Cationic Nanogels Based On Diethylaminoethyl Methacrylate

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Crosslinked nanogels are essential for various applications.
• Controlling nanogel properties like surface chemistry and swelling is crucial.
• Existing methods for nanogel synthesis have limitations.

Purpose of the Study:

• To investigate the impact of polymer composition and polymerization parameters on nanogel properties.
• To develop a novel inverse-emulsion polymerization method for nanogel synthesis.
• To compare the properties of nanogels synthesized via the new method with microparticles from solution polymerization.

Main Methods:

• Utilized inverse-emulsion polymerization to synthesize crosslinked 2-(diethylaminoethyl methacrylate) (DEAEM) and polyethylene glycol monoethyl ether monomethacrylate (PEGMMA) nanogels.
• Incorporated polyethylene glycol (PEG) surface tethers of varying lengths (400 Da to 2000 Da).
• Characterized nanogel properties including size, surface charge (ζ-potential), and swelling behavior under different pH conditions.

Main Results:

• Developed a novel polymerization method yielding nanogels sized 100-400 nm.
• PEG surface tethers significantly reduced ζ-potential in both acidic (70 mV to 30 mV) and basic ( -60 mV to 2 mV) conditions.
• Demonstrated significant pH-dependent swelling, with nanogel size increasing from 100 nm in basic to 800 nm in acidic media due to DEAEM protonation.

Conclusions:

• The novel inverse-emulsion polymerization method offers precise control over nanogel characteristics.
• Surface modification with PEG tethers effectively modulates surface charge and swelling responses.
• These tunable nanogels hold promise for applications requiring controlled surface properties and stimuli-responsive behavior.