TiO_2增强桉木/聚氯乙烯复合材料耐腐蚀性能
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摘要
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TiO_2制备TiO_2-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TiO_2-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:TiO_2可提高桉木/PVC复合材料的耐霉菌腐蚀性能,TiO_2添加量为2wt%时,TiO_2-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TiO_2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%TiO_2-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;TiO_2添加量较高时会影响桉木纤维与PVC的界面结合,致使TiO_2-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,TiO_2 was added to prepare TiO_2-eucalyptus/PVC composites.The TiO_2-eucalyptus/PVC composites were subjected to the mold accelerated corrosion test,the accelerated corrosion conditions:the temperature was28℃ and the humidity was 85%.The color difference,mechanical properties,water absorption performance,the functional groups,microtopography and thermal stability of TiO_2-eucalyptus/PVC composites before and after corrosion were tested and analyzed.The results show that TiO_2 can improve the mold corrosion resistance of eucalyptus/PVC composite.The TiO_2-eucalyptus/PVC composites present less mold phase when the TiO_2 adding amount is2 wt% after corrosion.The color difference and water absorption of TiO_2-eucalyptus/PVC composites decrease by69.32%and 13.33%respectively in comparison to the composites without TiO_2.And the tensile strength,impact strength,bending strength and bending modulus of TiO_2-eucalyptus/PVC composites increase by 31.17%,39.44%,40.75% and 10.99%,respectively.The 2 wt%TiO_2-eucalyptus/PVC composite obtained at higher thermal decomposition temperature in each stage indicates the better thermal stability.The more TiO_2 content will affect the interface of eucalyptus fiber and PVC,making it to be more susceptible to mold corrosion.
In order to improve the aspergillus niger corrosion resistance of eucalyptus/polyvinyl chloride(PVC)composites,TiO_2 was added to prepare TiO_2-eucalyptus/PVC composites.The TiO_2-eucalyptus/PVC composites were subjected to the mold accelerated corrosion test,the accelerated corrosion conditions:the temperature was28℃ and the humidity was 85%.The color difference,mechanical properties,water absorption performance,the functional groups,microtopography and thermal stability of TiO_2-eucalyptus/PVC composites before and after corrosion were tested and analyzed.The results show that TiO_2 can improve the mold corrosion resistance of eucalyptus/PVC composite.The TiO_2-eucalyptus/PVC composites present less mold phase when the TiO_2 adding amount is2 wt% after corrosion.The color difference and water absorption of TiO_2-eucalyptus/PVC composites decrease by69.32%and 13.33%respectively in comparison to the composites without TiO_2.And the tensile strength,impact strength,bending strength and bending modulus of TiO_2-eucalyptus/PVC composites increase by 31.17%,39.44%,40.75% and 10.99%,respectively.The 2 wt%TiO_2-eucalyptus/PVC composite obtained at higher thermal decomposition temperature in each stage indicates the better thermal stability.The more TiO_2 content will affect the interface of eucalyptus fiber and PVC,making it to be more susceptible to mold corrosion.
引文
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[15]罗燕.基于天然纤维素物质的二氧化钛纳米复合材料的制备及性质研究[D].杭州:浙江大学,2015.LUO Y.Fabrication and applications of hierarchical titaniacontaining nanocomposite materials based on natural cellulose substance[D].Hangzhou:Zhejiang University,2015(in Chinese).
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[18] CHEN S G,GUO Y J,ZHONG H Q,et al.Synergistic antibacterial mechanism and coating application of copper/titanium dioxide nanoparticles[J].Chemical Engineering Journal,2014,256:238-246.
[19] LI B,ZHANG Y,YANG Y Z,et al.Synthesis,characterization,and antibacterial activity of chitosan/TiO2nanocomposite against Xanthomonas oryzae pv.oryzae[J].Carbohydrate Polymers,2016,152:825-831.
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[23] JIANG L P,HE C X,FU J J,et al.Wear behavior of straw fiber-reinforced polyvinyl chloride composites under simulated acid rain conditions[J]. Polymer Testing,2017,62:373-381.
[24]中国国家标准化管理委员会.建筑材料及制品的湿热性能吸湿性能的测定:GB/T 20312—2006[S].北京:中国标准出版社,2006.Standardization Administration of the People’s Republic of China.Hygrothermal performance of building materials and products:Determination of hygroscopic sorption properties:GB/T 20312—2006[S].Beijing:China Standards Press,2006(in Chinese).
[25]刘晓闰,唐萌.纳米二氧化钛的毒性研究与安全性展望[J].东南大学学报(医学版),2011,30(6):945-952.LIU X R,TANG M.Toxicity research and safety prospect of nanoscale titanium dioxide[J].Journal of Southeast University(Medical Science Edition),2011,30(6):945-952(in Chinese).
[26]赵洋.纳米结构二氧化钛的制备及其对制革污染物的光电催化性能研究[D].北京:北京化工大学,2017.ZHAO Y.Preparation of nanostructured titanium dioxide and study on photocatalytic performance for efficient removal pollutants in leather industry[D].Beijing:Beijing University of Chemical Technology,2017(in Chinese).
[27] POP C S,HUSSIEN M D,POPA M,et al.Metallic-based micro and nanostructures with antimicrobial activity[J].Current Topics in Medicinal Chemistry, 2015, 15(16):1577-1582.
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