Summary
The synthesis of polymers by means of the Friedel—Crafts condensation reaction dates from 1881. More recently, a wide variety of aromatic compounds have been polymerised by means of catalysts such as aluminium chloride and stannic chloride. The condensation reactions involve the elimination of small molecules, usually hydrogen halide or methanol.
The polymerisation reactions can be made to produce crosslinked networks. The curing process, however, is liable to produce voids which impair the mechanical properties of the resultant products. The more promising materials are derived from phenol and αα’-dimethoxy-para-xylene; in this case, the phenolic component facilitates crosslinking by either hexa- methylene tetramine, or a diepoxide.
These resins have now been developed commercially. They are used in mouldings and laminates because of their good chemical resistance, electrical properties and high-temperature performance. They also have some potential as coatings. Blending with conventional phenol-formaldehyde resins improves the properties of the latter.
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Harris, G.I. (1980). Phenol Aralkyl and Related Polymers. In: Pritchard, G. (eds) Developments in Reinforced Plastics—1. The Development Series, vol 30. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8724-1_4
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