Question

During drawing crystallinity of a fibre

• A. Increases
• B. Decreases
• C. Remains same
• D. May change in any direction

Hint:

Drawing improves fibre strength by increasing molecular orientation and crystallinity.

Answer 1

The Correct Option is A

Step 1: Understanding fibre drawing.
Drawing is a process in which fibres are stretched to several times their original length. This aligns the polymer chains along the fibre axis.
Step 2: Effect on molecular arrangement.
During drawing, the initially disordered amorphous chains become oriented and pack more closely together, promoting the formation of crystalline regions.
Step 3: Effect on crystallinity.
As molecular alignment improves, crystallinity increases due to better chain packing and enhanced intermolecular bonding.
Step 4: Conclusion.
Hence, crystallinity of a fibre increases during drawing.