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Synthesis and investigation of superabsorbent polymer networks based on AMPS and VPA monomers
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DOI：10.1007/s00289-026-06633-w.png)
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Abstract
En 中文
This study investigates the synthesis and characterization of superabsorbent polymer networks based on 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and vinyl phosphonic acid (VPA) monomers, crosslinked with ethylene glycol dimethacrylate (EGDMA) or N, N′-methylenebisacrylamide (MBA). The networks exhibit tunable swelling behavior, mechanical properties, and thermal stability, influenced by monomer composition, crosslinker type, and synthesis conditions. Key findings reveal that AMPS-rich hydrogels (e.g., VE30) demonstrate exceptional pH-responsive swelling (46.6 g/g at pH 3), while VPA incorporation enhances thermal stability, yielding up to 25% char residue at 800 °C. MBA-crosslinked networks (VN series) exhibit superior mechanical strength (storage modulus ~ 1420 Pa) and crosslink density (4.84 × 10⁻⁴ mol/cm³) compared to EGDMA-based counterparts, attributed to MBA’s rigid structure. Remarkably, the hydrogels maintain significant absorption in alcoholic solvents (up to 22.5 g/g in methanol), highlighting their dual hydrophilic/organophilic character. Systematic optimization of parameters including VPA content (30–70 mol%), crosslinker concentration (1–3 mol%), and water volume (3–7 mL), enables precise control over gelation kinetics, swelling capacity, and network robustness. These insights advance the design of next-generation superabsorbents for applications ranging from wastewater treatment to drug delivery, particularly in harsh or multifunctional environments.
Keywords:
Superabsorbent polymers
Functional monomer-based networks
pH-responsive hydrogels
Thermal stability
Crosslinker effect
Alcogels
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