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首页> 外文期刊>Journal of Applied Polymer Science >Fiber-Reinforced Cellulosic Thermoplastic Composites
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Fiber-Reinforced Cellulosic Thermoplastic Composites

机译：纤维增强纤维素热塑性复合材料

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Steam-exploded fibers from Yellos poplar (Liriodendron tulipifera) wood were assessed in terms of their thermal stability characteristics, their impact on torque during melt processing of a thermoplastic cellulose ester (plasticized CAB) matrix, their fiber-matrix adhesion and dispersion in composites, and their mechanical properties under tension. Fibers included water-extracted steam-exploded fibers (WEF), alkali extracted fibers (AEF), acetylated fibers (AAEF), and a commercial milled oat fiber sample (COF)(i.e., untreated control). The results indicate that the thermal stability of steam-exploded fibers increases progressively as the fibers are extracted with water and alkali and following acetylation. The greatest improvement resulted from the removal of water-soluble hemicelluloses. The modification by acetylation contributed to improved interfacial wetting that was revealed by increased touque during melt processing. Whereas modulus increased by between 0 and 100% with the incorporation of 40% fibers by weight, tensile strength eitehr declined by 1/3 to 1/2 or it increased by a maximum of 1-%, depending on fiber type. AAEF composites produced the best mechanical properties. Fiber-aspect ratio was reduced to an average of 25-50 from 200 during compounding. The superior reinforcing characteristics of AAEF fibers were also reflected by SEM, which revealed better fiber-matrix adhesion and failure by fiber fibrillation rather than by fiber pullout.
机译：对Yellos杨树（Liriodendron tulipifera）木材的蒸汽爆炸纤维进行了评估，包括其热稳定性，对热塑性纤维素酯（增塑的CAB）基体进行熔融加工时对扭矩的影响，其对纤维基质的粘附力以及在复合物中的分散性，以及它们在张力下的机械性能。纤维包括水提取的蒸汽爆炸纤维（WEF），碱提取纤维（AEF），乙酰化纤维（AAEF）和商业碾磨的燕麦纤维样品（COF）（即未经处理的对照）。结果表明，随着水和碱的提取以及乙酰化反应的进行，蒸汽爆破纤维的热稳定性逐渐提高。最大的改善来自去除水溶性半纤维素。通过乙酰化进行的改性有助于改善界面润湿性，这在熔体加工过程中通过增加的扭矩得以揭示。当掺入40％（重量）的纤维时，模量增加了0％至100％，而拉伸强度eitehr则下降了1/3至1/2，或者最多增加了1％，这取决于纤维的类型。 AAEF复合材料具有最佳的机械性能。在混合过程中，纤维纵横比从 200降低到平均25-50。 SEM也反映出AAEF纤维的优异增强特性，它显示出更好的纤维基质粘合性和纤维原纤化而不是纤维拔出引起的破坏。

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