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Lignin-based carbon fibers: Formation, modification and potential applications

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Green Energy & Environment 2022年第4期7卷 578-605页

作者： Shichao Wang Jixing Bai mugaanire tendo innocent Qianqian Wang Hengxue Xiang Jianguo Tang Meifang Zhu Institute of Hybrid Materials College of Materials Science and EngineeringQingdao UniversityQingdao266071China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

As an aromatic polymer in nature, lignin has recently attracted gross attention because of its advantages of high carbon content, low cost and bio-renewability. However, most lignin is directly burnt for power generation to satisfy the energy demand of the pulp mills. As a result, only a handful of isolated lignin is used as a raw material. Thus, increasing value addition on lignin to expand its scope of applications is currently a challenge demanding immediate attention. Many efforts have been made in the valorization of lignin, including the preparation of precursors for carbon fibers. However, its complex structure and diversity significantly restrict the spinnability of lignin. In this review, we provide elaborate knowledge on the preparation of lignin-based carbon fibers ranging from the relationships among chemical structures, formation conditions and properties of fibers, to their potential applications. Specifically, control procedures for different spinning methods of lignin, including melt spinning, solution spinning and electrospinning, together with stabilization and carbonization are deeply discussed to provide an overall understanding towards the formation of lignin-based carbon fibers. We also offer perspectives on the challenges and new directions for future development of lignin-based carbon fibers.

关键词： Lignin-based carbon fiber Melt spinning Solution spinning Electrospinning

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Effective antibacterial and phase change PEG/Cu2O@A-HNTs composites for melt-spun difunctional PA6 fiber

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Progress in Natural Science:Materials International 2022年第6期32卷 776-785页

作者： Mian Zhai Jialiang Zhou Zexu Hu mugaanire tendo innocent Ruixue Wang Chao Jia Hengxue Xiang Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Jiangsu Gem Advanced Fiber Materials Research Institute Co. Ltd

Serving as the only defensive line between pathogens and human body,personal protective equipment(PPE) is increasingly attractive among researchers because of their strong antibacterial and temperature control ***,efficient antibacterial properties and regenerative thermal control simultaneously remain unexplored in ***,one-dimensional halloysite nano tubes(HNTs) modified by acid etch method,are used to synthesis a multifunctional material of PEG/Cu2O@A-HNTs via in-situ reduction and physical adsorption which serves the above two ***/Cu2O@A-HNTs showed rapid bacterial inactivation and achieved 96.3% bacteriostatic rate against *** in only 20 *** a broad and complete inactivation spectrum included both *** and *** following a series of antibacterial ***,adsorption of 70 wt% PEG by acid etch HNTs is attributed to the nearly 3 times increased specific surface area compared with native *** enabled PEG/Cu2O@A-HNTs to attain a phase change enthalpy of 108.4 J/*** addition,using PEG/Cu2O@A-HNTs as additives,antibacterial and phase change fiber(APCF) were *** efficiency factor against *** and *** was above 99.99%,and retained a temperature control ability for 180s and 272s compared with PA6 fiber in hot and frigid environments respectively.

关键词： Antibacterial activity Halloysite nanotube Personal protective equipment Phase change material

Ultra-fast bacterial inactivation of Cu_(2)O@halloysite nanotubes hybrids with charge adsorption and physical piercing ability for medical protective fabrics

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Journal of Materials Science & Technology 2022年第27期122卷 1-9页

作者： Yaping Wang Qianqian Wang Guoyi Wu Hengxue Xiang mugaanire tendo innocent Mian Zhai Chao Jia Peng Zou Jialiang Zhou Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Shanghai Public Health Clinical Center Fudan UniversityShanghai 200540China

Metals have been used for wound treatment and toxicity testing since ancient *** the development of nanotechnology,metal oxides have been proven to have excellent sterilization and disinfection ***,the rapid bacterial inactivation efficiency and trapping physicochemical killing ability remain simultaneously undemonstrated in antibacterial ***,we demonstrate a method for in-situ reduction of small-sized Cu_(2)O particles on one-dimensional inorganic halloysite nanotubes(HNTs).The resultant Cu_(2)O@HNTs hybrids not only give Cu_(2)O excellent dispersibility,but also exert the synergistic effect of the charge adsorption of metal oxides and the physical piercing effect of the small-sized ***,the release of Cu^(2+)from hybrids damages cell membranes and denatures proteins and *** this sterilization mechanism,Cu_(2)O@HNTs allow for the inactivation rate of Escherichia coli to reach 94.5%within 2 min and complete inactivation within 10 *** excellent sterilization mode makes Cu_(2)O@HNTs exhibit excellent broad-spectrum antibacterial activity and inactivation efficiency,while shows weak *** hybrids were further applied in the processing of functional antibacterial fibers and ***,we believe that this excellent antibacterial hybrid is practically attractive in this critical time of the COVID-19 pandemic.

关键词： Cu_(2)O Halloysite nanotubes Antibacterial activity Efficient inactivation Protective fabrics

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Combustion forming hollow nanospheres as a ceramic fortress for flame-retardant fiber

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Progress in Natural Science:Materials International 2021年第2期31卷 239-247页

作者： Gongxun Zhai Jialiang Zhou Hengxue Xiang mugaanire tendo innocent Senlong Yu Weinan Pan Lili Li Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials International Joint Laboratory for Advanced Fiber and Low-dimension Materials College of Materials Science and Engineering Donghua University

Simple, effective and safe flame retardants are required to improve flame retardant properties of polymer ***, traditional additive flame retardants, such as halogen-flame retardants and intumescent flame retardants, are likely to cause phase separation of functional phases due to their poor dispersibility and compatibility, or are difficult to be suitable for the high temperature processing conditions of melt-spun fibers. Here, in an effort to develop a practical flame retardant system in which zinc diphosphinate（DEPZn） and D-glucose（DG）were selectively incorporated into polyethylene terephthalate（PET） fiber was developed. As a result, the dense nano-scale zinc phosphate microspheres were formed on the surface and inside the residual carbon during combustion. Thus, PET fibers were endowed with excellent flame retardancy through a thermal barrier and enhancement of physical strength for the carbon layer. Moreover, a synergistic flame-retardant effect was found between DEPZn and DG. DG reduced the size of the zinc phosphate nanosphere from 200 nm to 50 nm, making the carbon layer denser and smoother. As a result, the peak heat release of the resultant PET composite fiber decreased to 410 k W/m2compared 1276 k W/m2for neat PET fiber. Moreover, the total smoke release also dropped from 71 MJ/kg of neat PET fiber to 64 MJ/kg for PET composite fibers. These results provide a promising strategy for the production of industrialized PET flame retardant fibers.

关键词： Flame retardant fiber PET Zinc phosphate D -glucose Hollow nanospheres