Water absorption and mold susceptibility of wood flour/polypropylene composites modified with silane-wax emulsions
Water absorption and mold susceptibility of wood flour/polypropylene composites modified with silane-wax emulsions
复制标题
硅烷蜡乳液改性木粉/聚丙烯复合材料的吸水率和霉菌敏感性
DOI：
10.1002/pc.24616
复制
发表时间：
2019-01-01
影响因子：
5.2
通讯作者：
Cao, Jinzhen
中科院分区：
文献类型：
--
作者：
Chen, Yu;Guo, Xi;Cao, Jinzhen
由于木粉的吸湿性，木塑复合材料在室外应用中可以吸收水分。吸附-解吸过程的循环破坏了WF与聚合物基体之间的界面结合，有利于真菌的侵袭。分别用硅烷、蜡乳液及其复合体系对WF进行不同浓度（1%、2%和4%）的浸渍改性。然后将改性后的WF与聚丙烯（PP）按质量比6：4共混制备WF/PP复合材料。研究了复合材料的吸水率和抗尼日尔曲霉霉菌能力。结果表明，硅烷能改善WF与PP之间的界面粘结。经4%硅烷处理的WF/PP复合材料的吸水率比对照降低了6%，平均霉菌生长等级从4级（霉菌覆盖率为75-100%）降低到1级（霉菌覆盖率为0-25%）。蜡的强疏水性对复合材料的界面结合有负面影响。因此，用蜡和硅烷-蜡化合物改性的复合材料显示出比对照更高的吸水率。然而，在这些组中，复合材料的耐霉菌性得到改善。Polym.比较器：2017.© 2017塑料工程师协会
Wood plastic composites can absorb water in exterior applications due to the hygroscopicity of wood flour (WF). The cycle of adsorption and desorption process causes damage to the interfacial bonding between WF and polymer matrix, which benefits the fungal attack. In this study, WF was, respectively, immersed with silane, wax emulsion, and their compound systems for modification at different concentrations (1, 2, and 4%, respectively). Then, the modified WF was mixed with polypropylene (PP) to produce WF/PP composites at mass ratio of 6:4. The water absorption and mold susceptibility of the composites against Aspergillus niger were investigated. The results showed that silane can improve the interfacial adhesion between WF and PP. The water uptake of WF/PP composites treated with 4% silane decreased by 6% compared with the control, and the average mold growth rating decreased from level 4 (mold covering of 75–100%) to level 1 (mold covering of 0–25%). The strong hydrophobicity of wax had a negative effect on the interfacial adhesion of the composites. Thus, composites modified with wax and silane-wax compounds showed higher water uptake than the control. However, the mold resistance of composites was improved in these groups. POLYM. COMPOS., 2017. © 2017 Society of Plastics Engineers