Re: Physical Chemistry of Hide Glue
By Frank Himpsl
There's not much I can offer in this area, never having been exposed to the chemistry of adhesives. It's a complex area, usually considered as materials science, something you'd pick up only if you are working in the area of adhesives.
I know that some glues work because of reactive surface hydroxyl groups (which may or may not be there, depending on what the surface is) which upon drying form an oxide bond linkage with the release of a molecule of water.
In other words, two surfaces with -OH (hydroxyl) groups come together, and go to -O- (oxygen) upon drying, yielding an oxide bonding two surfaces together, and H2O (water). It's a form of condensation reaction, and at least one of the adhesion mechanisms. I can't say that this is how hide glue works; I just don't know.
Surface-----OH + HO------Surface (e.g. glue molecules and wood)
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Surface-----O-------Surface + H2O
Certainly epoxy cements work more on surface tension principles, being able to "wet" a surface sufficiently and then form a hard bond between them upon drying.
Sorry I can't help more, Robbie.
Frank Himpsl |
(Message sent Sat 4 Jan 1997, 21:51:44 GMT, from time zone GMT-0500.) |
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