By John Comyn
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10, where x is about 2 and n about 20. The addition of a small quantity of trichloropropane leads to branch points, which in turn lead to crosslinking on curing. 10 Polysulfide sealants are formulated with mineral fillers to reduce cost and to modify flow properties, phthalate plasticizers and silane coupling agents. They are two-part systems and curing agents include manganese dioxide and chromates. Curing involves oxidative coupling of -SH end groups to form -S-S-, and has a complex free-radical mechanism.
Chromic acid anodizing can also be used with titanium alloys, but anodizing in sodium hydroxide solution is preferred because of the toxicity of chromium compounds. WOOD A freshly cut wood surface is ideal for adhesive bonding because of its porosity, but care should be taken to remove sawdust. Old timber is best resawn. 2 Honeycomb structures acid. oil aluminium afier anodizing iri phosphoric 24 Chapter 2 The surface of glass can be readily bonded when clean and dry. Probably the largest commercial bonding of glass is in double glazing units, where the surface is cleaned with water and the sealant is most often a polysulfide.
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. Because they are brittle, other polymers are added to phenolics to toughen them. These include poly(viny1 formal), poly(viny1 butyral), epoxides and nitrile rubber.
Adhesion Science by John Comyn