Failure mechanism of glassy polymer-nanoparticle composites

被引：6
|
作者：
Lee, Jong-Young [1 ]
Zhang, Qingling [1 ]
Wang, Jia-Yu [1 ]
Emrick, Todd [1 ]
Crosby, Alfred J. [1 ]
机构：
[1] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
来源：
MACROMOLECULES | 2007年 / 40卷 / 17期
关键词：
D O I：
10.1021/ma0710479
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A model, well-dispersed nanocomposite of surface-modified cadmium selenide (CdSe) nanoparticles (average core diameter of 3.5 nm) blended into polystyrene is prepared such that entropic forces drive the failure mechanism of the nanocomposite. At an optimal volume fraction (similar to 0.7%) of nanoparticles, the failure strain of the nanocomposite is increased by nearly 60% relative to unfilled polystyrene. The proposed mechanism for this optimal volume fraction is related to the balance of two effects: (1) the decrease in the volume fraction of cross-tie fibrils and (2) the decrease in the extensibility of the craze. These results offer insight into an entropically driven failure of glassy polymer nanocomposites and help guide future design of nanoparticle-based composite materials.
引用
收藏
页码：6406 / 6412
页数：7
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