# PDMS–Epoxy Micro-Nano Composite Structures Constructed via Open-Loop Addition Reactions and Their Optical and Antifouling Performance Modulation

## TL;DR

This paper introduces a new method to create durable, self-cleaning coatings with high optical performance using epoxy and PDMS composites.

## Contribution

A synergistic modification strategy combining micro/nano-structure design and surface energy modulation for enhanced coating properties.

## Key findings

- The coating achieved a water contact angle of 123.5°, indicating strong self-cleaning properties.
- Visible light reflectance reached 95% and emissivity increased to 90%.
- The coating showed stability against corrosion, extreme temperatures, and ultrasonic agitation.

## Abstract

Epoxy resin (E-51) exhibits excellent adhesion and is widely used in the preparation of functional composite coatings. However, its smooth surface lacking micro/nano composite structures limits its self-cleaning capability and optical properties. Direct incorporation of organic silicone or inorganic fillers often faces severe phase separation and filler agglomeration issues, resulting in defects in coating durability and weather resistance. To address these challenges, this study developed a synergistic modification strategy integrating surface energy modulation with the architectural design of micro/nano-structures. Amino-terminated PDMS undergoes ring-opening addition reactions with epoxy groups in the epoxy resin, while functionalized barium sulfate nanoparticles modified with dual silane coupling agents are incorporated to enhance optical properties. This synergistic approach not only resolved interfacial compatibility but also endowed the PDMS@EP-BaSO4 coating with outstanding comprehensive properties; the water contact angle increased to 123.5°, demonstrating an easy-to-clean benefit. Visible light reflectance reached 95%, and emissivity rose to 90%. Furthermore, when applied to metal surfaces, the coating exhibited excellent stability against acid–alkali–salt corrosion, extreme temperatures, and ultrasonic agitation. This work provided a novel approach for developing protective coatings that integrated high reflectance, high emissivity, and long-term anti-soiling properties.