Elastic Modulus Of Natural Rubber

An elastomer is a polymer with viscoelasticity i e both viscosity and elasticity and has very weak intermolecular forces generally low young s modulus and high failure strain compared with other materials.

Elastic modulus of natural rubber.

The sap which contains a polymer of isoprene called 2 methyl 1 3 butadiene as well as a small percentage of proteins and acetone soluble materials such as. This can be repeated many times with no apparent degradation to the rubber. Elastic modulus in static shear mpa jis k 6380 corres ponding no. 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.

Thomas young his british fellow countryman will leave his name associated to this linear behavior of many materials. He then used a compound with low modulus that deformed easily allowing the door to close easily. Young s modulus is measured during a tensile strength test. Hardness type a tensile strength at break mpa kgf cm 2 elongation at break hardness change type a change rate of tensile strength change rate of elongation at break jis 1 volume change rate jis 3 volume change rate butyl sheet 40 40 38 8 3 85 640 11 4.

E young s modulus of elasticity pa n m 2 lb in 2 psi named after the 18th century english physician and physicist thomas young. Elongation is proportional to applied strength. Natural rubber is widely used in shock and vibration isolators because of its high resilience elasticity high tensile and tear properties and low cost. Natural rubber is derived from a milky suspension found in the milky sap of some plants such as the hevea tree.

There are different types depending on functional groups in the structure and curing mechanisms. A spring is an example of an elastic object when stretched it exerts a. The term a portmanteau of elastic polymer is often used interchangeably with rubber although the latter is preferred when referring to vulcanisates. Takl 5005 60 60 60.

Hardness type a tensile strength at break mpa kgf cm 2 elongation at break hardness change type a change rate of tensile strength change rate of elongation at break black rubber sheet 30 50 48 48 8 9 9 1 600 4 2 7. Silicones are polymers with a si o si backbone. Rubber is a member of a larger class of materials called elastomers and it is difficult to overestimate their economic and. The door was hard to close because the rubber resisted being deformed.

In the case of latex rubber it has an elastic modulus of about 0 1 gpa. Ut tensio sic vis latin sentence from robert hooke 1678 means such extension such strength proportionality rule. Key properties include thermal stability chemical stability electrical insulation and low toxicity. The rubber he used had high modulus.

Gruand méca sarl cy for his redaction. Elastic modulus in static shear jis k 6380 corres ponding no. Elasticity is a property of an object or material indicating how it will restore it to its original shape after distortion. Main applications are flexible seals o rings etc.

Synthetic elas tomers have widely varying static and dynamic properties compared to natural rub ber some of them have much greater resistance to degradation from heat oxidation.