Rubber band

A rubber band is a loop of elastic material that holds objects together by stretching around them. Its tension comes from the material’s tendency to return to its unstretched shape.

Elasticity: The ability of a material to deform under force and recover its original shape when the force is removed. A rubber band’s grip and recoil arise from elastic deformation.
Natural rubber: An elastic polymer obtained chiefly from the latex of the rubber tree, Hevea brasiliensis. Many rubber bands are made from this material, often blended with additives.
Office supplies: Tools and consumable materials commonly used for administrative and desk work. Rubber bands are standard office supplies for bundling papers and small objects.
Elastic potential energy: Energy stored when an elastic object is deformed from its relaxed shape. A stretched band stores energy that is released as it recoils or breaks.
Polymer: A substance made of molecules composed of repeating structural units linked into long chains. Rubber’s long molecular chains allow large stretches and entanglement.
Latex: A stable dispersion of polymer particles in water, produced naturally by some plants or manufactured synthetically. Rubber-tree latex is the raw material from which natural rubber is collected.
Produce packaging: Packaging methods used to contain and protect fruits and vegetables during handling and sale. Bands bundle vegetables such as asparagus without requiring a rigid fastener.
Hysteresis: A dependence of a system’s response on its history, often seen as energy loss during a loading-and-unloading cycle. A rubber band returns less mechanical energy than was put into stretching it.
Entropy elasticity: Elastic behavior driven by a system’s tendency toward more probable, disordered molecular arrangements. Rubber chains recoil mainly because stretching aligns them and reduces their conformational entropy.
Vulcanization: A process that cross-links rubber molecules, commonly using sulfur and heat, to improve its strength and resilience. Cross-linking helps rubber bands resist permanent deformation and wear.

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PolyisopreneBroader topic: Its stretch and recovery commonly come from polyisoprene rubber.