Efficient Emulsifier-Free Emulsion Copolymerization of Functional Nanoparticles Using Biobased Itaconic Acid

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Emulsifier-free emulsion polymerization is a key technique for synthesizing functional nanoparticles.
• Styrene copolymerization with renewable monomers offers sustainable alternatives to petrochemical-derived materials.
• Itaconic acid (IA) presents unique advantages due to its dual carboxylic acid groups and biomass origin.

Purpose of the Study:

• To investigate the emulsifier-free emulsion polymerization of styrene with itaconic acid (IA) or methacrylic acid (MAA).
• To evaluate the performance of IA-based functional copolymer nanoparticles compared to MAA-based and polystyrene counterparts.
• To explore the potential applications of IA-based nanoparticles in ion separation and environmental remediation.

Main Methods:

• Free radical emulsion polymerization using potassium persulfate (KPS) initiator at 70 °C.
• Copolymerization of styrene (S) with either IA or methacrylic acid (MAA).
• Optimization of IA content (8 mol %) and pH adjustment for nanoparticle synthesis.

Main Results:

• Itaconic acid (IA) enhanced polymerization rate and particle stability due to its dual carboxylic acid groups.
• Optimal P-(S-IA) nanoparticles achieved ~100% monomer conversion in 5 h, with ~200 nm particle size and ~10 wt % coagulation at 30 wt % solid content.
• IA-based nanoparticles demonstrated superior performance over P-(S-MAA) and polystyrene (PS) in terms of stability and low coagulation.

Conclusions:

• Itaconic acid is a promising renewable monomer for creating high-performance functional copolymer nanoparticles.
• The developed IA-based nanoparticles exhibit excellent colloidal stability and low coagulation, suitable for high solid content applications.
• These functional nanoparticles show significant potential as precursors for hybrid materials in ion separation, environmental remediation, and photocatalysis.