Question:
The polyester (PET) fibre spun by high speed spinning technology shows high crystalline orientation but low birefringence due to
The polyester (PET) fibre spun by high speed spinning technology shows high crystalline orientation but low birefringence due to
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Birefringence = Orientation of Crystals + Orientation of Amorphous parts. If the amorphous parts are unoriented, total birefringence stays low.
Updated On: May 26, 2026
- oriented crystalline and amorphous regions
- oriented crystalline but unoriented amorphous regions
- unoriented crystalline but oriented amorphous regions
- Unoriented crystalline and amorphous regions
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The Correct Option is B
Solution and Explanation
Concept:
Total fiber orientation is measured by Birefringence, which is a combination of the orientation in both the crystalline and amorphous phases.
Step 1: High-Speed Spinning Dynamics.
In high-speed spinning technology, crystals form instantly as the fiber cools.
Step 2: Crystalline Orientation.
Because these crystals form under immense tension, they are highly aligned (oriented) along the fiber axis.
Step 3: Amorphous Region Behavior.
However, the process happens so fast that the amorphous regions remain relatively unoriented. This lack of alignment in the amorphous phase results in a low total birefringence value.
Step 1: High-Speed Spinning Dynamics.
In high-speed spinning technology, crystals form instantly as the fiber cools.
Step 2: Crystalline Orientation.
Because these crystals form under immense tension, they are highly aligned (oriented) along the fiber axis.
Step 3: Amorphous Region Behavior.
However, the process happens so fast that the amorphous regions remain relatively unoriented. This lack of alignment in the amorphous phase results in a low total birefringence value.
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