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← ScienceWhich property change occurs when high molecular weight polyethylene is stretched?
A)Increased crystallinity and tensile strength✓
B)Decreased crystallinity and tensile strength
C)Reduced chain alignment prevails
D)Amorphous regions become cross-linked
💡 Explanation
Stretching polyethylene causes strain-induced crystallization via chain alignment. This orientation increases intermolecular forces, resulting in higher crystallinity and strength. Therefore, tensile strength increases, rather than decreases, because chain alignment occurs promoting crystallization.
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