Polymers

Long Answer Type

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What are linear polymer and branched chain polymers? How do these differ from own linked polymers?

Linear polymers are well packed and have high densities, high tensile strength and also have a high melting point, e.g., high-density polyethene.

Branched chain polymers are irregularly packed and have lower tensile strength and lower melting point than linear polymers, e.g., low-density polythene. These are different from cross-linked
polymers in the sense that the cross-linked polymers are hard, rigid and brittle e.g., bakelite.
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    Short Answer Type

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

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    Write the names and molecular structure of the monomers of the following:
    (i) Natural rubber (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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    Give the monomers and uses of each of the following addition polymers:
    (a) Polyethylene    

    (b) Polypropylene       

    (c) Polystyrene.

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    Elaborate the structure of natural rubber.

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    Explain how does 1, 3-butadiene polymerize by different routes?
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    Why does styrene undergo anionic polymerization easily?
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    Short Answer Type

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

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

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