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Natural Rubber, Polyisoprene Properties And Applications


Polyisoprene is also called as natural rubber in market. Because of its characteristics, applications of natural rubber in industry is very common. We discuss its properties and applications of this natural rubber. You can find informations about vulcanization and properties of polyisoprene.

Tyres are very good examples of vulcanized rubbers.

What Is Natural Rubber?

Natural rubber is the long chained elastomer that is constituted with isoprene(C5H8). High molecular weight is most important characteristic of isoprene. Latex is the source of isoprene that is obtained from rubber tress which are grown in tropical regions. Latex is not the pure polyisoprene. It includes high amount of water and other ingridients. Some processes are applied to latex to extract the polyisoprene from it. These processes are generally are coagulation, dying and spraying.

Vulcanization process must be applied to this natural rubber to obtain a useful material. Because natural rubber is very elastic in hot weather and very stiff in cold weather.

Latex extraction from latex tree.

In vulcanization process, cross-linkings are enhanced in natural rubber. With this application, elastomer that has very good resilience property is obtained.

In vulcanization process, sulfur and other chemicals are mixed with natural rubber. Sulfur addition with heat application, cross-linkings are obtained in natural rubber. After the process, vulcanized rubber is obtained. Suldur itself also vulcanize the natural rubber, but it will take hours to obtain desired cross-linked structure. Addtivives are used to accelerate the cross-linking formations in natural rubber.

Vulcanized rubber that is produced from natural rubber has very good tensile strength and resiliance characteristics. But with the heat, oil and sunlight applications, vulcanized rubber can degrade. With the use of some additives, there drawbacks for vulcanized rubber are prevented.

Applications of natural ruıbbers are; show soles, seals, bushings and shock absorbtion.

The most important application of vulcanized rubber is automobile tyres. They have additive called as carbon-black to obtain wear and environmental resistant material.

What Are The Properties Of Polyisoprene Vulcanized Rubber?

Modulus of elasticity of polyisoprene is around 18 MPa in %300 elongation. Also tensile strength of it around 25 MPa. The elongation that is needed to tear apart vulcanized polyisoprene is 700% according to its original shape. It can be used between temperatures of -50C to 80C. It has very big market share in elastomer materials which is around 22% of total elastomer market.

These are the general properties of natural rubber and elastomers. Do not forget to leave your comments and questions about properties and applications of natural rubbers and vulcanization below. Your precious feedbacks are very important for us.

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