Out of these we are describing preparation of two synthetic rubbers which are part of your syllabus as well – Over 20 types of synthetic rubbers are available today. Neoprene is a synthetic rubber made up of monomer unit chloroprene. Although the basic monomer unit for synthetic rubber can be 2-chloro -1,3-butadien or 1,3-butadiene. So, all polymers or synthetic rubbers have different monomer units as well. Many types of synthetic rubber have been synthesized. It is synthesized under controlled conditions by petrochemicals. It is soluble in solvents like ether, CCl 4, petrol etc. It can be used over a wide range of temperatures (-40 ⁰C to 100 ⁰C ). It can be used over a narrow range of temperature (10-60 ⁰C ). Vulcanization of rubber was discovered by Charles Goodyear in 1839.Ĭomparison Between Natural Rubber and Vulcanized Rubber In general, natural rubber is very sticky in nature, but vulcanization removes its stickiness and enhances its qualities. Reaction of natural rubber with sulfur molecule (S 8 ) in presence of heat to improve its properties is called vulcanization of rubber. It is a polymer of 2-methyl 1,3-butadiene (or isoprene). Then it is processed for common use by various methods. Natural rubber or rubber latex is directly collected from plants. Structure of Natural Rubber – It is called polyisoprene or cis-1,4-polyisoprene. Monomer Unit of Natural Rubber – 2-methyl 1,3-butadiene (it is also called isoprene) Leading producers of natural rubber are Thailand and Indonesia. Natural rubber is also called India rubber, Amazonian rubber and caucho. This is the reason natural rubber is also known as latex. The milky white fluid which is obtained from trees is called latex.
Natural rubber is a natural polymer of organic compound isoprene obtained from the bark of tropical and subtropical trees. There is a wide variety of synthetic rubber available such as EPDM (Ethylene Propylene Diene Monomer) rubber, commercial black rubber, SBR (Styrene butadiene rubber), NBR (nitrile butadiene rubber), IIR (Isobutylene-isoprene) etc. Rubber can be divided into following two types based on its origin –
But during the 19th century it became a highly useful industrial raw product for various purposes. We have been using rubber products since ancient times.
It occurs naturally and can be synthesized as well. Rubber is a polymer which can stretch and shrink. Soon we felt the need for synthetic rubber production. Initially, we used to get rubber from natural sources only, but due to its versatile uses, natural rubber was not able to fulfill all our needs. Rubber is one of the most important products of rainforests which we have been using for over 1000 years in various fields. Do you know what they are made of? Well, all these are made of rubber. You must have used an eraser while writing or an elastic hair band to tie your hair.
0 kommentar(er)
