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- 2019
TiO2增强桉木/聚氯乙烯复合材料耐腐蚀性能
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Abstract:
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。 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. 国家科技支撑计划（2011BAD20B202-2
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