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首页> 外文期刊>Plant biology >A Comparison of Two Techniques for Wood Fibre Isolation-Evaluation by Tensile Tests on Single Fibres with Different Microfibril Angle
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A Comparison of Two Techniques for Wood Fibre Isolation-Evaluation by Tensile Tests on Single Fibres with Different Microfibril Angle

机译：两种不同微纤丝角单根纤维拉伸试验评估木纤维分离技术的比较

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摘要

Fibres (tracheids) of spruce (Picea abies [L.] Karst.) were isolated by means of two isolation techniques. On the one hand, a soft chemical treatment with Jeffrey solution was used. The isolation was carried out with a reduced time of treatment (2 h), just to achieve the state where the fibres could be separated easily with tweezers. On the other hand, fibres were directly peeled out with tweezers, taking advantage of the low shear strength between them. Following this approach, a chemical treatment could be avoided completely. In order to compare the isolation techniques, single tracheids from tissue types with different microfibril angle (earlywood, latewood, juvenile wood, opposite wood, compression wood) were tested in the dry state. The microfibril angles were determined by X-ray diffraction. Single tracheids handled with both isolation techniques were strained in microtensile tests and load-strain diagrams were obtained. The chemically treated fibres were found to have much lower strength and stiffness compared to the mechanically isolated fibres, even though the influence of microfibril angle was still obvious for both kinds of treatment. The results clearly show the importance of single fibre extraction to preserve as much as possible the original properties.
机译：通过两种分离技术分离云杉（Picea abies [L.] Karst。）的纤维（气管）。一方面，使用了用杰弗里溶液进行的软化学处理。分离是在减少的处理时间（2小时）下进行的，只是为了达到可以用镊子轻松分离纤维的状态。另一方面，利用镊子之间的低剪切强度，将纤维直接用镊子剥离。按照这种方法，可以完全避免化学处理。为了比较分离技术，在干燥状态下测试了来自具有不同微纤丝角度（早材，晚材，少年材，对生材，压材）的组织类型的单个气管。通过X射线衍射确定微原纤维角度。用两种隔离技术处理的单个气管在微拉伸试验中拉紧，并获得了载荷-应变图。与微机械分离的纤维相比，化学处理的纤维的强度和刚度要低得多，尽管在两种处理中微纤丝角的影响仍然很明显。结果清楚地表明了单纤维提取对保持尽可能多的原始特性的重要性。

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