长径比对聚合物-黏土纳米复合材料阻隔性能的影响。

Influence of aspect ratio on barrier properties of polymer-clay nanocomposites.

作者信息

Lu Chunsheng, Mai Yiu-Wing

机构信息

Centre for Advanced Materials Technology, School of Aerospace, Mechanical, and Mechatronic Engineering J07, The University of Sydney, Sydney, NSW 2006, Australia.

出版信息

Phys Rev Lett. 2005 Aug 19;95(8):088303. doi: 10.1103/PhysRevLett.95.088303.

DOI:10.1103/PhysRevLett.95.088303

PMID:16196908

Abstract

The barrier properties of polymer-clay nanocomposites, with far less inorganic contents of layered-silicate fillers, are remarkably superior to those of neat polymers or their conventional counterparts. A simple renormalization group model is proposed to assess the influence of geometric factors (such as aspect ratio, orientation, and extent of exfoliation) of layered-silicate fillers on the barrier properties of polymer-clay nanocomposites. The results show that the aspect ratio of exfoliated silicate platelets has a critical role in controlling the microstructure of polymer-clay nanocomposites and their barrier properties. The estimated percolation thresholds of clay content for minimum permeability are in good agreement with experimental data.

摘要

聚合物-粘土纳米复合材料中，层状硅酸盐填料的无机含量远低于传统材料，但其阻隔性能却明显优于纯聚合物或其传统对应物。本文提出了一个简单的重整化群模型，以评估层状硅酸盐填料的几何因素（如长径比、取向和剥离程度）对聚合物-粘土纳米复合材料阻隔性能的影响。结果表明，剥离的硅酸盐片层的长径比在控制聚合物-粘土纳米复合材料的微观结构及其阻隔性能方面起着关键作用。估算的粘土含量最低渗透率的渗流阈值与实验数据吻合良好。