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Why Rubber Bands Snap Back After Stretching
为什么橡皮筋拉伸后会弹回原状
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Rubber bands are made of long, tangled polymer chains.橡皮筋由长而缠绕的聚合物链构成。
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When stretched, chains straighten and align in one direction.拉伸时，这些链会变直并朝同一方向排列。
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Weak forces between chains hold them together loosely.链间微弱的作用力使它们松散地结合在一起。
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When released, chains quickly twist back into their relaxed shape.松开后，链迅速扭回松弛状态。
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This elasticity comes from molecular spring-like behavior.这种弹性源于分子类似弹簧的行为。
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Heat makes rubber bands snap back faster and stronger.受热会使橡皮筋回弹得更快、更强。
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Overstretching breaks some chains permanently.过度拉伸会永久性地扯断部分链。
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That’s why old bands lose their bounce over time.因此旧橡皮筋会随时间推移逐渐失去弹性。