Polymers

Long Answer Type

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Explain how does 1, 3-butadiene polymerize by different routes?

1,2-polymerization. 1, 3-butadiene can undergo polymerization at C1, and C2 to yield the polymeric product, polyvinyl polythene.



(ii) 1,4-polymerization. When the polymerization takes place at C1, and C4 of butadiene, an unbranched polymer is formed. A carbon bond at each of its carbons is substituted by different groups and hence exist either as trans-polybutadiene or cis-polybutadiene or a mixture as shown below:

R* + CH3 = CH–CH = CH2 → R–CH2–C*H–CH = CH2
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    Give the monomers and uses of each of the following addition polymers:
    (a) Polyethylene    

    (b) Polypropylene       

    (c) Polystyrene.

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    Short Answer Type

    Write the names and molecular structure of the monomers of the following:
    (i) Natural rubber (ii) Neoprene.

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    Explain with suitable examples:
    (i)    Natural polymers
    (ii)   Synthetic polymers.

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    Define a polymer. Write the monomer used for the preparation of dacron. Mention a use of it.

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    Long Answer Type

    Elaborate the structure of natural rubber.

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    Why does styrene undergo anionic polymerization easily?
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    What are linear polymer and branched chain polymers? How do these differ from own linked polymers?

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    Short Answer Type

    Write the names and structures of the monomers of the following polymers:
    (i) Polystyrene (ii) Neoprene.

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    Long Answer Type

    How does the presence of benzoquinone inhibit the free radical polymerization of a vinyl derivative?
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