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| From: Robz |
04/09/2000
23:03:00
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| Subject: What Makes Glue
Stick |
post id:
128552
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Can someone tell me what makes
glue stick?
It can't just be surface tension - eg a wet piece of
paper will stick to a window as long as their is water their, but when it
dries out the paper falls off. However, replace the water with glue and
when the glue dries the paper stays.
Why do different glues act
better on different types of surfaces - plastic, metal,
fibreglass
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| From: Cam ® |
04/09/2000
23:49:00
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| Subject: re: What Makes Glue
Stick |
post id:
128605
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Superglue works by polmerisation.
I don't know if this is the way epoxy resins work.
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| From: Pete ® |
05/09/2000
9:27:00
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| Subject: re: What Makes Glue
Stick |
post id:
128741
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My understanding is that it does
indeed work by surface tension.
Eg if you have put two very very very
smooth surfaces together, they stick together as if the were
welded.
Sticking paper to the window with water works the same way, by
putting a thin medium in between the surface to fill in all the
irregularities - the problem with water is that it evaporates, and the
irregularites return.
Glues, in general, still work the same way, but
when they dry, they don't evaporate - they remain in the same shape as
they were originally, so the irregularities remain filled, and the surface
tension still holds.
I *think* the main difference between types of
glues is the 'drying' (setting) mechanism, and the properties of the
dry(set) glue, vis flexibility, porousness, tensile strength,
etc.
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| From: Drues |
05/09/2000
10:25:00
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| Subject: re: What Makes Glue
Stick |
post id:
128754
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Actually, a study into this was
done in '98 at Cambridge I think.
They found that glue works by forming
a network of tiny bubbles that provide massive strength and
stability.
As for the physics part of hows and whys, I have no
idea.
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| From: Alan™ ® |
05/09/2000
10:40:00
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| Subject: re: What Makes Glue
Stick |
post id:
128759
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Hopefully with the Jo Gibb
problem reduced / gone away, I'll come out of my self imposed exile
:-)
This really depends upon what type of glue you are talking
about.
Epoxy glues work by cross linking between the polymer
(glue) constituents. With the joining properties achieved by absorption
into the surface of the materials or atleast finding crevices where it can
take hold.
Other glues, require evaporation for the glue to form
any changes, you'll find that branching occcursas the glue drys. Joining
properties are more based upon finding crevices or absorption, but the
degree of this is significantly less epoxy glues.
Sticking tape /
gum based glues are more surface based, no absorption and work by
electrostatic forces (so understand).
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