TiO2增强桉木/聚氯乙烯复合材料耐腐蚀性能

为改善桉木/聚氯乙烯（PVC）复合材料耐霉菌（黑曲霉）腐蚀性能，添加TiO₂制备TiO₂-桉木/PVC复合材料，并对复合材料进行霉菌加速腐蚀试验（加速腐蚀条件:温度为28℃，湿度为85%）。对比研究了腐蚀前后TiO₂-桉木/PVC复合材料的色差、力学和吸水性能及官能团、微观形貌和热稳定性变化。结果表明:TiO₂可提高桉木/PVC复合材料的耐霉菌腐蚀性能，TiO₂添加量为2wt%时，TiO₂-桉木/PVC复合材料腐蚀后表观霉菌相对较少，色差值和吸水率较未添加TiO₂的桉木/PVC复合材料分别降低了69.32%和13.33%；拉伸、冲击及弯曲强度、弯曲模量分别提高了31.17%、39.44%、40.75%、10.99%；2wt% TiO₂-桉木/PVC复合材料热分解各阶段失重温度较高，热稳定性较好；TiO₂添加量较高时会影响桉木纤维与PVC的界面结合，致使TiO₂-桉木/PVC复合材料更易受到霉菌的腐蚀。 

Corrosion resistance of TiO2 reinforced eucalyptus/polyvinyl chloride composites

In order to improve the aspergillus niger corrosion resistance of eucalyptus/polyvinyl chloride (PVC) composites, TiO₂ was added to prepare TiO₂-eucalyptus/PVC composites. The TiO₂-eucalyptus/PVC composites were subjected to the mold accelerated corrosion test, the accelerated corrosion conditions:the temperature was 28℃ and the humidity was 85%. The color difference, mechanical properties, water absorption performance, the functional groups, microtopography and thermal stability of TiO₂-eucalyptus/PVC composites before and after corrosion were tested and analyzed. The results show that TiO₂ can improve the mold corrosion resistance of eucalyptus/PVC composite. The TiO₂-eucalyptus/PVC composites present less mold phase when the TiO₂ adding amount is 2wt% after corrosion. The color difference and water absorption of TiO₂-eucalyptus/PVC composites decrease by 69.32% and 13.33% respectively in comparison to the composites without TiO₂. And the tensile strength, impact strength, bending strength and bending modulus of TiO₂-eucalyptus/PVC composites increase by 31.17%, 39.44%, 40.75% and 10.99%, respectively. The 2wt%TiO₂-eucalyptus/PVC composite obtained at higher thermal decomposition temperature in each stage indicates the better thermal stability. The more TiO₂ content will affect the interface of eucalyptus fiber and PVC, making it to be more susceptible to mold corrosion.