Question

$[NH(CH_2)NHCO(CH_2)_4CO]_{n}$ is a:-

• A. copolymer
• B. addition polymer
• C. thermo-setting polymer
• D. homopolymer

Answer 1

The Correct Option is A

To determine the type of polymer described by the formula $[NH(CH_2)NHCO(CH_2)_4CO]_{n}$, let's break down the components of the polymer and analyze them in terms of their polymerization characteristics.

1. Analyzing the Structure: The given polymer structure, $[NH(CH_2)NHCO(CH_2)_4CO]_{n}$, represents a repeating unit between amide linkages $NHCO$ and includes alkyl chains $(CH_2)$. The presence of both amine ($NH$) and carbonyl ($CO$) groups indicates the occurrence of amide bond formation, which is typical in polyamides.
2. Defining Copolymer: A copolymer is formed when two or more different monomers unite to form the polymer. Here, the repeating unit consists of two types of monomers: one contributing the $NH(CH_2)NH$ group and another contributing the $CO(CH_2)_4CO$ group.
3. Eliminating Other Options:
   • Addition Polymer: This type involves the polymerization of monomers without the loss of any small molecules. The structure involves the loss of water during amide bond formation, so it's not an addition polymer.
   • Thermo-setting Polymer: Typically melts on heating and becomes irreversibly hard. The provided structure is not indicative of a thermo-setting polymer but more of a thermoplastic polymer.
   • Homopolymer: Formed from only one type of monomer. The structure clearly has multiple repeating units from different monomers.
4. Conclusion: Based on the structure, chemical bonds, and the polymerization method involved, the compound $[NH(CH_2)NHCO(CH_2)_4CO]_{n}$ is a copolymer, as it involves different monomeric units forming a polymer through condensation polymerization.