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基于粘土的聚合物纳米复合材料：断裂的基本功

Clay-Based Polymer Nanocomposites: Essential Work of Fracture.

作者信息

Franco-Urquiza Edgar Adrian

机构信息

National Council for Science and Technology (CONACYT-CIDESI), Center for Engineering and Industrial Development, Carretera Estatal 200, km 23, Querétaro 76265, Mexico.

出版信息

Polymers (Basel). 2021 Jul 22;13(15):2399. doi: 10.3390/polym13152399.

DOI:10.3390/polym13152399
PMID:34372002
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8348371/
Abstract

This work details the general structure of the clays used as a reinforcement phase in polymer nanocomposites. Clays are formed by the molecular arrangement of atomic planes described through diagrams to improve their visualization. The molecular knowledge of clays can facilitate the selection of the polymer matrix and achieve a suitable process to obtain clay-based polymer nanocomposite systems. This work highlights the development of polymer nanocomposites using the melt intercalation method. The essential work of fracture (EWF) technique has been used to characterize the fracture behavior of materials that show ductility and where complete yielding of the ligament region occurs before the crack propagation. In this sense, the EWF technique characterizes the post-yielding fracture mechanics, determining two parameters: the specific essential work of fracture (), related to the surface where the actual fracture process occurs, and the specific non-essential work of fracture (), related to the plastic work carried out in the outer zone of the fracture zone. The EWF technique has been used successfully in nano-reinforced polymers to study the influence of different variables on fracture behavior. In this work, the fundamentals of the EWF technique are described, and some examples of its application are compiled, presenting a summary of the most relevant contributions in recent years.

摘要

这项工作详细介绍了用作聚合物纳米复合材料增强相的粘土的一般结构。粘土是由通过图表描述的原子平面的分子排列形成的，以提高其可视化程度。对粘土的分子了解有助于选择聚合物基体，并实现获得粘土基聚合物纳米复合材料体系的合适工艺。这项工作重点介绍了使用熔体插层法开发聚合物纳米复合材料的情况。断裂能（EWF）技术已被用于表征具有延展性且在裂纹扩展之前韧带区域完全屈服的材料的断裂行为。从这个意义上说，EWF技术表征了屈服后断裂力学，确定了两个参数：与实际断裂过程发生的表面相关的比断裂能（），以及与断裂区外部区域进行的塑性功相关的比非必要断裂能（）。EWF技术已成功应用于纳米增强聚合物中，以研究不同变量对断裂行为的影响。在这项工作中，描述了EWF技术的基本原理，并汇编了一些其应用实例，总结了近年来最相关的贡献。

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