5.1.5 Basic chemistryAll adhesives either contain polymers, orpolymers are formed within the adhesives give adhesives cohesivebond. Polymersstrength. Linear and branched polymers can be usedas hot melt, and solvent-based adhesives.respectively All structural adhesivescrosslinkedarebecause this eliminates creep
5.1.5 Basic chemistry ◼ All adhesives either contain polymers, or polymers are formed within the adhesive bond. Polymers give adhesives cohesive strength. ◼ Linear and branched polymers can be used as hot melt, and solvent-based adhesives, respectively. ◼ All structural adhesives are crosslinked because this eliminates creep
Many adhesives contain additives that are notbolymersStabilizers against degradation by oxygen and UV Plasticizers which increase flexibility and lowerthe glass transition temperaturePowdered mineral fillers, which may reduceshrinkage on hardening, lower cost, modify flowproperties before hardening and modify finalmechanical properties.Other possible additives are tackifiers and silanecoupling agents
◼ Many adhesives contain additives that are not polymers ◼ Stabilizers against degradation by oxygen and UV, ◼ Plasticizers which increase flexibility and lower the glass transition temperature ◼ Powdered mineral fillers, which may reduce shrinkage on hardening, lower cost, modify flow properties before hardening and modify final mechanical properties. ◼ Other possible additives are tackifiers and silane coupling agents