PDMS-Epoxy Micro-Nano Composite Structures Constructed via Open-Loop Addition Reactions and Their Optical and...

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Epoxy resin (E-51) coatings have excellent adhesion but lack micro/nano structures for self-cleaning and optimal optical properties.
• Directly adding fillers like organic silicone or inorganic particles causes phase separation and agglomeration, compromising coating durability.
• Existing methods struggle to improve both surface properties and structural integrity simultaneously.

Purpose of the Study:

• To develop a synergistic modification strategy for epoxy coatings.
• To improve self-cleaning capability, optical properties (reflectance and emissivity), and durability.
• To overcome challenges of phase separation and filler agglomeration in composite coatings.

Main Methods:

• Developed a synergistic approach combining surface energy modulation and micro/nano-architectural design.
• Utilized amino-terminated polydimethylsiloxane (PDMS) for ring-opening addition reactions with epoxy groups.
• Incorporated dual silane coupling agent-functionalized barium sulfate (BaSO₄) nanoparticles.

Main Results:

• Achieved a water contact angle of 123.5°, indicating easy-to-clean properties.
• Enhanced visible light reflectance to 95% and emissivity to 90%.
• Demonstrated excellent stability against corrosion, extreme temperatures, and ultrasonic agitation on metal surfaces.

Conclusions:

• The developed PDMS@EP-BaSO₄ coating exhibits superior comprehensive properties, including high reflectance, high emissivity, and anti-soiling capabilities.
• The synergistic modification strategy effectively resolved interfacial compatibility issues.
• This work presents a novel pathway for creating advanced protective coatings with integrated functionalities.