Rubber elasticity refers to a property of crosslinked rubber: it can be stretched by up to a factor of 10 from its original length and, when released, returns very nearly to its original length. This can be repeated many times with no apparent degradation to the rubber. Rubber is a member of a larger class of materials called elastomers and it is difficult to overestimate their economic and technological importance. Elastomers have played a key role in the development of new technologies in the 20th century and make a substantial contribution to the global economy.[citation needed] Rubber elasticity is produced by several complex molecular processes and its explanation requires a knowledge of advanced mathematics, chemistry and statistical physics, particularly the concept of entropy. Entropy may be thought of as a measure of the thermal energy that is stored in a molecule.
Common rubbers, such as polybutadiene and polyisoprene (also called natural rubber), are produced by a process called polymerization. Very long molecules (polymers) are built up sequentially by adding short molecular backbone units through chemical reactions. A rubber polymer follows a random, zigzag path in three dimensions, intermingling with many other rubber molecules. An elastomer is created by the addition of a few percent of a cross linking molecule such as sulfur. When heated, the crosslinking molecule causes a reaction that chemically joins (bonds) two of the rubber molecules together at some point (a crosslink). Because the rubber molecules are so long, each one participates in many crosslinks with many other rubber molecules forming a continuous molecular network.
As a rubber band is stretched, some of the network chains are forced to become straight and this causes a decrease in their entropy. It is this decrease in entropy that gives rise to the elastic force in the network chains.
Rubberelasticity refers to a property of crosslinked rubber: it can be stretched by up to a factor of 10 from its original length and, when released,...
comparison to other traditional engineering materials. In addition to its rubberelasticity and viscoelasticity, hydrogels have an additional time dependent deformation...
Rubber, also called India rubber, latex, Amazonian rubber, caucho, or caoutchouc, as initially produced, consists of polymers of the organic compound...
subsequent stress-strain response is again described by that of rubberelasticity. Soft elasticity has also been exploited to develop materials with unique and...
EPDM rubber (ethylene propylene diene monomer rubber) is a type of synthetic rubber that is used in many applications. EPDM is an M-Class rubber under...
synthetic rubber, most rubber bands are primarily manufactured using natural rubber because of its superior elasticity. Natural rubber originates from the...
strands between crosslinks act as entropic springs, gels demonstrate elasticity like rubber (which is just a polymer network, without solvent). This is so because...
protein found in many insects and other arthropods. It provides soft rubber-elasticity to mechanically active organs and tissue; for example, it enables...
reduces the entropy (this is a property of a rubber bands due to rubberelasticity). Holding the rubber band in tension at ambient temperature is an isochoric...
Many viscoelastic materials exhibit rubber like behavior explained by the thermodynamic theory of polymer elasticity. Some examples of viscoelastic materials...
range of processes for hardening rubbers. The term originally referred exclusively to the treatment of natural rubber with sulfur, which remains the most...
elastomers, such as natural rubber or silicone, but still has enough elasticity to form an airtight seal. While butyl rubber will break down when exposed...
(top-level domain) for the city of Ghent Gent (hyperelastic model), rubberelasticity model Gent Cakaj (born 1990), Albanian politician Gent Strazimiri...
Elasticity theory primarily develops formalisms for the mechanics of solid bodies and materials. (Note however, the work done by a stretched rubber band...
Silicone rubber is an elastomer (rubber-like material) composed of silicone—itself a polymer—containing silicon together with carbon, hydrogen, and oxygen...
The Gent hyperelastic material model is a phenomenological model of rubberelasticity that is based on the concept of limiting chain extensibility. In this...
chemical process for converting natural rubber or related polymers into materials of varying hardness, elasticity, and mechanical durability by heating...
to the above-mentioned attractive interactions due to the chain's rubberelasticity. Because of its connectivity, the behavior of the polyelectrolyte...
Polybutadiene [butadiene rubber, BR] is a synthetic rubber. It offers high elasticity, high resistance to wear, good strength even without fillers, and...
theory of rubberelasticity, including the first theoretical description of statistical mechanics of polymers with application to viscosity and rubber elasticity...
latex tapped from rubber trees, and can be filled with air, helium, water, or any other suitable liquid or gas. The rubber'selasticity makes the volume...
(assumed constant or weakly pressure dependent bulk modulus). Since linear elasticity is a direct result of interatomic interaction, it is related to the...
the rubber particles in suspension and (b) crumb rubber is prone to degradation (devulcanization and depolymerization) and thus lose its elasticity if...
temperatures on the resilience of the rubber O-rings. As the colder temperatures lowered the elasticity of the rubber O-rings, the engineers feared that...
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