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. 2024 Feb 13;29(4):829.
doi: 10.3390/molecules29040829.

A One-Step Approach for a Durable and Highly Hydrophobic Coating for Flax Fabrics for Self-Cleaning Application

Antoine Ishak  1 , Rodolphe Sonnier  1 , Belkacem Otazaghine  1 , Claire Longuet  1
Affiliations

A One-Step Approach for a Durable and Highly Hydrophobic Coating for Flax Fabrics for Self-Cleaning Application

Antoine Ishak et al. Molecules. .

Abstract

Highly hydrophobic flax fabrics with durable properties were prepared using the "dip-coating" method for self-cleaning application. Flax fabrics were coated with a polysiloxane coating via a hydrosilylation reaction with a Karstedt catalyst at room temperature. The coated fabrics displayed highly and durable hydrophobic properties (contact angle and sliding angle of about 145° and 23°, respectively) with good self-cleaning ability for certain pollutants and excellent durability. Moreover, the influence of the coating process on the mechanical properties of fabrics was investigated. A decrease in E modulus and an increase in tensile stress at maximum force and elongation at maximum force has been observed. Furthermore, this influence of the coating process can be easily controlled by adjusting the proportion of curing agent in the treatment solution.

Keywords: PDMS; coating; flax fabric; hydrophobisation; hydrosilylation; self-cleaning.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
CR and calculated and measured Si content in the coated fabric (samples 01–05) as a function of the concentration of the coating solution.
Figure 2
Figure 2
TGA curves of pristine and coated fabrics with 4 and 12 wt% of silicone.
Figure 3
Figure 3
FTIR spectra for (a) PDMS-co-PHMS, D4V and the coating-based crosslinked polysiloxane. (b) Pristine and coated flax fabrics. (c) SEM/EDS images for pristine and coated fabrics of 4 and 12 wt% of CR.
Figure 4
Figure 4
(a) Contact and sliding angles for coated samples with different silicone contents. (b) Images of drops of milk, coffee and tomato sauce deposited onto the surface of the coated fabric. (c) Self-cleaning performance of coated fabric for mud stains.
Figure 5
Figure 5
(a) Elongation and E modulus, (b) F(max) and E modulus for pristine and coated threads with different Si-H/Si-vinyl ratios.
Figure 6
Figure 6
Schematic representation of the formation of the cross-linked polysiloxane coating.
Figure 7
Figure 7
Scheme of the preparation of the hydrophobic flax fabrics via dip-coating method.
See this image and copyright information in PMC

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