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    High-Performance Degradable Poly(hexahydrotriazine)s and Their Potential for Tribological Applications

    Year: 2021

    Journal: ACS Appl. Polym. Mater., Volume 3, OCT 8, page 5257–5267

    Authors: Min, Chunying; Yang, Yuzi; Liang, Hongyu; He, Zengbao; Li, Qiuying; Zhu, Jinfeng; Zhang, Kan; Shi, Haiting; Wang, Wei

    Organizations: National Natural Science Foundation of China [51103065, 52075224]; Natural Science Foundation of Jiangsu Province [BK20191431]; Tribology Science Fund of State Key Laboratory of Tribology [SKLTKF17B08]; Project National United Engineering Laboratory for Advanced Bearing Tribology [201806]; Jiangsu Province [Surencaiban [2015] 26]

    Keywords: isomeric poly(hexahydrotriazine)s; synthesis; mechanical properties; tribological properties; degradation

    The isomeric poly(hexahydrotriazine)s (PHTs) were prepared, based on their hemiaminal dynamic covalent networks via a facile method at 50 degrees C, through 1,3-bis(4-aminophenoxy)-benzene (TPE-R) and 1,4-bis(4-aminophenoxy)benzene (TPE-Q) with formaldehyde. The influence of chain isomerism on thermal stability, mechanical properties, tribological properties, and the degradation rate of PHTs was investigated. The advantage of (TPE-Q)-PHTs compared with that of (TPE-R)PHTs is that they possessed a higher glass transition temperature (T-g) of 187 degrees C, a higher Yang's modulus of 10.7 GPa, and rapid degradation rate. Additionally, the (TPE-Q)-PHTs exhibited outstanding self-lubricating performance as compared to (TPE-Q)-PHTs because the para-connecting isomers showed lower surface energy, lower surface roughness, and higher hardness that effectively weakened the bonding force between friction pairs. Overall, the study of PHTs facilitates their practical application of energy conservation and environmental protection in the tribological industry.
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