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← ScienceWhich outcome happens to polyethylene under tensile stress due to crystallinity?
A)Reduced crack propagation vulnerability✓
B)Increased elongation until fracture
C)Elevation of thermal decomposition rate
D)Decreased chemical reactivity quickly
💡 Explanation
Crystallinity induces strain-induced hardening because tie chains between crystalline lamellae become aligned, resulting in increased tensile strength via strain hardening rather than immediate ductile yielding. Hence, crack propagation decreases because of aligned polymer chains.
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