Understand why we do what we do :P

Why doesn’t glue stick to the inside of the bottle?

A tube of Super glue

Image via Wikipedia

Well we all know that we can use glue to stick things to each other. What if my crisis is that the glue bottle has cracked or broken?

Is this bottle made of some weird material that is resistant to the glue’s awesome “sticky powers”!!!

Well to put it simply, the answer to my crisis is “Yes, I can use glue to fix a cracked glue bottle”. But then how does the glue not stick to the inside of a bottle? What is the secret?

Well let us start by stating the principle on which glue works. It works on the idea of Mechanical Adhesion. Simply put:-

Adhesive materials fill the voids or pores of the surfaces and hold surfaces together by interlocking. Sewing forms a large-scale mechanical bond,velcro forms one on a medium scale, and some textile adhesives form one at a small-scale.

Wikipedia

Ok, so this is the concept; but how does it work?

Well glue is made up of 2 primary things, a substance that “sticks” and a solvent that keeps it liquid. When you use glue, you basically apply it on a material. From then, the solvent evaporates, resulting in a very sticky glue. Inside a bottle, there is limited space, and hence limited solvent can evaporate into it, resulting in glue not sticking to the bottle.

Now if you kept the bottle open for a long time, the solvent would evaporate out and the result would be a huge chunk of glue stuck to the inner side of the bottle.

Well now you know, but before we finish here. What about super glue? 😛

Well here is an explanation taken from http://www.ehow.com, that tells exactly what happens:-

Superglue, such as Krazy Glue, works slightly differently. It’s made of a chemical called ethyl cyanoacrylate. This reacts with water vapor in the air to form an adhesive bond, via chemical adhesion.

No matter how dry it is where you live, there’s some water vapor in the air. That’s why superglue tends to dry out more quickly in its container than white glue does—it’s hard to reclose the container tightly enough to prevent water vapor from seeping in. But in a never-opened container (or a well-closed one), even superglue will remain in its liquid form and won’t stick to the inside of the container, as long as it’s protected from its nemesis: water.

Finally before we end this answer how about a glue joke 🙂

Q: What did one tube of glue say to the other tube of glue?
A: We have to stick together.

source: http://www.jokebuddha.com/Glue/recent#ixzz1EeqfTTJN

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