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Long-term Thermo-oxidative Degradation Modeling of a Carbon Fiber Reinforced polyimide composite:Multistep Degradation Behaviors and Kinetics

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Chinese Journal of Polymer Science 2020年第11期38卷 1202-1213,I0007页

作者： Yi Liu Xiao-Zhou Xu Song Mo Bang-Wei Lan Cai-Zhen Zhu Cui-Hua Li Jian Xu Lin Fan Institute of Low-dimensional Materials Genome Initiative College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China Laboratory of Advanced Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

This study aims to disclose the thermo-oxidative degradation behaviors and kinetics of a carbon fiber reinforced polyimide(CFRPI)composite for modeling of the Iong-term degradation *** degradation behaviors were revealed through off-gas products analysis,and the overall kinetic interpretation was achieved from study of the mass-loss curves recorded under dynamic *** was found that thermooxidative degradati on of the CFRPI composite was a multistep process,which in eluded four main reaction *** most kinetic an alysis methods were derived from simple reactions described by a single kinetic triplet,they cannot be applied reliably to such a ***,we firstly separated the four overlapped reaction steps by peak fitting of derivative thermogravimetric curves using Fraser-Suzuki equation consider!ng the asymmetrical n ature of kin etic curves,and subsequently an a lyzed each in dividual reaction employing Friedma n method and experimental master-plots *** sets of kinetic triplets were determined to characterize the entire degradation *** validity of four corresponding kinetic triplets was confirmed by perfect simulation of mass-loss curves recorded at both dynamic conditions used in kinetic analysis and entirely different isothermal ***,modeling of Iong-term aging at 400°C of the CFRPI composite was successfully achieved based on these kinetic *** predicted mass loss and flexural property correlated well with experimental *** study can serve as a basis for rapid evaluation of the long-term durability of the CFRPI composite in various application environments.

关键词： polyimide composite Thermo-oxidative degradation Multistep process Kinetics Long-term aging modeling

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Tribological properties of polyimide composites reinforced with fibers rubbing against Al_(2)O_(3)

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Friction 2021年第2期9卷 301-314页

作者： Huimin QI Ga ZHANG Zhiqin ZHENG Jiaxin YU Chao HU Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education State Key Laboratory of Environment-friendly Energy MaterialsSouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Qingdao Center of Resource Chemistry&New Materials Qingdao 266071China Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory Southwest University of Science and TechnologyMianyang 621010China

Reinforcing fillers are of great importance in tribological performance and tribofilm formation of polymeric *** this study,the tribological properties of aramid particle(AP)and short carbon fiber(SCF)reinforced polyimide(PI)composites were added to hexagonal boron nitride(h-BN),and silica(SiO_(2))nanoparticles sliding against alumina were comprehensively *** sliding occurred with AP-reinforced PI composites,the tribological properties were not closely depended on the pressure×velocity(p×v)factors and the *** interactions between AP and its counterpart could not induce tribo-sintering of the transferred wear *** such,the tribofilm seemed to be in a viscous state,leading to higher friction and ***,the inclusion of hard SCF into the PI matrix changed the interfacial interactions with alumina.A robust tribofilm consisting of a high fraction of silica was generated when the SCF-reinforced PI was added to the SiO_(2) *** exhibited a high load-carrying capability and was easily *** caused a significant decrease in the friction and wear of the PI composite at 8 MPa·1m/***,due to their high melting point,few h-BN nanoparticles were observed in the tribofilm of the SCF-reinforced PI when hexagonal boron nitride was added.

关键词： reinforcing filler polyimide composite tribofilm Al_(2)O_(3)

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Comparative Study on Tribological Behavior of Graphene/polyimide and Carbon Fibers/polyimide composites: A Review

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World Journal of Engineering and Technology 2021年第1期9卷 26-50页

作者： Niyobuhungiro Daniel Hong Liu School of Mechanical Engineering Lanzhou Jiaotong University Lanzhou China

Recently, graphene and carbon fibers have enticed extensive consideration in many scientific fields, they are considered by many scientists to be one of the most promising materials in the 21st century. Due to the uniqueness of their properties was attracted to be used to reinforce polyimide. Impressive graphene properties coupled with those excellent of polyimide composites produced composites materials with good tribological properties, different contents of graphene and its derivatives tend to improve polyimide composites properties particularly friction and wear. Furthermore, nanofillers decorated graphene derivatives showed also an effect on the tribological properties of composites. Carbon fibers coupled with polyimide composites also reviewed and showed a significance in the improvement of the properties of composites materials. The results nanofillers reinforced carbon fibers/polyimide exhibit enhanced tribological properties, which can be applied in various fields. Therefore, this survey article gives an enormous review study of the tribological properties under various conditions of graphene/polyimide and car- bon fibers/polyimide composites. Besides the effects of nanofillers size on tribological properties, preparation, and research challenges were also reviewed.

关键词： Graphene Carbon Fiber polyimide composite Tribology

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Effect of surface modification on thermal expansion of Zr_(2)WP_(2)O_(12)/aromatic polyimides based composites

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Tungsten 2023年第1期5卷 179-188页

作者： Xin-Wei Shi Sen Zhang Qiang Zhou Jing Li Bai-Lin Zhu Liu-Jie Xu Qi-Long Gao School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Henan Key Laboratory of High-Temperature Structural and Functional Materials Henan University of Science and TechnologyLuoyang 471003China

Surface modification is a fascinating way to improve the compounding effect between inorganic fillers and *** this study,zirconium tungsten phosphate(ZWP) with negative thermal expansion was surface modified by silane coupling agent 3-(Trimethoxysilyl)propyl *** effects of surface modification and the modification mechanism were analyzed in detail by X-ray diffractometer,scanning electron microscopy,Fourier transform infrared spectroscopy and thermal mechanical *** surface modification could effectively reduce the thermal expansion properties of the *** the added amount of 3-methacryloxypropyl trimethoxysilaneSilane(trade name:KH570) is 0.50 wt%,the thermal expansion coefficient of ZWP/Aromatic polyimide composite decreased by 9.76%.The surface modification also can effectively improve the dielectric performance of aromatic *** present work provides one new way to improve the thermal expansion behavior of composites.

关键词： Negative thermal expansion Tungsten Surface modification polyimide composite Silane coupling agent

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