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Explain how does 1,3-butadiene polymerize by different routes ? |
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Answer» Solution :1,3-Butadiene is a conjugated diene. It can polymerize either by 1,4-addition or by 1,2-addition MECHANISM as shown below : (i) 1,4-Polymerization : When the polymerization occurs at the terminal CARBON atoms , i.e., `C_1 and C_4` of 1,3-butadiene molecules , an unbranched POLYMER is formed.  Each repeating unit of this polymer contains a double bond , each carbon ATOM of which has two DIFFERENT substituents , therefore , these polymers can exist in two geometrical isomeric forms , i.e., forms , i.e., cis -and trans. (ii) 1,2-Polymerization : Alternatively , 1,3, butadine can undergo polymerization at `C_1 and C_2` positions of 1,3-butadiene to yield the branched polymer called polyvinlylpolythene.
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