Cyanoacrylates chemical structure

Fig. 2.15 Polymerized 2-octyl cyanoacrylate of eight-repeat units in (a) simple written chemical structure and (b) three-dimensional representation of bonds and atoms...

The term cyanoacrylate comes from the chemical structure of these materials. Figure 1 depicts the general formula for cyanoacrylates. As the figure shows, cyanoacrylate adhesives are made up of carbon, hydrogen, oxygen, and nitrogen. The way these atoms are... 

There are a number of types, based on their chemical structure, but the most important and most widely used is nylon 6,6. The best adhesives for bonding nylon to nylon are solvents. Various commercial adhesives, especially those based on phenol-formaldehyde (phenolics) and epoxy resins, are sometimes used for bonding nylon to nylon, although they are usually considered inferior to the solvent type because they result in a brittle joint. Adhesives recommended include nylon-phenoUc, nitrile-phenolic, nitriles, neoprene, modified epoxy, cyanoacrylate, modified phenolic, resorcinol-formaldehyde, and polyurethane. Bonds in the range of 1.7-6.9 MPa, depending on the thickness of the adherends, have been obtained. ... 

Figure 9.4 Chemical structure of the polymers employed in the experimental tests shown in figures (a) Poly-e-caprolactone (PCL) (b) Poly-hexadecyl cyanoacrylate (PHDCA) and (c) P(methoxypolyethylenglycol cyanocrylate-co-hexadecyl-cyanocrylate) (poly(MePEGCA-co-HDCA, also referred to as PEGylated copolymer.

Cyanoacrylates and Light-Curing Acrylic Adhesives - These types of adhesives have achieved widespread acceptance in high-speed manufacturing because they cure rapidly, offer high bond strength to many substrates and are easy to dispense 9. (See Reference 189 for the structure of these chemicals.)... 

Andrew G. Bachmann has served as President of the American Chemical Engineering Company since founding it in December of 1979. He previously worked at Allied Product Corp. and Loctite Corp. Mr. Bachmann has authored or coauthored several patents in the field of structural adhesives and microencapsulation, and has extensive experience in the chemistry and medical uses of cyanoacrylates as surgical adhesives. He earned his B.S. and M.S. in Chemistry at the University of Richmond and his M.B.A. in Finance and Marketing from the University of Hartford. 

Reactive liquid adhesives can be chemically cross-linked to form durable, three-dimensional molecular structures. These bind chemically and/or mechanically with the fabric surface to generate high joint strength. They are generally one-part elevated-temperarnre-setting or two-part room-temperature-setting polymer systems. However, one-part systems that cure at room temperature when in contact with the substrates are also available (e.g., cyanoacrylates). 

Durability is one of the most important aspects of the performance of a structural adhesive. The durability of an adhesive joint is the sum total of its responses to environmental effects such as heat, moisture, other chemicals, radiation, and mechanical stresses. Cyanoacrylate-based adhesives have a reputation for poor durability, especially when bonding metals... 

Where the hardening of an adhesive or sealant proceeds by chemical reaction, the rate will increase with temperature in accordance with the Arrhenius equation. Such materials include epoxides, structural acryhcs, cyanoacrylates, silicones, and high temperature adhesives. Hence, pot life and cure time will show the following proportionality ... 

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