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<p>The development of high-performance temporary plugging agents (TPAs) with precisely tunable properties is crucial for efficient reservoir stimulation. In this study, smart poly (acrylic acid–acrylamide) [P(AA–AM)] hydrogels were strategically fabricated using dynamic zinc-ion (Zn²⁺) coordination as a versatile crosslinking mechanism. A series of hydrogels were synthesized via free-radical polymerization in aqueous solution with varying Zn²⁺ concentrations. The coordination structure was confirmed by Fourier transform infrared (FTIR) spectroscopy. The results demonstrate that Zn²⁺ concentration serves as a powerful tuning parameter, exerting a nonlinear influence on the hydrogel properties. An optimal Zn²⁺ concentration of 2 wt% yielded a hydrogel with a well-balanced network structure, exhibiting a high water absorption capacity of 260&#xa0;g·g⁻¹ at 40&#xa0;°C, a compressive strength of 25&#xa0;kPa, a controlled dissolution time of 27&#xa0;h at 70&#xa0;°C, and a post-dissolution viscosity of 60 mPa·s. This work elucidates the fundamental relationship between coordination-induced crosslinking density and macroscopic performance, providing a robust design strategy for intelligent temporary plugging materials that combine excellent plugging performance with predictable and controllable degradation behavior.</p>

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Performance-tunable poly (acrylic acid-acrylamide) hydrogels via dynamic zinc-ion coordination for application as temporary plugging agents

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Dingjun Zhang,
  • Yanzhen Li,
  • Pengcheng Wang,
  • Zhandong Luo,
  • Xueping Zhou,
  • Yueting Jiao

摘要

The development of high-performance temporary plugging agents (TPAs) with precisely tunable properties is crucial for efficient reservoir stimulation. In this study, smart poly (acrylic acid–acrylamide) [P(AA–AM)] hydrogels were strategically fabricated using dynamic zinc-ion (Zn²⁺) coordination as a versatile crosslinking mechanism. A series of hydrogels were synthesized via free-radical polymerization in aqueous solution with varying Zn²⁺ concentrations. The coordination structure was confirmed by Fourier transform infrared (FTIR) spectroscopy. The results demonstrate that Zn²⁺ concentration serves as a powerful tuning parameter, exerting a nonlinear influence on the hydrogel properties. An optimal Zn²⁺ concentration of 2 wt% yielded a hydrogel with a well-balanced network structure, exhibiting a high water absorption capacity of 260 g·g⁻¹ at 40 °C, a compressive strength of 25 kPa, a controlled dissolution time of 27 h at 70 °C, and a post-dissolution viscosity of 60 mPa·s. This work elucidates the fundamental relationship between coordination-induced crosslinking density and macroscopic performance, providing a robust design strategy for intelligent temporary plugging materials that combine excellent plugging performance with predictable and controllable degradation behavior.