采用傅里叶红外光谱和交叉极化结合魔角旋转技术13C核磁共振研究了纤维回用次数对其超分子结构的影响.结果表明,与原纤维相比,经过1次、3次和5次回用后的纤维素分子间氢键O(6)H…O(3′)的相对含量分别增加了7.49％、9.24％和11.98％,证实了1次回用对纤维氢键结构影响最大.另外随着纤维回用次数的增加,基原纤尺寸稳定在3.94nm～4.49 nm之间;5次回用后基原纤聚集尺寸从原纤维的11.69nm增至23.96 nm,表明了回用对纤维聚集态结构产生了影响.
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