临界剪切速率
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The viscosity dropped with the increase of temperature and shearing rate and decreased drastically over critical shearing rate, but remained almost unchanged at lower shearing rates.
纺丝原液粘度随着温度、剪切速率的增大而降低，过了临界切变速率后粘度会急剧下降，但在低剪切速率区粘度基本不变。
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