中文摘要：

在采用原位沉析法制备壳聚糖棒材的同时，加入壳聚糖纤维作为增强材料，制成了壳聚糖纤维增强的壳聚糖棒材复合材料。研究了壳聚糖纤维的长度及添加量对壳聚糖棒材力学性能的影响，通过扫描电镜观察分析了材料的断面形貌。结果表明，壳聚糖纤维能显著提高壳聚糖棒材的力学性能，壳聚糖棒材的弯曲强度随壳聚糖纤维添加量的增加先增加而后下降，随着壳聚糖纤维长度的增加而增加。当壳聚糖纤维（17mm）质量分数为5％时，壳聚糖棒材的弯曲强度达到134MPa，与未增强的壳聚糖棒材相比，弯曲强度提高了55．7％。这种纯天然的复合材料在可吸收内固定材料方面将具有广阔的用途。

英文摘要：

The chitosan rods were prepared by in - situ precipitation, and then chitosan fibers were filled into the matrix to reinforce the chitosan composite rod. The mechanical properties of this composite rod were investigated, and the morphology of the fracture surfaces was observed by means of SEM. The results indicate that chitosan fiber can improve the mechanical properties of the chitosan composite rod obviously. It is shown that the flexural strength of the composite is improved firstly and then decreases with increasing the mass fraction of chitosan fiber. Compared with the chitosan rod without chitosam fiber, the flexural strength of the composite increases with increasing the length of chitosan fiber. The flexural strength of the composite increases by 55. 7% when 5% mass fraction of chitosan fiber with the length 17 mm was filled. This kind of chitosan fiber/chitosan composite will be widely used in the field of internal fixation in surgery.