why super glue does not stick inside their own bottle??
Answers
Adhesives are designed to work when they leave the tube—and not before. Different adhesives achieve this in different ways. Some are dissolved in chemicals called solvents that keep them stable and non-sticky in the tube.
When you squeeze them out, the solvents quickly evaporate in the air or get absorbed by the surfaces you're sticking to, freeing the adhesives themselves to do their job.
Plastic modeling glue works like this. It contains molecules of polystyrene in an acetone solvent. When you squeeze the tube, the glue spurts out and you can usually smell the very strong acetone as it evaporates.
Once it's gone, the polystyrene molecules lock together to make strong chemical bonds. Glue doesn't smell when it's dry because all the solvent has vanished into the air.
Some glues (such as synthetic, epoxy resins) have to be mixed together before they work. They come in two different tubes, one containing the synthetic resin and the other containing a chemical that makes the resin harden. The two chemicals are useless by themselves but, mixed together, form a tough, permanent adhesive.
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