Nano-based adhesives, enhanced with nanoparticles, offer superior strength and durability for aerospace and electronics industries.
By Ibtisam AbbasiFeb 24 2022Reviewed by Lexie Corner Nanostructured adhesives are a novel technology that incorporates nanoscale materials like nanoparticles or nano-fillers to enhance adhesion and other key properties.Studies show that nanoparticles can act as interfacial links, bonding hydrogels, or biological tissues. These adhesives have various physicochemical properties and are used in the aerospace, automotive manufacturing, and electronics industries.
Incorporating nanofillers is effective in enhancing the performance of these base polymers. Nanofillers improve the mechanical properties of polymeric adhesives, such as crack resistance, wear resistance, and corrosion resistance.4 Various nanofillers, including nanoclays, carbon nanotubes, metal or metal oxide particles, ceramic fillers, and cellulose nanomaterials , have been investigated for their integration into polymeric adhesive nanocomposites.
These nanomaterial-enriched adhesives exhibit significantly improved bonding strength, toughness, and durability. Their rapid curing ability is invaluable in industries requiring efficient production processes. Additionally, nano-structuring enhances resistance to harsh chemicals and high temperatures, making these adhesives suitable for demanding environments and optimizing them for specific industrial applications.
Ultrasonic systems can also be used for dispersion, but long dispersion times and high power can shorten the nanofillers, altering their aspect ratio and affecting dispersibility. A recent study demonstrated that grafting isophorone diisocyanate , known for its high reactivity and unique structure, onto GO improved dispersion by weakening interlayer interactions. Additionally, incorporating amino-terminated butadiene acrylonitrile , known for its excellent toughening effects, into GO created high-performance fillers.
Silver powders, known for their stable physical and chemical properties, are commonly used as conductive fillers in ECAs. A recent study used a tetra-functional polyurethane acrylate oligomer as the main component of silver-filled one-component ECAs to enhance performance.9 Experiments verified that the oligomer nanofiller significantly boosted adhesion properties.
The Future of Nano-Based Adhesives With recent advancements in manufacturing, adhesives are continuously improving, and the incorporation of nanoparticles is imparting valuable properties. The current focus is on using environmentally friendly methods to enhance modern adhesives. Kenig, S., et al. . Nanocomposite polymer adhesives: a critical review. Rev. Adhes. Adhes. doi.org/10.7569/RAA.2019.097306
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