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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >A PHYSICAL APPROACH IN THE UNDERSTANDING OF THE PHENOMENA ACCOMPANYING THE THERMAL TREATMENT OF LIGNIN
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A PHYSICAL APPROACH IN THE UNDERSTANDING OF THE PHENOMENA ACCOMPANYING THE THERMAL TREATMENT OF LIGNIN

机译：理解木质素热处理的现象的一种物理方法

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In this work, a mechanical approach is associated with the thermal behavior of lignin. Samples of lignin are submitted to a thermal treatment accomplished at different final temperatures of pyrolysis. The dimensional variations which occurred during the degradation of lignin are quantified by the Jacobian of the transformation. The increase of the Jacobian in the interval 180 to 260 degrees C signifies the formation and the development of a plastic phase by crazing as is indicated by scanning electron microscope micrographs of lignin residues. The apparition and the evolution of the plastic phase are not a new fact in fracture mechanics, but the characterisation of this phase and the mechanics of its formation and its fracture allow us to explain some aspects until now unknown in the thermal decomposition of lignin. The importance of this work relies on the analogy made between the thermal behaviour of lignin and the mechanical behaviour of polymers. This analogy permits us to make some interpretations and, for the first time, to explain the weak weight loss and the exothermic effect of the thermal degradation of lignin. (C) 1997 Elsevier Science B.V. [References: 19]
机译：在这项工作中，机械方法与木质素的热行为有关。木质素样品经受在不同的热解最终温度下完成的热处理。木质素降解过程中发生的尺寸变化通过转化的雅可比量化。木质素残留物的扫描电子显微镜照片表明，在180至260摄氏度的区间内，雅可比系数的增加表示通过裂纹形成和形成了塑性相。塑性相的出现和演化在断裂力学中并不是一个新的事实，但是该相的表征及其形成和断裂的机理使我们能够解释木质素的热分解至今尚不了解的某些方面。这项工作的重要性取决于木质素的热行为与聚合物的机械行为之间的类比。这种类比允许我们做出一些解释，并且首次解释木质素的热降解产生的微弱的重量减轻和放热效应。 （C）1997 Elsevier Science B.V. [参考：19]

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