Question:medium
Which from following polymers is classified as fibre?
Which from following polymers is classified as fibre?
Show Hint
Polyamides and Polyesters are typical examples of polymer fibres.
Updated On: May 14, 2026
- Nylon 6,6
- Urea formaldehyde resin
- Polystyrene
- Neoprene
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Polymers are classified into four main categories based on the magnitude of intermolecular forces present between their polymer chains:
1. Elastomers (weakest forces, highly stretchable).
2. Thermoplastics (intermediate forces, soften on heating).
3. Fibres (strongest forces, high tensile strength, thread-forming).
4. Thermosetting polymers (highly cross-linked, rigid, infusible).
Step 2: Key Formula or Approach:
Analyze the intermolecular forces associated with each given polymer type.
Fibres require strong intermolecular forces like hydrogen bonding or strong dipole-dipole interactions to maintain a crystalline, aligned structure necessary for high tensile strength.
Step 3: Detailed Explanation:
Let's evaluate the options based on their physical properties and molecular forces:
(B) Urea formaldehyde resin: This is a heavily cross-linked, 3D network polymer. Once formed, it is rigid and cannot be reshaped by heat. It falls under the category of thermosetting polymers.
(C) Polystyrene: This is a linear polymer that softens upon heating and hardens upon cooling without any chemical change. Its chains are held together by moderate Van der Waals forces. It is a thermoplastic polymer.
(D) Neoprene: This is a synthetic rubber. Its polymer chains are held together by very weak intermolecular forces, allowing them to stretch and recoil. It is classified as an elastomer.
(A) Nylon 6,6: This is a polyamide. The polymer chains contain highly polar amide linkages (\( \text{-CO-NH-} \)). These linkages permit the formation of strong intermolecular hydrogen bonds between adjacent chains.
Because of these strong forces, the chains pack closely together, imparting a crystalline nature, high tensile strength, and low elasticity. These are the defining characteristics of fibres. Therefore, Nylon 6,6 is a fibre.
Step 4: Final Answer:
Nylon 6,6 is classified as a fibre.
Polymers are classified into four main categories based on the magnitude of intermolecular forces present between their polymer chains:
1. Elastomers (weakest forces, highly stretchable).
2. Thermoplastics (intermediate forces, soften on heating).
3. Fibres (strongest forces, high tensile strength, thread-forming).
4. Thermosetting polymers (highly cross-linked, rigid, infusible).
Step 2: Key Formula or Approach:
Analyze the intermolecular forces associated with each given polymer type.
Fibres require strong intermolecular forces like hydrogen bonding or strong dipole-dipole interactions to maintain a crystalline, aligned structure necessary for high tensile strength.
Step 3: Detailed Explanation:
Let's evaluate the options based on their physical properties and molecular forces:
(B) Urea formaldehyde resin: This is a heavily cross-linked, 3D network polymer. Once formed, it is rigid and cannot be reshaped by heat. It falls under the category of thermosetting polymers.
(C) Polystyrene: This is a linear polymer that softens upon heating and hardens upon cooling without any chemical change. Its chains are held together by moderate Van der Waals forces. It is a thermoplastic polymer.
(D) Neoprene: This is a synthetic rubber. Its polymer chains are held together by very weak intermolecular forces, allowing them to stretch and recoil. It is classified as an elastomer.
(A) Nylon 6,6: This is a polyamide. The polymer chains contain highly polar amide linkages (\( \text{-CO-NH-} \)). These linkages permit the formation of strong intermolecular hydrogen bonds between adjacent chains.
Because of these strong forces, the chains pack closely together, imparting a crystalline nature, high tensile strength, and low elasticity. These are the defining characteristics of fibres. Therefore, Nylon 6,6 is a fibre.
Step 4: Final Answer:
Nylon 6,6 is classified as a fibre.
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