Adding water to starch-based packing peanuts begins to dissolve them (conventional polystyrene peanuts are not soluble in water). If just a LITLLE water is added to the peanuts, only their edges dissolve and they beome sticky. The sticky peanuts can be then stacked into larger structures. Colored versions of these sorts of packing peanuts are marketed as "Nuudles". This demonstration illustrates concepts of like dissolves like, solvent welding, and recyclability of these starch-containing polymers.
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