How do sticky things stick? e.g why does sellotape stick to things? Is it molecular or some other reason?
Answers:
Sellotape is coated on one side with an acrylic or rubber/resin adhesive. Which leads to the question how does an adhesive stick?
By all accounts there is some disagreement over this but best guess appears to be a combination of molecular attraction between negative and positive particles and the glue flowing into the imperfections in the two surfaces locking them together physically.
Some other reason.
sellotape has a slow drying glue attached to one side of it
Static
Some everyday foods work well as adhesives because of the structure of the molecules that make up the substance.
Proteins, such as milk and egg yolk, are good for making glue.
This is because proteins are often long, branching, stringy chains of molecules. These molecules are mixed into liquids to make glue.
When the protein in a liquid is put onto a surface, it moves into the pores and spaces of the material. When the liquid dries, the proteins harden and keep everything that they've touched connected.
Really smooth surfaces like metal and glass don't have any pores and therefore glue doesn't stick to them very well.
Some adhesives, like tape, never completely harden. Instead of being mixed with liquid, they are mixed with a rubbery material that stays rubbery and doesn't harden like glue.
Because they're sticky.
I think its cause they have glue on them. Hope that helped
Static charge.
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