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将天然纤维-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;BC/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。
The natural fiber - bacterial cellulose (BC) was added into the unsaturated polyester resin (UPR) matrix as a reinforcing material. The BC / UPR composites were prepared by RTM. The mechanical properties and hygroscopicity were studied. The degradation of BC / UPR composites was investigated by UV irradiation. The results showed that the mechanical properties of BC / UPR composites were improved by chemical bonding between the hydrophilic natural fibers and the hydrophobic polymer matrix through the surface modification of bacterial cellulose. The fiber volume of BC fiber When the fiber volume fraction is 20%, the tensile strength of the composites reaches up to 152.9 MPa. The moisture absorption of BC / UPR composites accords with Fick’s law, and the hygroscopicity can lead to the decrease of mechanical properties. After the BC / UPR composite absorbs the light, the number of oxygen-containing functional groups on the surface increases and a certain degree of photodegradation occurs.