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Synthetic Rubber receive

 

The rapid development of industries in the early 20th century, there was a huge demand for rubber. But natural rubber was too small to meet these needs. So sharply question of obtaining synthetic rubber. In the late 20’s of our century Leningrad chemists led by SV Lebedev developed a method of producing rubber from ethyl alcohol and then polymerizing it to metallic sodium. Based on this method in our country was founded the world’s first commercial production of synthetic rubber.

Synthetic rubber is synthetic polymers capable of processing the rubber by vulcanization, make up the bulk of elastomers.

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Synthetic rubber is high polymer, rubber-like material. It is obtained by polymerization or copolymerization of butadiene, styrene, isoprene, isobutylene, acrylonitrile. Like natural rubber, synthetic macromolecular chains are long, sometimes branched, with an average molecular weight equal to the hundreds of thousands and even millions. Polymer chains in the synthetic rubber in most cases of double bonds by which the vulcanization forming the space lattice, obtained with the tires, acquires characteristic physical and mechanical properties.

Usually made of rubber and the name of the classification for monomers used for the receipt (isoprene, butadiene, etc.), or by a characteristic group (atoms) in the main chain or side groups (urethane, polysulfide, etc.) Synthetic rubbers are also divided on the grounds of For example, the content of fillers (filled and unfilled), molecular weight (consistency) and final form (solid, liquid, poroshkoobr.). Part of the synthetic rubber produced in the form of aqueous dispersions – synthetic latex. A special group of rubbers are thermoplastic elastomers. Some types of synthetic rubber are completely marginal connection, so for curing the use of organic peroxides, amines and other substances. Certain types of synthetic rubber on a number of technical properties than natural rubber.
By application area is divided into synthetic rubbers general and special purposes. For general purpose rubber rubbers include complex enough high technical properties (strength, elasticity, etc.), suitable for mass production of a wide range of products. For special-purpose rubbers include one or more properties to ensure fulfillment of specific requirements for the product and efficiency in the yoke of the often extreme conditions.