环氧树脂
复合材料
天然橡胶
材料科学
脆性
粒子(生态学)
光学显微镜
断裂(地质)
聚合物
扫描电子显微镜
海洋学
地质学
作者
Maria Stratigaki,Christoph Baumann,Robert Göstl
出处
期刊:Macromolecules
[American Chemical Society]
日期:2022-01-27
卷期号:55 (3): 1060-1066
被引量:8
标识
DOI:10.1021/acs.macromol.1c02366
摘要
Brittle fracture often compromises the durability of glassy polymers. This can be mitigated by reinforcing the matrix with a filler, activating a range of toughening mechanisms. Therefore, it is desirable to better understand the mechanical response of polymer composites, but a direct visualization of the mechanical fate of second-phase inclusions upon material fracture was previously unavailable. Here, rubbery poly(hexyl acrylate) particles, cross-linked with an optical force probe (OFP), are dispersed within an epoxy matrix, the material is fractured, and particle–crack interactions are visualized with confocal laser scanning microscopy. The dual-fluorescence character of the OFPs allows the differentiation between particles that remain intact and those that are stressed beyond bond scission upon interaction with a propagating crack. The localized activation of OFPs reveals stress gradients within the particles and crack direction pathways, hence providing a new layer of information over fracture events in polymer composites.
科研通智能强力驱动
Strongly Powered by AbleSci AI