中文摘要：

将天然纤维一细菌纤维素（BC）作为增强材料加入不饱和聚酯树脂（UPR）基体中，采用RTM工艺制备BC／UPR复合材料，并对其力学性能、吸湿性能进行了研究。通过紫外辐照方法探讨了BC／UPR复合材料的降解性能。研究结果表明：通过对细菌纤维素的表面改性，在亲水性的天然纤维和疏水性的高聚物基体之间形成了化学键结合，提高了BC／UPR复合材料的力学性能；BC纤维体积分数的增加也有助于提高力学性能，当纤维体积分数为20％时，该复合材料拉伸强度最高可达152．9MPa；BC／UPR复合材料的吸湿过程符合Fick定律，吸湿可导致力学性能下降；BE／UPR复合材料吸收光能后，表面含氧官能团数量增加，发生一定程度的光降解。

英文摘要：

By using natural fiber--bacterial cellulose （BC） as the reinforcement and unsaturated polyester resin （UPR） as the matrix, natural fiber BC/UPR composites were prepared by the RTM process. The mechanical properties, moisture absorption and degradation of the composites were studied. The results show that chemical bonds are formed at the interface of the BC/UPR composites through surface treatment of BC, which enhances the mechanical properties of the composites. With the increasing fiber volume fraction, the BC/UPR composites get an increase in tensile strength as well as a decrease in elongation at break. The besl tensile strength of 152.9 MPa can be obtained for the composites with a fiber volume fraction of 20 %. The processes of moisture absorption of the BC/ UPR composites, which lower the mechanical properties, can be described by Fick＇s I.aw. UV radiation tests were carried out on the BC/UPR composites. XPS results prove that an oxidative degradation takes place and the contents of oxygenic functional groups increase when the materials are exposed to ultraviolet radiation, which induces photodegradation in the BC/UPR composites.