Self-healing and self-cleaning clear coating

Ajmir Khan; Kun Huang; Mohammed G Sarwar; Krystal Cheng; Zhao Li; Mohammad O Tuhin; Muhammad Rabnawaz

doi:10.1016/j.jcis.2020.05.073

Self-healing and self-cleaning clear coating

J Colloid Interface Sci. 2020 Oct 1:577:311-318. doi: 10.1016/j.jcis.2020.05.073. Epub 2020 May 25.

Authors

Ajmir Khan¹, Kun Huang¹, Mohammed G Sarwar¹, Krystal Cheng¹, Zhao Li¹, Mohammad O Tuhin¹, Muhammad Rabnawaz²

Affiliations

¹ School of Packaging, Michigan State University, 448 Wilson Road, East Lansing, MI 48824-1223, USA.
² School of Packaging, Michigan State University, 448 Wilson Road, East Lansing, MI 48824-1223, USA. Electronic address: rabnawaz@msu.edu.

PMID: 32497916
DOI: 10.1016/j.jcis.2020.05.073

Abstract

Coatings exhibiting both self-cleaning and self-healing properties are envisioned for a wide range of applications. Herein we report a simple fabrication approach toward poly(urea-urethane) (PU) coatings having self-healing and self-cleaning properties. The self-cleaning component is a poly(dimethylsiloxane) (PDMS), which is affordable in cost and also has a lower environmental footprint relative to its fluorinated counterpart. The self-healing properties are imparted by dynamic urea bonds of the matrix. The obtained surfaces are evaluated for their anti-smudge properties such as water-, oil- and ink-repellency, as well as optical properties. The self-healing properties of these coatings are evaluated by making scores with a doctor blade and monitoring the healing under different conditions using optical microscopy. The resultant coatings are also investigated for their good mechanical properties. The surface chemical compositions are determined x-ray photoelectron spectroscopy, while atomic force microscopy is used for microstructural analysis of these coatings.

Keywords: Clear-coating; PDMS; Polyurethane; Self-cleaning; Self-healing.