By John Comyn
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Additional info for Adhesion Science
Tetramethylolurea has not been isolated. 5 All these compounds undergo condensation polymerization uia methylol groups, to give crosslinked products. The reactions take place at ambient temperatures after the addition of a catalyst. The adhesives are water-based and water is produced on curing; it is removed by migration into the wood, making these adhesives only suitable for porous adherends. ACRYLIC ADHESIVES Structural adhesives containing acrylic monomers are cured by freeradical addition polymerization at ambient temperatures.
Although the best results can be obtained in using silanes as primers, they can also be added to adhesives with some effect. Performance VMS as a comonomer in adhesives improves bond strengths to aluminium. The peel strength of low density polyethylene, which is non-polar, to the metal is 100N m - Copolymerization with butyl acrylate introduces polar groups and increases the peel strength to 700Nm-'. Copolymerization with a monomer which is a salt of a carboxylic acid raises peel strength to 1500 N m - by introducing ions.
Coronae are generated using high voltage, typically 20 kV, and high frequency (10-20 kHz). Both these treatments introduce new chemical groups such as -OH, >CO and -COOH, which are polar, to polyolefin surfaces. Coronadischarge can also be used to treat composites and metals for bonding; it is possible that with metals, oils and greases are volatilized. Newer methods include the use of plasmas and excimer lasers. Chromic acid etch baths can also be used to treat polyolefins, and similar chemical groups are introduced as in flame and corona-discharge, but the method is not used commercially because of the environmental issues and because dry methods are preferred.
Adhesion Science by John Comyn