Which of the following polymers are linear polymers with flexible chains?
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A.
Phenolics
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B.
Epoxies
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C.
Network polymers
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D.
Polyethylene
Correct Answer:
D. Polyethylene
Explanation:
Polyethylene is classified as a linear polymer with flexible chains. In its high-density form (HDPE), the molecular structure consists of long, straight sequences of monomers with minimal branching, allowing the chains to pack closely together. Despite this high packing density and crystallinity, the single covalent bonds within the carbon backbone permit the chains to rotate and move, providing the material with its characteristic flexibility. In contrast, phenolics, epoxies, and other network polymers undergo extensive cross-linking to form rigid, three-dimensional structures that lack the chain mobility found in linear polymers.
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