Preparation and Morphology Studies of Core-Shell Type Waterborne Polyacrylate-Polyurethane Microspheres.

Area of Science:

• Polymer Science
• Materials Science
• Nanotechnology

Background:

• Development of advanced polymer microspheres is crucial for high-performance coatings.
• Waterborne systems offer environmental advantages over solvent-based alternatives.
• Core-shell structures enable tailored material properties.

Purpose of the Study:

• To synthesize and characterize core-shell type waterborne polyacrylate-polyurethane microspheres.
• To investigate the effect of cross-linking on microsphere structure and properties.
• To evaluate the storage stability, water resistance, and coating performance of the prepared microspheres.

Main Methods:

• Preparation of polyacrylate-polyurethane core-shell microspheres using specific cross-linking agents (hydroxyethyl acrylate and adipic dihydrazide).
• Photon Correlation Spectroscopy (PCS) for particle size distribution analysis.
• Transmission Electron Microscopy (TEM) for visualizing core-shell morphology and cross-linked networks.

Main Results:

• All microspheres exhibited continuous particle-size distributions with mean sizes below 200 nm.
• TEM confirmed distinct core-shell structures and revealed different cross-linked networks between core and shell.
• The synthesized microspheres demonstrated excellent storage stability, water resistance, and coating properties.

Conclusions:

• Successful synthesis of waterborne polyacrylate-polyurethane core-shell microspheres was achieved.
• Cross-linking agents effectively formed networks, influencing microsphere morphology.
• The resulting microspheres are promising for applications requiring high stability and water resistance in coatings.