Characterization of organo-montmorillonite (OMMT) modified wood flour and properties of its composites with poly(lactic acid)

Characterization of organo-montmorillonite (OMMT) modified wood flour and properties of its composites with poly(lactic acid)
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有机蒙脱石(OMMT)改性木粉的表征及其与聚乳酸复合材料的性能

DOI:
10.1016/j.compositesa.2013.03.019
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发表时间:
2013-08
期刊:
Composites Part A: Applied Science and Manufacturing
影响因子:
--
通讯作者:
Yao Peng
Yao Peng
中科院分区:
其他
文献类型:
--
作者:
Ru Liu;Shupin Luo;Jinzhen Cao;Yao Peng

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在这项研究中,使用四种不同浓度(0.5%、1.0%、2.0%和4.0%)的钠蒙脱石(Na-MMT)和二癸基二甲基氯化铵(DDAC)通过两步过程对木粉(WF)进行改性,在WF内部形成有机蒙脱石(OMMT)。然后将三种尺寸的WF与聚乳酸(PLA)混合以生产WF/PLA复合材料。对处理后的 WF 进行了表征,并测试了复合材料的一些物理和机械性能。结果表明:(1)Na-MMT成功转化为OMMT并均匀分布在WF内部; (2)当MMT浓度为0.5%时,复合材料的拒水性、弯曲性能和拉伸性能均显着提高。然而,引入更多的OMMT后,由于OMMT团聚导致界面粘附力较差,增强效果减弱; (3) 具有最大WF尺寸的复合材料表现出最显着的改进,表明较大的WF更适合这种改性过程。
In this research, sodium-montmorillonite (Na-MMT) at four different concentrations (0.5%, 1.0%, 2.0% and 4.0%) and didecyl dimethyl ammonium chloride (DDAC) were used to modify wood flour (WF) in a two-step process to form organo-montmorillonite (OMMT) inside the WF. Then the WFs with three sizes were mixed with poly(lactic acid) (PLA) to produce WF/PLA composites. The treated WF was characterized and some physical and mechanical properties of the composites were tested. The results showed that: (1) Na-MMT was successfully transformed to OMMT and uniformly distributed inside WF; (2) at 0.5% MMT concentration, water repellency, flexural and tensile properties of the composites were improved significantly. However, after introducing more OMMT, the enhancements diminished because of poor interfacial adhesion caused by OMMT agglomeration; (3) the composites with the maximum size of WF showed the most significant improvements among all, suggesting bigger WF was more suitable for this modification process.
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