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High-strength, thermosensitive double network hydrogels with antibacterial functionality.

Xuefeng Li1, Yonglin Wang2, Dapeng Li3

  • 1Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China. li_xf@mail.hbut.edu.cn and Collaborative Innovation Centre of Green Light-weight Materials and Processing, Hubei University of Technology, Wuhan 430068, China.

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Summary
This summary is machine-generated.

We developed strong, thermosensitive double network hydrogels using poly(N-isopropyl acrylamide) (PNIPAM) and poly(2-acrylamido-2-methylpropanesulfonic acid sodium salt) (PNaAMPS). These biocompatible, antibacterial hydrogels show tunable mechanical properties and temperature-dependent swelling for biomedical uses.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Developing advanced hydrogels with enhanced mechanical strength and tunable properties is crucial for biomedical applications.
  • Thermosensitive hydrogels offer unique potential due to their response to temperature changes.
  • Existing hydrogels often face limitations in balancing mechanical robustness with specific functionalities.

Purpose of the Study:

  • To fabricate strong and thermosensitive double network (T-DN) hydrogels based on poly(N-isopropyl acrylamide) (PNIPAM).
  • To investigate the influence of NIPAM integration on mechanical properties, thermosensitivity, and biocompatibility.
  • To explore the potential for antibacterial functionality through crystal violet loading.

Main Methods:

  • Fabrication of T-DN hydrogels by interpenetrating rigid poly(2-acrylamido-2-methylpropanesulfonic acid sodium salt) (PNaAMPS) and soft poly(N-isopropyl acrylamide-co-acrylamide) (P(NIPAM-co-AAm)).
  • Incorporation of NIPAM as an adjustor for elastic modulus, hydrophilicity, and thermosensitivity.
  • Mechanical testing, swelling studies, cell viability assays, and antibacterial testing against E. coli.

Main Results:

  • Achieved excellent mechanical properties (0.83-1.37 MPa) in the PNaAMPS/P(NIPAM-co-AAm) T-DN hydrogels.
  • Demonstrated desirable temperature-dependent swellabilities and good biocompatibility with high cell survival rates.
  • Successfully imparted antibacterial functionality using crystal violet loading against E. coli.

Conclusions:

  • The double network construction strategy effectively produces strong, thermosensitive, and biocompatible hydrogels.
  • Tunable mechanical properties and temperature-dependent swelling are achievable by adjusting NIPAM content.
  • These T-DN hydrogels show promise for high-strength, antibacterial applications in various biomedical fields.