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Double Photocrosslinked Responsive Hydrogels Based on Hydroxypropyl Guar.

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New biodegradable hydrogels with dual crosslinking offer enhanced elasticity and pH-responsive properties. These smart materials show promise for controlled release applications, such as drug delivery coatings.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Biodegradable polymers are crucial for advanced material applications.
  • Hydrogels offer versatile platforms for controlled substance release.
  • Developing stimuli-responsive materials is key for smart applications.

Purpose of the Study:

  • To synthesize and characterize double crosslinked hydrogels using photocopolymerization.
  • To investigate the impact of labile boronate crosslinks on hydrogel properties.
  • To evaluate the pH-controlled release capabilities of the developed hydrogels.

Main Methods:

  • Photopolymerization of methacrylated hydroxypropyl guar (HPG-MA) and 3-acrylamidophenylboronic acid.
  • Formation of both covalent and labile boronate crosslinks.
  • Mechanical testing to assess elasticity and swelling behavior.
  • pH-dependent substance uptake and release studies.

Main Results:

  • The double crosslinked hydrogels exhibited superior elasticity compared to solely covalently crosslinked counterparts.
  • Labile boronate crosslinks enhanced hydrogel strength and introduced responsiveness.
  • Mechanical properties and swelling behavior were significantly influenced by pH.
  • Controlled release of a cationic disinfectant was demonstrated, regulated by pH.

Conclusions:

  • Double crosslinked hydrogels based on HPG-MA and phenylboronic acid offer tunable mechanical and responsive properties.
  • The pH-responsive nature of these hydrogels enables controlled substance release.
  • These photocrosslinkable, in situ forming hydrogels are highly promising for smart coating applications.