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首页> 外文期刊>Journal of Polymers and the Environment >Effect of Alkaline Treatment and Pre-impregnation on Mechanical and Water Absorbtion Properties of Pine Wood Flour Containing Poly (Lactic Acid) Based Green-Composites
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Effect of Alkaline Treatment and Pre-impregnation on Mechanical and Water Absorbtion Properties of Pine Wood Flour Containing Poly (Lactic Acid) Based Green-Composites

机译：碱处理和预浸渍对含聚乳酸基绿色复合材料的松木粉机械和吸水性能的影响

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摘要

The effect of surface treatments and wood flour (WF) ratio on the mechanical, morphological and water absorption properties of poly (lactic acid) (PLA) based green-composites were studied. WF/PLA interfacial adhesion was promoted by means of alkaline treatment and preimpregnation with dilute solution of matrix material. The composite materials were manufactured with twin screw extruder and injection molded samples were used for characterization. According to tensile test results, the inclusion of WF without any surface treatment caused high reduction at tensile strength in spite of incremental increase of modulus values. As the amount of alkaline treated WF increased, both modulus and tensile strength increased. Both alkaline treatment and pre-impregnation further increased the mechanical properties including tensile strength, tensile modulus and impact strength. Scanning electron microscopy (SEM) micrographs supported these findings. According to dynamic mechanical analysis (DMA) test results, the glass transition temperature of PLA increased with the addition of WF and the highest increment was obtained when preimpregnated WF was used. Although alkaline treatment had no effect on water up-take properties of composites, preimpregnation reduced the water uptake of the composite.
机译：研究了表面处理和木粉（WF）比例对基于聚乳酸（PLA）的绿色复合材料的机械，形态和吸水性能的影响。 WF / PLA界面粘合通过碱处理和基质材料的稀溶液预浸渍来促进。用双螺杆挤出机制造复合材料，并使用注塑样品进行表征。根据拉伸试验结果，尽管模量值逐渐增加，但未经任何表面处理的WF含量仍导致拉伸强度大大降低。随着碱处理的WF量的增加，模量和拉伸强度均增加。碱处理和预浸渍都进一步提高了机械性能，包括拉伸强度，拉伸模量和冲击强度。扫描电子显微镜（SEM）显微照片支持了这些发现。根据动态力学分析（DMA）测试结果，PLA的玻璃化转变温度随WF的增加而升高，并且当使用预浸渍的WF时获得了最高的增量。尽管碱处理对复合材料的吸水性能没有影响，但是预浸渍降低了复合材料的吸水率。

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