Self-healing anti-icing coatings prepared from PDMS polyurea

Abstract

With the help of double hydrogen bonds between urea groups, a self-healing anti-icing coating was prepared from polydimethylsiloxane (PDMS)-based polyurea (PDMSPU) that was synthesized from bis(3-aminopropyl)-terminated PDMS and 2,4-toluene diisocyanate. Furthermore, by incorporating a lubricant of inert silicone oil and the cross-linking agent of 1,3,5-tris-(4-aminophenoxy)benzene (TAPOB), the anti-icing coatings exhibited elastic, slippery and durable properties. The wettability, ice shear strength, abrasion-resistance, mechanical and self-healing properties of the prepared anti-icing coatings were systematically investigated. Results showed that the ice shear strength of the PDMSPU anti-icing coating with 150 wt% silicone oil was 7.9±2.9 kPa, significantly lower than that of pristine PDMSPU (74.7±7.2 kPa). The additional introduction of 2 wt% TAPOB could effectively counteract the adverse effect of the lubricant so that the tensile strength (∼1 MPa) of the coating could be comparable to pristine PDMSPU (855±96 kPa). The PDMSPU coating containing 150 wt% silicone oil and 2 wt% TAPOB could maintain the ice shear strength below 50 kPa against 10 icing/deicing cycles and at 12.0±3.3 kPa after 5000 abrasion cycles, and exhibit self-healing properties after treating at 60°C for 10 or 15 h. The slippery self-healing PDMSPU anti-icing coatings could be suitable for anti-icing surfaces in low temperature environments.

Robust and Durable Superhydrophobic Coatings with Antipollution Flashover Performance via Silane-Modified Polyurea

“…After the addition of isocyanate, compared with Si M/N -KH550, in addition to the above two peaks, the peaks located at around 3183, 1687, 1540, and 765 cm –1 can be observed. The four peaks can be attributed to N–H and CO stretching vibrations and N–H shear and bending vibrations, respectively, demonstrating the generation of ureido groups. , The content and distribution of chemical elements were detected by XPS of the Si M/N -K-PUa coating, as shown in Figure c–f. There are five peaks at 102, 153, 286, 399, 532, and 686 eV, corresponding to Si 2p, Si 2s, C 1s, N 1s, O 1s, and F 1s, respectively (Figure.…”

An Extreme‐Environment‐Resistant Self‐Healing Anti‐Icing Coating

“…According to the material types of anti-icing coatings, the primary properties of recently-reported self-healing anti-icing coatings are summarized in Figure 6. [19,20,[46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] Most coatings possess excellent anti-icing performance but without self-healing capability. Although there are a few reports of self-healing anti-icing coatings, they commonly require an external stimulus (e.g., thermal energy) to achieve self-healing, and none of them is able to heal under various extreme environments.…”

Enhanced Surface Icephobicity on an Elastic Substrate

“…Bioinspired by Nepenthes pitcher plants, Wong et al designed slippery liquid-infused porous surfaces (SLIPS) (Figure a), and these well-known surfaces show low ice adhesion strength (Figure b). , SLIPS, however, are nondurable for closure and low-porosity textured substrates, which are easily depleted during icing/de-icing cycles and thus thereby limit their application in the anti-icing field. ,, Learning from SLIPS, many researchers have introduced the slippery property onto various substrates (e.g., elastomers, ,,,,,,,− organogels, ,,,, and Mg alloys) for anti-icing applications. For hard solid substrates (i.e., Mg alloys), Liu et al developed Mg-alloy-based slippery liquid-infused porous network surfaces (SLIPNS) with an ice adhesion strength of 48.1 kPa, exhibiting improved anti/de-icing and self-healing properties (Figure c) .…”