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首页> 外文期刊>Journal of Applied Polymer Science >PLA/lignocellulosic fiber composites: Particle characteristics, interfacial adhesion, and failure mechanism
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PLA/lignocellulosic fiber composites: Particle characteristics, interfacial adhesion, and failure mechanism

机译：PLA /木质纤维素复合材料：颗粒特性，界面粘合和破坏机理

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Poly(lactic acid) (PLA) composites were prepared using six lignocellulosic fibers with widely varying particle characteristics. The composites were characterized by tensile testing, scanning electron (SEM), and polarization optical microscopy (POM). Micromechanical deformation processes during loading were followed by acoustic emission measurements. Interfacial adhesion was estimated by three independent methods. Contrary to most claims published in the literature, interfacial adhesion between PLA and natural fibers was found to be rather strong, a result confirmed by the quantitative estimation of adhesion strength, acoustic emission measurements, and SEM study. Strong interfacial adhesion results in weak dependence of the extent of reinforcement on the particle characteristics of the reinforcing fibers. Both acoustic emission measurements and microscopy indicated that the dominating micromechanical deformation process is the fracture of the fibers and close correlation was found between the initiation stress of fiber fracture, reinforcement, and the ultimate strength of the composites.
机译：使用六种具有广泛变化的颗粒特性的木质纤维素纤维制备了聚乳酸（PLA）复合材料。通过拉伸测试，扫描电子（SEM）和偏振光学显微镜（POM）对复合材料进行了表征。加载过程中的微机械变形过程之后，进行声发射测量。界面附着力通过三种独立的方法估算。与文献中发表的大多数主张相反，PLA和天然纤维之间的界面粘合力非常强，这一结果已通过对粘合强度的定量估计，声发射测量和SEM研究得到了证实。较强的界面粘合性导致增强程度对增强纤维颗粒特性的依赖性较弱。声发射测量和显微镜观察均表明，主要的微机械变形过程是纤维的断裂，并且在纤维断裂的起始应力，增强和复合材料的极限强度之间发现密切相关。

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