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首页> 外文期刊>Journal of Polymers and the Environment >Effect of the Temperature and of the Drawing Conditions on the Fracture Behaviour of Thermoplastic Starch Films for Packaging Applications
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Effect of the Temperature and of the Drawing Conditions on the Fracture Behaviour of Thermoplastic Starch Films for Packaging Applications

机译：温度和拉伸条件对包装应用热塑性淀粉薄膜裂缝行为的影响

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摘要

In this work the effects of testing temperature and drawing orientation on the fracture behaviour of biobased and biodegradable thermoplastic starch based films, currently applied in the food packaging field, were investigated. At this aim, the Essential Work of Fracture (EWF) approach was applied on samples tested at 0 degrees C, 25 degrees C and 50 degrees C both in machine (MD) and in cross (CD) directions. The specific essential work of fracture (w(e)) values strongly decreased with the testing temperature, and w(e)values of CD samples were systematically higher than those of the corresponding MD samples. Considering that photograms of the CD samples taken during the EWF tests highlighted that the yielding zone became progressively opaque as an effect of the strain induced crystallization, it was hypothesized that in CD specimens part of the tensile energy applied during the straining process was utilized for the orientation of the macromolecules along the strain direction, rather than for the propagation of the crack in the ligament zone. Tensile tests under quasi-static conditions on dumbbell specimens highlighted that, regardless to the drawing direction, the stiffness and the resistance at yield and at break decreased with the temperature, while the strain at break was considerably enhanced. Moreover, because of the strong anisotropy induced by the molecular orientation in the drawing direction, MD tested samples had higher elastic modulus, yield resistance, and stress at break compared to CD samples.
机译：在这项工作中，研究了测试温度和绘图方向对目前施用于食品包装领域的生物化和可生物降解的热塑性淀粉基薄膜的断裂行为的影响。在此目的，骨折（EWF）方法的基本作品被应用于在机器（MD）和交叉（CD）方向上以0℃，25℃和50摄氏度的样品上进行测试。使用测试温度强烈降低的裂缝（W（e））值的具体基本作品，并且CD样品的W（E）值系统地高于相应的MD样品的W（E）值。考虑到在EWF试验期间采取的CD样品的摄影图突出显示，屈服区变得逐渐变现为应变诱导的结晶的效果，假设在CD标本中，在应变过程中施加的拉伸能量的一部分使用沿着应变方向的大分子取向，而不是用于韧带区域中的裂缝的传播。在哑铃样本上的准静态条件下的拉伸试验突出显示，无论拉伸方向如何，刚度和屈服性和断裂处的阻力随温度而降低，而断裂的菌株大大提高。此外，由于通过拉伸方向上的分子取向引起的强烈各向异性，与CD样品相比，MD测试样品具有更高的弹性模量，屈服性和断裂应力。

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