Effects of Two Types of Clay on Physical and Mechanical Properties of Poly(lactic acid)/Wood Flour Composites at Various Wood Flour Contents
Effects of Two Types of Clay on Physical and Mechanical Properties of Poly(lactic acid)/Wood Flour Composites at Various Wood Flour Contents
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不同木粉含量下两种粘土对聚乳酸/木粉复合材料物理机械性能的影响
DOI：
10.1002/app.37797
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发表时间：
2013-02-15
影响因子：
3
通讯作者：
Wang, Xing
中科院分区：
文献类型：
--
作者：
Liu, Ru;Cao, Jinzhen;Wang, Xing
研究了钠基蒙脱土（Na-MMT）和有机蒙脱土（OMMT）两种粘土对聚乙烯（PP）本文研究了聚乳酸（PLA）/木粉（WF）复合材料的吸水率、吸水厚度膨胀率、弯曲断裂模量（莫尔）和弹性模量（MoE）等物理力学性能。和60wt%进行了测试。结果表明：（1）随着WF含量的增加，复合材料的24 h吸水率和厚度膨胀率增加，弯曲莫尔强度和结晶度下降，而弯曲MoE随WF含量的增加而增加，当WF含量为60 wt %时，弯曲模量急剧下降;（2）Na型蒙脱土的加入使吸水率和厚度膨胀率在40wt%以下略有增加，而OMMT在WF含量较高时，厚度膨胀率降低（3）当WF含量低于40 wt %时，Na-MMT和OMMT均能提高PLA/WF复合材料的弯曲莫尔和MoE，且OMMT的提高效果比Na-MMT更明显。（4）XRD和FT-Raman分析表明，当WF含量较高（60wt%）时，粘土更多地附着在WF表面，而不是分散在PLA基体中;（5）SEM分析表明，当WF含量超过40wt%时，复合材料的界面结合力变差，而OMMT改性后，复合材料的界面结合力得到改善。(C)2012 Wiley Periodicals，Inc. J.应用聚合物sci. 127：2566 - 2573，2013
To investigate the effects of two types of clay, namely, Na-montmorillonite (Na-MMT) and organic-montmorillonite (OMMT), on poly(lactic acid) (PLA)/wood flour (WF) composites, some physical and mechanical properties including the water sorption, thickness swelling, flexural modulus of rupture (MOR), and modulus of elasticity (MOE) of PLA/WF composites at different WF contents of 0, 20, 40, and 60 wt% were tested in this study. The results showed that: (1) the 24 h water uptake and thickness swelling increased and the flexural MOR and crystallinity decreased with the increasing WF content, whereas the flexural MOE of the composites increased with WF content up to 40 wt% but decreased sharply at WF content of 60 wt%; (2) the addition of Na-MMT slightly increased the 24 h water uptake as well as the thickness swelling rate below 40 wt%, whereas OMMT reduced the thickness swelling at higher WF contents (40, 60 wt%) although it showed little effect on 24 h water uptake; (3) both Na-MMT and OMMT could improve the flexural MOR and MOE of PLA/WF composite at WF contents below 40 wt%, and OMMT resulted in more obvious improvement than Na-MMT. However, they both showed negative effect at WF content of 60 wt%; (4) XRD and FT-Raman analysis suggested that clays would be attached more on the surface of the WF rather than diffused in the PLA matrix at a higher WF content (60 wt%); (5) SEM analysis proved that the interfacial adhesion of PLA and WF became poorer at WF content above 40 wt%, whereas it could be improved by OMMT modified. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 127: 2566-2573, 2013