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As adhesives, epoxies bond in three ways: a) Mechanically, because the bonding surfaces are roughened; b) by proximity, because the cured resins are physically so close to the bonding surfaces that they are hard to separate; c) ionically, because the epoxy resins form ionic bonds at an atomic level with the bonding surfaces.
Cure is characterised by expansion rather than shrinkage and uses include structural prepregs, liquid molding and film adhesives for composite construction, bonding and repair. The high aromatic content of the high molecular weight polymers provides enhanced mechanical and flammability performance compared to epoxy and phenolic resins.
Some of the more common thermosets include epoxy, polyurethanes, phenolic and amino resins, bismaleimides (BMI, polyimides), polyamides. [3] [4] [5] Of these, epoxies are the most commonly used in the industry. Epoxy resins have been in use in U.S. industry for over 40 years. Epoxy compounds are also referred to as glycidyl compounds.
Benzoxazines, used alone or hybridised with epoxy and phenolic resins, for structural prepregs, liquid molding and film adhesives for composite construction, bonding and repair. Mold or mold runners (the black plastic part in integrated circuits or semiconductors).
Epoxy encapsulation materials are a type of highly filled particulate polymer composite, comprising various components to meet the requirements for reliability, physical properties, and moldability. These components include silica , epoxy resin , hardeners, flame retardants , catalysts , and stress-relaxation additives .
Solvent bonding – Adhesives and solvents are rarely used as solvent bonding because polyethylene is nonpolar and has a high resistance to solvents. Pressure-sensitive adhesives (PSA) are feasible if the surface chemistry or charge is modified with plasma activation , flame treatment , or corona treatment .
The best epoxy kits for a 2½-car garage are about $500 to $800. That may seem pricey, but carefully installed and regularly cleaned, they can last and gleam for decades. You Might Also Like
Epoxy resins are typically cured by the use of additives, often called hardeners. Polyamines are often used. The amine groups ring-open the epoxide rings. In rubber, the curing is also induced by the addition of a crosslinker. The resulting process is called sulfur vulcanization.