Tailoring Hydrogel Sheet Properties through Co-Monomer Selection in AMPS Copolymer Macromers

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Hydrogels are crucial in biomedical applications due to their high water content and tunable properties.
• Developing advanced hydrogels with enhanced swelling and mechanical strength is essential for improved performance in drug delivery and wound management.

Purpose of the Study:

• To synthesize and characterize novel hydrogels based on 2-Acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) copolymers.
• To investigate the effects of incorporating N-hydroxyethyl acrylamide (HEA) and 3-sulfopropyl acrylate potassium salt (SPA) on hydrogel properties.
• To evaluate the potential of these modified hydrogels for drug delivery and wound management applications.

Main Methods:

• Synthesis of AMPS-based copolymers (poly(AMPS-stat-CEA-stat-MAA, PACM)) and their modification with allyl glycidyl ether (AGE) to form macromers (PACM-AGE).
• Further synthesis and AGE modification of copolymers incorporating HEA (PAHCM-AGE) and SPA (PASCM-AGE).
• Characterization using 1H NMR, FT-IR, and GPC; evaluation of hydrogel swelling, water content, and mechanical properties (tensile strength, elongation); preliminary drug delivery studies.

Main Results:

• PASCM-AGE hydrogels demonstrated superior swelling ratios and water retention (~92% water content within 30 min).
• PAHCM-AGE hydrogels exhibited higher tensile strength (5.8 MPa) but lower elongation (19%) compared to PACM-AGE (2.5 MPa, 47%).
• PASCM-AGE hydrogels showed a balance of high tensile strength (3.7 MPa) and greater elongation (92%), indicating versatile property tuning.

Conclusions:

• AMPS-based macromers modified with HEA and SPA offer tunable swelling and mechanical properties for advanced hydrogel applications.
• The enhanced properties of PASCM-AGE hydrogels make them highly suitable for applications requiring significant water absorption and flexibility.
• These modified hydrogels show promise for wound management and drug delivery systems, particularly when combined with photosensitizers for light-activated therapies.