Highly improved mechanical and dielectric properties of paper-based composites with polyimide chopped fiber functionalized by ethylenediamine

Xie, Fan; Zhang, Nan; Lu, Zhaoqing; Zhuo, Longhai; Yang, Bin; Song, Shunxi; Qin, Panliang; Wei, Ning

doi:10.1177/0954008318802946

Cited by 10 publications

(2 citation statements)

References 40 publications

(45 reference statements)

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“…Consequently, making PI fibers surface rich in functional groups is vital because the surface of PI fibers usually shows chemically inert and smooth. Compared with other surface‐modification methods, such as coupling agents, plasma, and radiation, surface grafting is a brightly prospected surface modification technique, which can introduce small molecules, polymer layers, and nanoparticles with specific functional groups on the fiber surface by unique chemical reactions, thus contributing to the multiple applications of PI fibers 25–27 …”

Section: Introductionmentioning

confidence: 99%

Preparation and Cr (VI) adsorption of functionalized polyimide fibers

Jia

Jiang

et al. 2022

J of Applied Polymer Sci

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In order to overcome the shortcomings of nanofiber membranes such as low mechanical properties and poor acid resistance, amino-rich functionalized polyimide (PI)-polyethyleneimine (PEI) fibers were successfully prepared in the study. The structure and morphology in each functionalization step were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), static contact angle, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The adsorption kinetics analysis showed that the adsorption process followed a pseudo-second-order model, and the adsorption isotherm could be described better by the Langmuir model indicating the adsorption process was mainly chemical and homogeneous monolayer adsorption. Furthermore, the maximum adsorption capacity based on the Langmuir model was about 50 mg g À1 , and the calculated thermodynamic parameters demonstrated an endothermic process. Meantime, the PEI-grafted PI fibers also exhibited good regeneration performance and stable tensile strength during recycling tests process. In the first 3 adsorption-desorption cycles, the removal efficiency and tensile strength of PI-PEI fibers could be maintained up to 60.44% and 89.29% of the initial adsorption, respectively. This work achieved the function of removing Cr (VI) by combining the excellent high temperature resistance, acid resistance, and mechanical properties of PI fibers.

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Section: Introductionmentioning

confidence: 99%

Preparation and Cr (VI) adsorption of functionalized polyimide fibers

Jia

Jiang

et al. 2022

J of Applied Polymer Sci

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“…Treatments based on alkaline solutions, such as KOH or NaOH can be used to join two layers of polyimide [27] or PI fibers with epoxy [28]. Finally, amine-based treatments can also improve the bonding of PI films or fibers with other polymers [29,30].…”

Section: Introductionmentioning

confidence: 99%

An Assessment of Surface Treatments for Adhesion of Polyimide Thin Films

et al. 2021

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Polyimide films are currently of great interest for the development of flexible electronics and sensors. In order to ensure a proper integration with other materials and PI itself, some sort of surface modification is required. In this work, microwave oxygen plasma, reactive ion etching oxygen plasma, combination of KOH and HCl solutions, and polyethylenimine solution were used as surface treatments of PI films. Treatments were compared to find the best method to promote the adhesion between two polyimide films. The first selection of the treatment conditions for each method was based on changes in the contact angle with deionized water. Afterward, further qualitative (scratch test) and a quantitative adhesion assessment (peel test) were performed. Both scratch test and peel strength indicated that oxygen plasma treatment using reactive ion etching equipment is the most promising approach for promoting the adhesion between polyimide films.

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High‐performance composite paper based on heterogeneous polyimide fibers with enhanced mechanical and dielectric properties

Qin,

Li,

Dong

et al. 2024

Polymer Engineering & Sci

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With the advancement and modernization of industrial technology, the demands placed on the comprehensive properties of high‐performance insulating paper by various industries have become increasingly stringent. Polyimide (PI) fiber‐based paper with exceptional heat resistance and electrical insulation capabilities can fulfill the requirements of high‐temperature‐resistant insulating materials in advanced industrial technology. However, the challenges in pulping and dispersing PI fibers have constrained the production of all PI‐based papers. In this study, feathered polyamide acid (PAA) fibrids with yarn‐splitting morphologies were firstly prepared through precipitation strategy under “high‐speed rotation‐shear” process, which were then wet‐formed with PI chopped fibers through papermaking process following with chemical imidization and hot‐pressing posttreatment. With the optimized components of PAA papers and imidization process, the mechanical properties of PI‐based paper could improve to 14 MPa, with a breakdown strength of 40 kV/mm. Furthermore, the obtained all‐PI composite paper demonstrated excellent resistance to aging with dielectric properties remaining relatively stable after a specified aging period, exhibits outstanding overall performance and broad application prospects in the field of electrical insulation.Highlights Feathered polyamide fibrids were prepared via high‐speed shear precipitation. The components and imidization process of composite papers were optimized. The paper showed tensile strength of 14 MPa and breakdown strength of 40 kV/mm. The paper demonstrated excellent resistance to oil aging with good properties.

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Highly improved mechanical and dielectric properties of paper-based composites with polyimide chopped fiber functionalized by ethylenediamine

Cited by 10 publications

References 40 publications

Preparation and Cr (VI) adsorption of functionalized polyimide fibers

Preparation and Cr (VI) adsorption of functionalized polyimide fibers

An Assessment of Surface Treatments for Adhesion of Polyimide Thin Films

High‐performance composite paper based on heterogeneous polyimide fibers with enhanced mechanical and dielectric properties

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