Original Entry: Ian Burgess, Fall 2009
An adhesive is a material that is used to bind two surfaces together. Most adhesives are initially in a flowable state (i.e. can be spread) and then turn into a solid state after time/drying/curing etc, forming strong bonds internally and with each surface. These bonds can be covalent or intermolecular bonds (dipole-dipole, hydrogen bonds, etc.). Some example types of adhesives are: 1) thermoplastics, which are generally applied and spread above their melting point after-which they set into strong solids as they cool down; 2) Photocuring adhesives, which are flowable polymers which cross-link and solidify upon exposure to light (usually UV). They can be single component or be a mixture of multiple compounds, often a base resin and a photo-initiator or cross-linking agent
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