Superporous IPN hydrogels having enhanced mechanical properties

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Chemistry

Background:

• Superporous hydrogels (SPHs) are promising for oral drug delivery but often lack sufficient mechanical strength.
• Gastric retention devices require robust materials to withstand physiological conditions.

Purpose of the Study:

• To enhance the mechanical properties of superporous hydrogels (SPHs) for improved gastric retention devices.
• To develop superporous interpenetrating polymer network hydrogels (SPIHs) with superior mechanical performance.

Main Methods:

• Incorporation of a second polymer network, polyacrylonitrile, into the SPH structure to form an interpenetrating polymer network (IPN).
• Characterization of mechanical properties (compression strength, elasticity) and swelling behavior.
• Evaluation of scaffold-like fiber network formation within the SPH cell walls.

Main Results:

• Mechanical properties, including compression strength and elasticity, were improved up to 50-fold compared to control SPHs.
• Enhanced mechanical properties are attributed to scaffold-like fiber network structures within the SPH cell walls.
• Fast swelling properties were maintained due to the preservation of interconnected pore structures.

Conclusions:

• Superporous interpenetrating polymer network hydrogels (SPIHs) exhibit significantly improved mechanical strength.
• The enhanced SPIHs are suitable for developing robust gastric retention devices for long-term oral drug delivery.
• These materials can better withstand mechanical stresses in the stomach compared to conventional SPHs.