Journal
POLYMER TESTING
Volume 115, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2022.107715
Keywords
Polymer -matrix composites; Fatigue; Mechanical properties; Microstructural analysis; Cure
Funding
- Major Scientific and Technological Innovation Project of Shandong Province [2021CXGC010901]
- Taishan Scholar Program
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This study investigates the relationship between crosslinking structure and mechanical properties, dynamic properties, and microstructural evolution before and after thermo-oxidative aging in unfilled NR/BR blends. The results show that the polysulfide bond content and density decrease with increased thermo-oxidative aging time and increase with TBIR content.
As the most popular rubber blends in rubber industry, the aging behaviors of NR/BR vulcanizates have been a major challenge in science and industry. Our previous work reported the substitution of trans-1,4-poly (isopreneco-butadiene) (TBIR) for BR in filled NR/BR vulcanizates for improved thermo-oxidative resistance. However, the effect of microstructure, especially the evolution of crosslinking networks structure on aging mechanism of unfilled NR/BR blends with extra TBIR has not been studied cleanly so far. Herein, the relationship between the crosslinking structure and mechanical or dynamic properties for unfilled NR/BR blends with extra TBIR are showed, and the microstructure evolution before and after thermo-oxidative aging also has been discussed. The evolution of crosslinking network, compatibility and phase morphology are systematically investigated. The results show that the polysulfide bond content and density decreased with the increased thermo-oxidative aging time and increased with the TBIR content. The increased polysulfide bonds give NR/BR/TBIR blends excellent fatigue properties. The chemical structure and thermo-oxidative aging mechanism of NR/BR/TBIR vulcanizates are also been discussed.
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