Question

Which one of the following polymers is not obtained by condensation polymerization

• A. Bakelite
• B. Nylon 6
• C. Buna-N
• D. Nylon 6, 6

Answer 1

The correct option is C

Buna-N

The explanation for the correct option:

Option C:

Copolymers of 1,3-Butadiene $\left({\mathrm{C}}_4{\mathrm{H}}_6\right)$ and Acrylonitrile $\left({\mathrm{C}}_3{\mathrm{H}}_3\mathrm{N}\right)$ exist. It's also known as nitrile rubber $\left(\mathrm{NBR}\right)$. It's used to make oil seels, tank linings, and protective gloves. It is made by polymerizing 1,3-Butadiene and Acrylonitrile in the presence of Salt $\left(\mathrm{NaCl}\right)$.

The explanation for the incorrect option:

Option A:

Bakelite was a chemically resistant, rigid, infusible plastic created from a chemical mixture of Phenol $\left({\mathrm{C}}_6{\mathrm{H}}_6\mathrm{O}\right)$ and formaldehyde $\left({\mathrm{CH}}_2\mathrm{O}\right)$ phenol-formaldehyde resin $\left({\mathrm{C}}_8{\mathrm{H}}_6{\mathrm{O}}_2\right)$, two substances obtainable at the time from coal tar and wood alcohol Methanol $\left({\mathrm{CH}}_3\mathrm{ON}\right)$.

Option B:

Caprolactam $\left({\mathrm{C}}_6{\mathrm{H}}_{11}\mathrm{NO}\right)$ is converted to nylon 6 by ring-opening polymerization. Caprolactam, which includes six carbon atoms, is used to create Nylon 6. Caprolactam is heated to roughly $533\mathrm{K}$ in an inert Nitrogen $\left(\mathrm{N}2\right)$ environment for 4–5 hours, which causes the ring to shatter and polymerize.

Chemical formula: $\left(\mathrm{C}6\mathrm{H}11\mathrm{NO}\right)\mathrm{n}$

Melting point: $220°\mathrm{C}(493\mathrm{K})$

Autoignition temperature: $434°\mathrm{C};813°\mathrm{F};707\mathrm{K}$

CAS Number: $25038-54-4$

Option D:

Nylon 66 $({\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{N}}_2{\mathrm{O}}_{2)\mathrm{n}}$ also known as Nylon 6-6, Nylon 6/6, nylon 6,6, or Nylon 6:6 is a polyamide or Nylon used to make clothing. It, along with Nylon 6, is the most widely used textile and plastic sector. Hexamethylenediamine $({\mathrm{C}}_6{\mathrm{H}}_{16}{\mathrm{N}}_{2)}$ and Adipic acid $\left({\mathrm{C}}_6{\mathrm{H}}_{10}{\mathrm{O}}_4\right)$, which give Nylon 66 its name, are two monomers each having six Carbon $\left({\mathrm{CO}}_2\right)$ atoms.

Conclusion:

Buna-monomers N's are $1,3$-Butadiene and Acrylonitrile. Buna-N is a copolymer, hence it's a copolymer.