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10. 10) 2,4,6-Tris(dimethylaminomethyl)phenol is an oligomer containing phenols bridged by ether and methylene groups, and with methylol groups substituted on the benzene rings. 4. 4 If used as adhesives they would be heated to 130-160°C in the joint, where further condensation of methylol groups takes place to give a crosslinked polymer (see Chapter 1). To avoid the formation of voids filled with steam, joints with phenolic adhesives have to be cured under pressure, usually between heated steel platens of a hydraulic press.
2Nm-' on adding 20% by weight of CTBN. SILICONES One-part silicone adhesives are often termed room temperature vulcanizing (RTV), and consist of poly(dimethy1 si1oxane)s(PDMS) with molar masses in the range 300-1600, with acetate, ketoxime or ether end groups. 8. They are best known as sealants for use in the bathroom. When the acetate terminated PDMS cures there is a smell of acetic acid. 8. There is a sharp advancing front of cured sealant, and the cured material acts as a barrier for water permeation.
Primers based on chlorinated rubber seem to be chemisorbed to some oxide surfaces. Examples of some commercial primers for structural adhesives are as follows; it may be noted that they are made for specific adhesives, have recommended coating thicknesses, and generally require curing at elevated temperatures. Cyanamid BR 127. This is particularly recommended for use with FM373 toughened epoxy film adhesive. 0 pm, After drying in air for 30 min the primed surface is cured for 30min at 120 6 "C; it then has an indefinite shelf-life.