3+ reached at 10−2 mol L−1. Therefore, the prepared hyperbranched poly(amino ester) is a promising ion probe for detecting Hg2+ and Fe3+.
Ureidopyrimidinone-containing Poly(amino ester) (UPy-D400-PEGDA) was synthesized by the Michael addition reaction of Poly(ethylene glycol) diacrylate and polyether amine grafted 2-ureido-4[1H]-pyrimidinone motifs, and its corrosion inhibition efficiency on Q235 steel in 1 mol/L HCl medium was studied by polarization curve and electrochemical impedance spectroscopy , as well as corrosion product analysis. UPy-D400-PEGDA is a mixed-typed corrosion inhibitor that mainly suppressed the cathode, can form a protective film on the surface of mild steel to suppress the corrosion of oxygen and chlorine in acid medium. Corrosion inhibition efficiency was gradually enhanced with the increase of the concentration of UPy-D400-PEGDA. The corrosion inhibition efficiency reaches 98.80% when the inhibitor concentration is 500 mg/L. The surface roughness of mild steel in 1 mol/L HCl solution without UPy-D400-PEGDA was 3.891 μm, while the roughness of mild steel with UPy-D400-PEGDA concentration of 500 mg/L was only 0.636 μm. The inhibition mechanism was elucidated using quantum chemical calculation.
Poly(amino ester)s (PAEs) are widely employed in diverse applications, particularly biomedicine, owing to their tunable functionality via amine group modification and the inherent biodegradability and biocompatibility of their polyester chains. Herein, we reported (thio)urea/base-catalyzed ring-opening polymerization of proline-based lactones for well-defined poly(amino ester)s. A series of (thio)ureas and organic bases were synthesized and combined to form various binary organocatalysts to explore the structure-activity relationships. Monomer conversion up to 95 % was achieved within 5 min. Kinetics studies and chain extension experiments confirmed the living/controlled nature of ROP. Four well-defined PAEs with high molecular weights (3150–51,340 g mol −1 ) and narrow dispersity ( Đ < 1.29) were produced. The resultant PAEs showed high thermal stability ( T d,5% = 224–350 °C) and T m (189–244 °C). Furthermore, seven cationic random or block copolymers were synthesized through ring-opening copolymerization, followed by deprotection reaction. The effect of copolymer composition on the self-assembly behavior was investigated by DLS and TEM. Cationic random copolymers with high hydrophobic content demonstrated strong antimicrobial activity against E. coli, while those with high hydrophilic content were more active against S. aureus . This work would provide valuable insights into poly(amino ester)s and cationic polymers with tailored antimicrobial activity.
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