A model for toughening of semicrystalline polymers
A model for toughening of semicrystalline polymers
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DOI：
10.1021/ma0706935
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发表时间：
2007-06
期刊：
影响因子：
5.5
通讯作者：
and Laurent Corté;L. Leibler
中科院分区：
文献类型：
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作者：
and Laurent Corté;L. Leibler
在半结晶聚合物中分散颗粒可以导致显着的冲击强度改善，并开辟了通往超韧材料的有前途的路线。虽然该技术被广泛用于改性聚合物的性能，预测分散体产生韧性仍然是一个具有挑战性的问题。通过比较的特征长度和变形过程中所涉及的增韧，我们解释了为什么需要一个最小的矩阵约束或韧带厚度诱导韧性。我们的模型被用来解释实验数据，并显示这个关键的限制长度取决于材料的性能，温度和加工历史。最重要的是，它揭示了一个意想不到的颗粒尺寸效应。这些预测为增韧材料的设计提供了新的见解。该模型还为理解其他复杂系统（如复合材料或生物物质）的断裂力学提供了指导。
Dispersing particles within a semicrystalline polymer can result in remarkable impact strength improvement and opens promising routes toward super-tough materials. Although the technique is extensively employed to modify polymer properties, predicting which dispersions yield toughness remains a challenging issue. By comparing the characteristic lengths and deformation processes involved in toughening, we explain why a minimum matrix confinement or ligament thickness is required to induce ductility. Our model was used to interpret experimental data and show how this critical confinement length depends on material properties, temperature, and processing history. Most importantly, it reveals an unexpected particle size effect. The predictions provide fresh insight into the design of toughened materials. The model also provides guidance to understanding the fracture mechanics of other complex systems such as composites or biological matter.