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Related Experiment Video

Updated: May 21, 2025

Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Nanoporous Bisphenol A-Based Polymeric Network Featuring Spontaneous Microphase-Separation Enables Transparent

Wenqing Zhao1, Jiawei Qin2, Yaoyu Xiao3

  • 1State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, Liaoning key Laboratory of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.

ACS Applied Materials & Interfaces
|March 21, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a novel, cost-effective method for creating transparent, multifunctional hydrogels using click chemistry. The resulting materials exhibit enhanced mechanical properties, tunable porosity, and antibacterial and sensing capabilities for diverse applications.

Keywords:
amine−epoxy “click” chemistrybisphenol A diglycidyl ether (BADGE)microphase-separationmultifunctional hydrogelstransparency

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Multifunctional hydrogels are highly sought after but face challenges in preparation complexity and raw material costs.
  • Existing methods often lack precise control over cross-linking density and material properties.

Purpose of the Study:

  • To develop a versatile, cost-effective, and simplified approach for synthesizing multifunctional hydrogels.
  • To investigate the structure-property relationships of novel hydrogels with tunable porosity and enhanced functionalities.
  • To demonstrate the potential applications of these hydrogels as soft actuators and in sensing.

Main Methods:

  • Employed catalyst-free amine-epoxy "click" chemistry between bisphenol A diglycidyl ether (BADGE) and poly(ethylene glycol) diglycidyl ether (PEGDGE) with 3-amino-1-propanol.
  • Incorporated hydrophilic 1,3-propane sultone (1,3-PS) for increased water content, followed by one-pot cross-linking with hexamethylene diisocyanate (HDI).
  • Utilized a two-step cross-linking strategy for precise control over cross-linking density and preparation.

Main Results:

  • Achieved in situ microphase-separated porous hydrogels (PBA50PEG50PU-PS) with nanosized pores (~100 nm), high transparency (87.9%), and superior mechanical properties.
  • Demonstrated tunable transparency (89.7%) and reduced pore size (~50 nm) after water absorption/loss cycles due to solvent-induced self-assembly.
  • Developed a "Janus" soft actuator using bilayer hydrogels (WPBA90PEG10PU-PS and WPBA50PEG50PU-PS) for underwater grasping and humidity-responsive switches.
  • Incorporated glycerol (Gly) and sodium ions (Na+) into WPBA50PEG50PU-PS/Gly67 for enhanced environmental stability, frost resistance, tensile strength, and conductivity.
  • Introduced quaternary ammonium salt and sulfobetaine via 1,3-PS, imparting antibacterial and sensing capabilities to the final multicomponent hydrogel (WPBA50PEG50PU-PS/Gly67/Na10).

Conclusions:

  • A versatile and efficient method for preparing transparent, multifunctional hydrogels with tunable properties has been established.
  • The developed hydrogels show significant potential for applications in soft robotics, actuators, and advanced sensing technologies.
  • The incorporation of specific additives and chemical moieties leads to enhanced stability, conductivity, and biological functionalities.