Question

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Q:The correct statement among the following is -

1) linear polymers have high melting point than cross linked polymer with the same molecular mass.

2) linear polymer is less dense than branched polymer.

3) low density polyethylene is formed due to the high linearity of the structure.

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Answer 1

★CORRECT STATEMENT :-

• ➪linear polymers have high melting point than cross linked polymer with the same molecular mass.

★LET'S SEE THE REASON :-

• The polymers in which the constituent monomeric units are joined to form long straight chains are called linear polymers or straight chain polymers.

• In such polymers, the polymeric chains stack over one another and form well packed structure .

• Due to this close packing , they have high density, high tensile strength and high melting point .

• If the polymer chain has no branches, they pack close to each other and the material has high density.

• High density polythene (HDPE) is a linear polymer.

Answer 2

Explanation:

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1) Polymers are macromolecules that are made out of many monomers bonded to each other. ... The main difference between linear polymers and crosslinked polymers is that linear polymers are straight chain structures whereas crosslinked polymers are branched structures.

2) Branched polymers resemble linear polymers with the addition of shorter chains hanging from the spaghetti backbone. Since these shorter chains can interfere with efficient packing of the polymers, branched polymers tend to be less dense than similar linear polymers

LLDPE is produced by polymerization of ethylene (or ethane monomer) with 1-butene and smaller amounts of 1-hexene and 1-octene, using Ziegler-Natta or metallocene catalysts.