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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Polymers
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Which one of the following statements is not true?

$\begin {array} {1 1} (a)\;\text{ Natural rubber has Trans configuration at every double bond}\\ (b)\;\text{ Buna –s is a copolymer of butadiene aandstyrene} \\ (c)\;\text{ Natural rubber is 1-4 polymer of isoperene}\\ (d)\;\text{ Vulcanisation is the process of formation of sulphur bridfes between different chains} \end {array}$

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Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree. Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene), which is a conjugated diene hydrocarbon as mentioned above.  In natural rubber, most of the double fonds formed in the polymer chain have the Z configuration, resulting in natural rubber's elastomer qualities.
Charles Goodyear accidentally discovered that by mixing sulfur and rubber, the properties of the rubber improved in being tougher, resistant to heat and cold, and increased in elasticity. This process was later called vulcanization after the Roman god of fire. Vulcanization causes shorter chains to cross link through the sulfur to longer chains. The development of vulcanized rubber for automobile tires greatly aided this industry.
Ans : (a)
answered Mar 11, 2014 by thanvigandhi_1
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