期刊
MATERIALS TODAY COMMUNICATIONS
卷 30, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2021.103077
关键词
Temperature resistance; Tribological properties; Polyimide; Polybenzimidazole; MD simulations
资金
- National Natural Science Foundation of China (NSFC) [52075247]
- NSFC-CASC [U2037603]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
The research focused on the thermal, mechanical and tribological performance of PBI/PI composites. Results showed that an increase in PBI content led to higher glass transition temperature, Young's modulus and shear modulus for PI, while decreasing the friction coefficient when sliding against copper.
Temperature resistance of polymer determined their service life as frictional materials. In order to improve the glass transition temperature (T-g), mechanical strength and wear resistance of polyimide (PI), the polybenzimidazole (PBI) with high temperature resistance was introduced for blends. However, research on the blending mechanism of PBI/PI composites were still not fully understood at the atomic level owing to the difficulty in situ experiments. Therefore, molecular dynamics simulation was employed to predict their thermal, mechanical and tribological performance of PBI/PI composites. Results indicated that the glass transition temperature, Young's modulus and shear modulus of PI increased with an increase of PBI contents, while the friction coefficient of PBI/PI composites sliding against copper decreased. 50%PBI/PI composite had the highest T-g of 575 K increased by 11.2%, Young's modulus of 8.64 GPa increased over three times and the smallest friction coefficient decreased from 0.16 to 0.11. The thermal expansion ratio of 50%PBI/PI composite also decreased compared to pure PI. The inherent mechanism was explored by analyzing the intermolecular forces. The fractional free volume (FFV) and mean square displacement (MSD) decreased after filling PBI because of strong adsorption effect between PI and PBI molecular, which restricted the movement of PI. Therefore, the thermal resistance and mechanical properties were improved after filling PBI.
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