How do dip-coating and crosslinking affect the properties of materials?
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Dip-coating and crosslinking play crucial roles in determining the properties of materials. Dip-coating processes, such as roll and doctor blade techniques, are effective in creating nanocomposite coatings with enhanced barrier properties and morphology, especially when tailored to promote hydrogen bonding within the coating. Additionally, dip-coating methods can be utilized for thin-film formation with inorganic fillers, nanoparticles, or clusters, enabling near-net-shaped production of engineering components. On the other hand, crosslinking is often employed to stabilize films, like water-resistant PEDOT:PSS films, without the need for additional crosslinkers that may induce undesired reactions. Crosslinking with compounds like glyoxal and glutaraldehyde can further improve barrier properties and enhance the efficiency of coated films. These techniques collectively contribute to enhancing material properties, such as conductivity, semiconductivity, and corrosion resistance .
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| Papers (5) | Insight |
|---|---|
| Dip-coating with in situ hydrophilic silica enhances corrosion resistance and metal bonding strength. Crosslinking in the epoxy-based Teflon coating improves impedance modulus and corrosion inhibition efficiency significantly. | |
| Dip-coating and crosslinking in the technology enhance the surface hardness, reduce reflectivity, improve anti-blue ray effect, and increase blue ray filtering efficiency of resin lens materials. | |
6 Citations | Dip coating with inorganic particles (>5 μm) and varying binder fractions influences solid transfer, affecting material properties like coating thickness and surface coverage in near-net-shaped production. |
04 Jul 2023 | Dip-coating without crosslinkers stabilizes water-resistant PEDOT:PSS films by sequential soaking in ethanol and water, enabling applications on non-planar surfaces like 3D-printed objects and neuromorphic transistors. |
16 Sep 2019 | Dip and roll-coating techniques impact crosslinking efficiency and oxygen barrier properties in nanocomposite coatings. Crosslinking with glyoxal and glutaraldehyde enhances barrier properties by favoring hydrogen bonding. |
Related Questions
Which factors inhibit crosslinking reaction of polymer?5 answersFactors that inhibit the crosslinking reaction of polymers include radical scavengers, such as those that are incorporated into the polymers, which hinder the formation of crosslinks. Additionally, the presence of certain solvents can either sensitize or retard the crosslinking process by interacting with the polymer radicals, forming additional macroradicals, or deactivating macroradicals. Moreover, the use of specific coagents, like 2,4-diphenyl-4-methyl-1-pentene, can increase the scorch time and crosslinking efficiency, thereby inhibiting premature crosslinking reactions. Understanding these inhibitory factors is crucial in controlling and optimizing the crosslinking process of polymers for desired properties and applications.
What is Diamond dip-coating?5 answersDiamond dip-coating is a technique used to fabricate composite films by dispersing diamond particles in a polymer matrix and coating them onto a substrate. This method involves solubilizing the polymer, such as polyethyl methacrylate (PEMA), in a solvent using solubilizing agents like 18β-glycyrrhetinic acid (GRA) and rhamnolipids (RLP). The solubilizing agents not only dissolve the polymer but also disperse the diamond particles, allowing for the formation of composite PEMA-diamond films. The resulting films can be obtained as monolayers or multilayers with controlled film mass and composition. The use of GRA in the dip-coating process improves the protective properties of the films, providing corrosion protection for stainless steel. This method offers a versatile strategy for the fabrication of polymer coatings containing various functional materials, opening up possibilities for biomedical applications and other fields.
How are polymers crosslinked?4 answersPolymers are crosslinked through a process called crosslinking, which involves the formation of covalent or ionic bonds between polymer chains. Crosslinking can occur during polymer synthesis or through additional reactions after the polymer is formed. Crosslinking agents are used to facilitate the crosslinking process, and only a small amount is needed due to the length of the macromolecules. As crosslinks are formed, the polymer undergoes an increase in branching, polymerization, and growth, eventually leading to the formation of a network structure. Crosslinked polymers have reduced solubility and fusibility, increased thermal stability, and resistance to chemicals. Common methods of crosslinking include chemical crosslinking using agents such as glutraldehyde and genipin, as well as physical crosslinking through high pressure or irradiation. The specific crosslinking process and conditions can vary depending on the desired properties of the polymer.
What is the physics behind dip coating method?5 answersThe physics behind the dip coating method involves the formation of a thin liquid film on a solid surface. The thickness of the coated film is determined by various factors such as the capillary number, the properties of the liquids used, and the relative thickness of the upper fluid layer in the dipping bath. When the dipping bath contains two immiscible liquids, two thin films are entrained on the substrate, and the thicknesses of these films depend on the aforementioned factors. The liquid/liquid and liquid/gas interfaces evolve independently from each other, except for a small region where their separation falls quickly to its asymptotic value and the shear stresses at the interfaces peak. The final coated thicknesses are determined by the values of these maximum shear stresses.
How does the speed of immersion influence the thickness of film in dip coating?5 answersThe speed of immersion in dip coating has a significant influence on the thickness of the film. At low dipping angles, such as 1°, a wider range of thickness can be achieved, and the perturbations induced by evaporation are eliminated. For monodisperse suspensions, the thickness of the coating film can be captured by an effective capillary number based on the viscosity of the suspension, as long as the film is thicker than the particle diameter. The liquid film thickness increases initially and then becomes constant over time, and this constant film thickness is in agreement with existing correlations. The increases in withdrawal speed and fluid viscosity are beneficial to film thickening, and the influence of rest time on liquid film thickness can be neglected after a certain duration. The thickness of sol-gel films increases with the dipping speed.
How does enamel coating affect the properties of the material being coated?3 answersEnamel coatings have a significant impact on the properties of the material being coated. They provide protection against environmental influences, such as acidity, and ensure the durability of the material. Enamel coatings on steel surfaces offer hard and chemically resistant surfaces, resulting in good corrosion protection properties. Composite enamel coatings with the addition of corundum particles improve abrasion resistance without compromising protection properties. The addition of graphene flakes to enamel coatings enhances abrasion resistance, although it may affect aesthetic properties. The chemical nature of the primer layer used in enamel coating systems affects adhesive, physical, and mechanical properties of the coating system. Overall, enamel coatings enhance the resistance of materials to wear, corrosion, and chemical influences, making them suitable for various applications.