Work

Fabrication of a Hydrophobic Coating Using Acacia mearnsii De Wild Tannin Melamine Formaldehyde Microcapsules

Year: 2025

Type: article

Abstract: The aim of this study is to develop and investigate the effect of applying microcapsules containing a melamine formaldehyde resin shell and a tannin extract as a core to form a hydrophobic coating. The microcapsules were obtained by in situ polymerization. Morphological analysis was performed by focused ion beam/scanning electron microscopy. The chemical composition of the tannin extract, the melamine formaldehyde resin, and the polymeric microcapsules with the core of the tannin extract was determined by Fourier transform infrared spectroscopy. The thermal stability of tannin, melamine formaldehyde resin, and tannin microcapsules was investigated by thermogravimetric analysis. In addition, the durability of the coating over time was tested in an environmental test chamber. The polymeric microcapsules containing tannin extract are quasi-spherical, rough, and dense, with a diameter ranging from 1 to 5 μm and a shell thickness of 50 nm. The coating exhibited a hierarchical structure with improved hydrophobic properties, resulting in a contact angle of up to 148°.

Source: Coatings

DOI: 10.3390/coatings15040419

Authors: Ana Paula Steigleder, Liane Roldo

Institutions: Universidade Feevale, University of Split

Language: English

Topic: Surface Modification and Superhydrophobicity

Subfield: Surfaces, Coatings and Films

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funder: Conselho Nacional de Desenvolvimento Científico e Tecnológico