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首页> 外文期刊>Journal of Applied Polymer Science >Bleached extruder chemi-mechanical pulp fiber-PLA composites: Comparison of mechanical, thermal, and rheological properties with those of wood flour-PLA bio-composites
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Bleached extruder chemi-mechanical pulp fiber-PLA composites: Comparison of mechanical, thermal, and rheological properties with those of wood flour-PLA bio-composites

机译：漂白挤出机化学机械纸浆纤维-PLA复合材料：与木粉-PLA生物复合材料的机械，热学和流变性能的比较

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摘要

An environmentally friendly bleached extruder chemi-mechanical pulp fiber or wood flour was melt compounded with poly(lactic acid) (PLA) into a biocomposite and hot compression molded. The mechanical, thermal, and rheological properties were determined. The chemical composition, scanning electron microscopy, and Fourier transform infrared spectroscopy results showed that the hemicellulose in the pulp fiber raw material was almost completely removed after the pulp treatment. The mechanical tests indicated that the pulp fiber increased the tensile and flexural moduli and decreased the tensile, flexural, and impact strengths of the biocomposites. However, pulp fiber strongly reinforced the PLA matrix because the mechanical properties of pulp fiber-PLA composites (especially the tensile and flexural strengths) were better than those of wood flour-PLA composites. Differential scanning calorimetry analysis confirmed that both pulp fiber and wood flour accelerated the cold crystallization rate and increased the degree of crystallinity of PLA, and that this effect was greater with 40% pulp fiber. The addition of pulp fiber and wood flour modified the rheological behavior because the composite viscosity increased in the presence of fibers and decreased as the test frequency increased. (C) 2016 Wiley Periodicals, Inc.
机译：将环保型漂白挤出机化学机械浆粕纤维或木粉与聚乳酸（PLA）熔融混合，制成生物复合材料并热压成型。测定了机械，热和流变性能。化学成分，扫描电子显微镜和傅里叶变换红外光谱结果表明，纸浆纤维原料中的半纤维素在纸浆处理后几乎被完全除去。力学测试表明，纸浆纤维增加了生物复合材料的拉伸模量和挠曲模量，并降低了其拉伸，挠曲和冲击强度。但是，纸浆纤维强烈增强了PLA基体，因为纸浆纤维-PLA复合材料的机械性能（尤其是拉伸强度和弯曲强度）要优于木粉-PLA复合材料。差示扫描量热法分析证实，纸浆纤维和木粉均加速了冷结晶速率并提高了PLA的结晶度，并且对于40％的纸浆纤维，该效果更大。纸浆纤维和木粉的添加改变了流变性能，因为复合粘度在纤维存在下增加，并随着测试频率的增加而降低。 （C）2016威利期刊公司

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