Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7889311 | Composites Part A: Applied Science and Manufacturing | 2018 | 26 Pages |
Abstract
Low axial compressive strength derived from weak lateral interaction of aramid fiber is one of the major obstacles for its engineering application. Introducing cross-linking is an effective method to improve the property. In this study, Poly-(benzimidazole-terephthalamide) (PABI) fiber was synthesized and prepared by wet-spinning, followed by heat-treating at different conditions for formation of cross-linking. During the process, trace amount of oxygen was introduced and it was confirmed that oxygen had great influence on the cross-linking reaction. The finding was characterized in detail. It is found that cross-linking of PABI can take place upon 330â¯Â°C and cross-linking site is located in phenyl on benzimidazole moieties because of its higher electron density. Trace amount of oxygen can significantly catalyze the cross-linking reaction and make cross-linking degree improve. Compressive strength increases by over 50% and interfacial shear strength is improved by nearly 28% after cross-linking on the basis of maintaining excellent mechanical properties.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yu Dai, Yihao Yuan, Longbo Luo, Xiangyang Liu,