目的 通过对纸浆纤维进行不同的碎浆机械作用，研究纤维分子结构、纤维形态与纸张强度性能三者的相关关系。方法 在不同碎浆时间条件下，测量纸张的抗张指数、零距抗张强度、Z向抗张强度等拉伸相关力学性能，并通过生物显微镜、扫描电镜观察纸张内部的纤维形态，采用傅里叶红外光谱和X射线衍射分析纸张中官能团、氢键和结晶度等分子结构的变化规律，从而探究纤维分子结构、纤维形态对纸样性能的影响趋势。结果 随着碎浆时间的增加，纤维结晶度、分子间氢键和纸样拉伸性能均呈现出了先上升后下降的趋势，在14 min时纤维结晶度、分子间氢键含量和纸张的抗张指数均达到最大值，分别为79.63%、43.64%和45.25 N.m/g。结论 一定碎浆时间范围内，纸张的拉伸性能和纤维分子结构(结晶度、分子间氢键等)随纤维尺寸的减小和帚化率的提高呈现出先上升后下降的趋势。

The work aims to study the correlation of fiber molecular structure, fiber morphology and paper strength by applying different beating mechanical effects on pulp fibers. The tensile related mechanical properties, such as tensile index, zero-span tensile strength and Z-direction tensile strength of the paper for different pulping time were measured. The fiber morphologies in the paper were observed by biological microscopy and scanning electron microscope. The functional groups, hydrogen bonds and crystallinity of the paper were analyzed by Fourier transform infrared spectroscopy and X-ray diffraction. With the increase of pulping time, the fiber molecular structure and properties of the paper firstly increased and then decreased. The fiber crystallinity, intermolecular hydrogen bond content, and tensile index of the paper all reached their maximum values at the 14th min, which were 79.63%, 43.64%, and 45.25 N.m/g, respectively. Within a certain range of pulping time, the tensile properties and molecular structure of fibers, such as crystallinity and intermolecular hydrogen bonds of the paper, show a trend of firstly increasing and then decreasing with the decrease of fiber size and the increase of brooming rate.