Xianyu Sun

Beijing University of Chemical Technology

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Dezhen Wu

Beijing University of Chemical Technology

Hongqing Niu

Beijing University of Chemical Technology

Jinxiu Chen

Northwestern Polytechnical University

Qi Wang

Wenzhou Medical University

Xiaodong Wang

Université Laval

Yuyang Deng

China Tobacco

Shiqin Xu

Nanjing Maternity and Child Health Care Hospital

Tao Cai

University of South China

Jiang Du

Tongji University

Chuanzhi Pu

Beijing University of Chemical Technology

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Beijing University of Chemical Technology

Materials Science & Engineering

Chinese Academy of Sciences

Ministry of Education of the People's Republic of China

Wuhan University

Hunan University

Chongqing University

Northwestern Polytechnical University

University of Chinese Academy of Sciences

Nanjing Maternity and Child Health Care Hospital

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Surface chitosan-grafting modification of polyimide fibers for cobalt ion adsorption

Colloids and Surfaces A Physicochemical and Engineering Aspects (2024)

Xianyu Sun Qi Wang Jinxiu Chen Yuyang Deng Xiaodong Wang

Surface Modification

Chemical modification

10.1016/j.colsurfa.2024.133935

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Citations (4)

Aminobenzo-15-crown-grafted polyimide fibers for high-efficient and selective recovery of lithium from recycled Li-ion batteries

Separation and Purification Technology (2025)

Xianyu Sun Shiqin Xu Yu Jin Tao Cai Xiaodong Wang

10.1016/j.seppur.2025.131991

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Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers

Polymers (2023)

Jiang Du Chuanzhi Pu Xianyu Sun Qi Wang Hongqing Niu

Developing polyimide (PI) fibers with excellent interfacial adhesion and high mechanical properties for the PI fiber-reinforced polymer matrix composites (PFRPs) industry has been challenging. In this work, 4,4′-diamino-(1,1′-biphenyl)-3,3′-diol (HAB) diamine was introduced into the rigid molecular chains, and the high-performance PI fibers, presenting an interfacial shear strength (IFSS) value of 46.33 MPa, tensile strength of 2.62 GPa, and modulus of 100.15 GPa, were successfully manufactured when the content of HAB in mixed diamines was 30 mol %. Fourier transform infrared (FTIR) spectroscopy identified the presence of intermolecular H-bonding interactions, and 2D small-angle X-ray scattering indicated that the introduction of HAB moiety contributed to reducing the radii of microvoids in the fibers, which were considered to be the key factors leading to a significant enhancement in the mechanical properties of the fibers. X-ray photoelectron spectroscopy (XPS) and the static contact angle intuitively illustrated that the synthetic fiber surface contained active hydroxyl groups. The IFSS value of PI fiber/epoxy resin composites (PI/EPs) was 56.47 MPa when the content of HAB reached 70 mol %. Failure morphologies confirmed that the interfacial adhesion of PI/EPs was enhanced owing to the surface activity of PI fibers. Consequently, this study provides an effective strategy to the long-standing problems of high mechanical performances and poor surface activity for traditional PI fibers used in the PFRPs industry.

10.3390/polym15041032

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Surface Chitosan-Grafting Modification of Polyimide Fibers for Cobalt Ion Adsorption

Xianyu Sun Qi Wang Jinxiu Chen Yuyang Deng Xiaodong Wang

Chitosan (CTS) is widely used to treat wastewater's heavy metal and organic matter pollution. When used as an adsorbent, it can be prepared into different forms, such as microspheres, gels, and fibers. However, CTS has certain drawbacks, including a propensity to swell, low acid resistance, and poor mechanical characteristics. Polyimide (PI) has good acid resistance and recyclability. This study focused on the surface CTS-grafting modification of PI fibers for cobalt ion adsorption. The morphological changes of the resultant CTS-grafted PI fibers (PI‒CTS fibers) during functionalization were investigated by scanning electron microscopy and atomic force microscopy, and their structural and chemical changes were characterized by using X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and static contact angle measurement. The PI‒CTS fibers could fit the Langmuir isotherm model to yield a maximum adsorption capacity of 46.04 mg g-1, and its thermodynamic fitting indicated that the adsorption process was a heat-absorbing reaction. The PI‒CTS fibers demonstrated good cycling performance and stable tensile strength in the adsorption-desorption cycling experiments. In the third cycle experiment, the PI‒CTS fibers maintained an adsorption rate of 89.13% and tensile strength of 89.14%. Through grafting CTS onto the PI fibers, the low acid resistance of CTS was significantly enhanced. The PI‒CTS fibers could also be recycled, generating a novel notion for cobalt recycling.

Surface Modification

10.2139/ssrn.4720275

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Citations (1)