ACS Applied Polymer Materials
·
2021
·
IF 4.089
Chunying Min,Yuzi Yang,Hongyu Liang,Zengbao He,Qiuying Li,Jinfeng Zhu,Kan Zhang,Haiting Shi,Wei Wang
The isomeric poly(hexahydrotriazine)s (PHTs) were prepared, based on their hemiaminal dynamic covalent networks via a facile method at 50 °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 (Tg) of 187 °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.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 7
·1671-1677
·
IF 5
Yi Xu,Xinyue Sun,Keqi Zhu,Shumin Xu,Changhui Liu,Shenghua Xiong,Chao Li
Oily wastewater and oil spills pose a threat to the environment and human health, and absorbing these harmful organics through porous aerogel materials is an efficient method for oil/water separation. Herein, we design degradable, hydrophobic, and mechanical 4,4′-methylenedianiline polybenzoxazine/silicone-based polyhexahydrotriazine aerogels (BOZ/Si-PHT) for efficient oil/water separation. The BOZ/Si-PHT interpenetrating network (IPN) aerogels were successfully prepared by sequential polymerization, followed by atmospheric drying without any additional post-processing. The as-prepared BOZ/Si-PHT aerogels exhibit prosperous hydrophobicity (a water contact angle of 121.5°) and good mechanical properties (a compressive strength of 449.6 kPa). Meanwhile, the BOZ/Si-PHT aerogels possess good absorption capacity of oils or organic solvents ranging from 4.6 to 16.3 times their own weights. More importantly, the BOZ/Si-PHT aerogels show rapid degradation after use. This work provides simple, environmentally friendly and sustainable materials for oil/water separation and the rationally designed hydrophobic BOZ/Si-PHT aerogels display enormous potential for practical applications dealing with oily wastewater and oil spills.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Y. Xu,Z. Li,X. Sun,K. Zhu,N. Yang,Y. Liu,Q. He,C. Li
Benzoxazine resins are widely used as matrix resins of composites in the aerospace industry. For example, auxiliary power units and center bodies of an aircraft are usually made by polybenzoxazine composites, and these parts should be replaced periodically for aviation safety. So, resins used in this field would better be strong and economically maintainable. However, traditional polybenzoxazines, which are formed by irreversible crosslinked networks, show brittle and undegradable. These two disadvantages may not only cause component malfunction but also huge maintenance costs. Considering these two points above, we developed a new kind of resin by employing an interpenetrating polymer network (IPN) structure into polybenzoxazine. A series of IPNs were prepared using 3-phenyl-3,4-dihydro-2H-benzo[e][1,3]oxazine-6-carbaldehyde (HB) and poly-(hexahydrotriazine) (PHT), by thermal polymerization . Various proportions of these two monomers were studied and their mechanical, thermal, and degrade properties were characterized. Fourier transform infrared spectrometer (FTIR) proves that intermolecular H-bonds (OH⋯O) exist between PHB and PHT, which facilitate the formation of homogeneous phase in IPNs. Tension test results show that mechanical properties especially the toughness of these IPNs increase sharply. The minimums of tensile strength and breaking elongation we acquired are 94.29 MPa and 5.63%, respectively, which exhibit 180% and 250% higher than those of pure PHT. In addition, we find that when the molar ratio of PHB/PHT is 2.4, tensile strength of the polymer (PHB/PHT-2.4) exhibits a highest value of 122.75 Mpa, and breaking elongation reaches 9.60%. At the same time, it shows the highest glass transition temperature (T g ) of 211 °C by dynamic thermo-mechanical analysis (DMA), compared with PHT and IPNs of the other proportions. Additionally, PHB/PHT IPNs exhibit a good solution degradability, when immersed for 36 h in a mixed solution, which was prepared by hydrochloric acid/tetrahydrofuran (1:4) mixed solvent. IPNs prepared by PHB/PHT could be totally broken in the solution above, except for PHB/PHT-4.8.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Xiaoqian Li,Xiaohua Jia,Xisheng Sun,Jin Yang,Yong Li,Sizhe Wang,Dan Shao,Lei Feng,Haojie Song
Inspired by the living tissues self-healing strategy, polyethylene wax (PEW) as a healing agent was embedded into poly(hexahydrotriazine)s (PHT) cross-linked networks by a simple in-suit polymerization reaction to obtain a self-healing carbon fiber reinforced polymer composite (CFRPs). The resultant CFRPs exhibited outstanding wear resistance with a minimum friction coefficient of 0.10 and acquired a high tensile strength of 287 MPa. In addition, the wear scar could readily heal after heating at over 100 °C for 60 s, and the friction coefficient stabilized around 0.12 after three-cycle tribological tests, which was owing to the formation of the protective layer by the low-melting-point PEW thermal migration to the wear track. This work opens up a new opportunity for fabricating self-healing CFRPs with durability and recyclability .
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Xiaoqian Li,Xiaohua Jia,Haojie Song,Hao Chen,Shaojie Sun
Growing carbon nanotubes (CNT) on the carbon fiber (CF) surface resolves the issue of insufficient strong interfacial bonding between CF and depolymerizable poly(hexahydrotriazine) (PHT). The unique one-dimensional structure of CNT is embedded as interlaminar reinforcement in PHT to create an effective mechanical interlock with the PHT matrix. This method significantly enhances the toughness and tensile strength of the composites, reaching 208.7 MPa. Tribological tests show that CNT with high specific surface area and typical graphitic structures enhance the tribological performance of composites. Compared to PHT/CF composites, PHT/CNT@CF composites were given an average friction coefficient that decreased to 0.15. Therefore, the CNT was cultivated to prepare high-performance PHT/CNT@CF composites, which constituting an efficient approach and holding significant potential for applications within the realm of tribology. Highlights Uniform carbon nanotubes (CNT) on carbon fiber (CF) can improve interfacial bonding with poly(hexahydrotriazine) (PHT). PHT/CNT@CF composites showed excellent mechanical and tribological properties. Growth of carbon nanotubes offers an ideal route to high-performance composites.
研究领域:
材料科学
·
力学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Xiaoqian Li,Xiaohua Jia,Jin Yang,Yong Li,Hongliang Lin,Haojie Song
Existing research on interfacial interactions of recyclable carbon fiber reinforced poly(hexahydrotriazine) (PHT) composites has mainly focused on the study of reinforcing fibers, ignoring the wide range of applications of matrix in advanced friction materials. Herein, polyhedral ZIF-8 was grown in-situ on the GO surface (named as ZIF-8@GO) to improve the load-bearing capacity of GO nanosheets. The ZIF-8@GO with zinc ions and imidazole ions were embedded as interlaminar reinforcement into matrix to construct a non-covalent cation-π interaction with indole-based PHT (In-PHT) matrix, which significantly enhanced the toughness and tensile strength (reached 215.5 MPa) of composites. With the incorporation of armor-shaped ZIF-8@GO reinforcement, compared with the composite without ZIF-8@GO, the wear track width was significantly decreased by 50%. Moreover, the worn surface lubricated by this composite exhibited efficient self-healing property due to the introduction of the polyethylene wax (PEW), and the healed average friction coefficient showed slight changes. Extensive analyses verify that the ZIF-8@GO structure and cation-π interactions across multiscale interfaces can enhance both mechanical strength and wear resistance of recyclable carbon fiber reinforced In-PHT composites (In-PHT-CFRPs). Highlights ZIF-8@GO was embedded as interlayer reinforcement to improve wear resistance. Cation-π interaction across interface enhances interface carrying capacity. Due to strong cation-π bonding, IPEZGC exhibits outstanding tensile strength. PEW was embedded as healing agent to obtain self-healing property.
研究领域:
材料科学
·
界面化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 17
·7469-7476
·
IF 4.5
Wang Lun,Li Wa,Yuan Rui,Huang Ying,Yin Qiang,Jiang Diwen,Chang Guanjun,Yang Li
The design of materials that can simulate the magical and complex phenomena in nature through simple theoretical and process design are essential and challenging. Here we describe a tough polyhexahydrotriazine film actuator bent in response to dichloromethane through simple theory and technological design, and its curving behavior is consistent with the snapping of a Venus flytrap. Theoretical calculation demonstrates that the driving force of the actuator derives from the C–H/ π interaction and halogen bond interaction between dichloromethane and polymer chains. Driven by two supramolecular interactions, the actuator bends and accumulates elastic potential energy, releasing elastic potential energy through snapping deformation, which can lift objects 20 times heavier than itself. Over time, the actuator remains bent, and the degree of bending increases, allowing it to wrap tightly around the object, with potential applications in protective materials and intelligent crawling systems. In addition, the actuator possesses good mechanical properties, solvent resistance, and thermal properties, with the ability to resist extreme conditions.
研究领域:
材料科学
·
仿生学
·
高分子化学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Chunying Min,Yaxiang Su,Hang Yu,Hongyu Liang
Developing sustainable thermosetting resins and their composite materials is one of the key research topics in the field of sustainable tribology today. This study prepared a series of polyhexahydrotriazine-crosslinked polyimide (PI-PHT) films featuring rigid skeleton-dynamic networks through polycondensation of amine-terminated polyimide oligomers with formaldehyde. The PI-PHT/250 °C film demonstrated outstanding tribological performance in various complex friction environments owing to its highly crosslinked rigid-flexible network, exhibiting a specific wear rate 55 % lower than conventional thermosetting polyimides (TBPI). Crucially, these high-performance films achieve complete degradation and recycling under acidic conditions (pH < 2, 25 °C). PI-PHT films and their composites uniquely combine exceptional wear resistance with recyclability, presenting significant application potential in sustainable tribology.
研究领域:
材料科学
·
高分子科学
·
摩擦学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）