Ultra high density carbon fiber derived from isotactic polypropylene fiber without skin‐core structure

Yang, Minghang; Sun, Luzhen; Liu, Qiongxia; Deng, Yu; Liu, Cheng; Li, Nan; Xu, Jian; Chen, Yousi; Jian, Xigao

doi:10.1002/pat.6300

Cited by 2 publications

(1 citation statement)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carbon fiber is a high-performance fiber with carbon content exceeding 90% [1,2]. Due to its high strength, high modulus, and lightweight properties, it is widely used in aerospace, military, automotive, construction, and sports industries [3][4][5]. Carbon fiber can be divided into pitch-based carbon fiber, polyacrylonitrile-based (PAN) carbon fiber, and bio-based carbon fiber [6,7], with polyacrylonitrile-based carbon fiber currently holding the largest market share [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Polyacrylonitrile-Based Fibers during Thermal Pre-Oxidation

Sun,

Wang,

Wang

et al. 2024

J. Compos. Sci.

View full text Add to dashboard Cite

In this work, pre-oxidized polyacrylonitrile fibers are treated with ultrasonic etching and solution etching to produce ultra-thin sections. The evolution of the fibers’ microstructure in the pre-oxidation process is observed, and the transformation model of the microstructure of the pre-oxidized fibers is proposed. Scanning electron microscopy and high-resolution transmission electron microscopy were used to observe the microstructure changes of the fibers. Fourier transform infrared spectroscopy and X-ray diffraction were used to observe the chemical structure transformation and crystallization degree of the fibers in the pre-oxidation process. The results revealed that pre-oxidized fibers exhibited a smooth surface, while their interior consisted of fibrils. The longitudinal microfibrils were connected by the transverse microfibrils and amorphous regions. The fracture morphology of the fibers shifted from ductile to brittle, and the cross-section gradually became smoother. The linear molecular chain of PAN transformed into a ring structure as pre-oxidation progressed, subsequently leading to the cross-linking of this ring structure into an orderly trapezoidal configuration. The connection between the fibrils was enhanced, and the fiber structure became more compact and stable.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Polyacrylonitrile-Based Fibers during Thermal Pre-Oxidation

Sun,

Wang,

Wang

et al. 2024

J. Compos. Sci.

View full text Add to dashboard Cite

show abstract

A Novel, Dual-Initiator, Continuous-Suspension Grafting Strategy for the Preparation of PP-g-AA-MAH Fibers to Remove of Indigo from Wastewater

Xie,

Fang,

Lian

et al. 2024

Polymers

View full text Add to dashboard Cite

The indigo dye found in wastewater from printing and dyeing processes is potentially carcinogenic, teratogenic, and mutagenic, making it a serious threat to the health of animals, plants, and humans. Motivated by the growing need to remove indigo from wastewater, this study prepared novel fiber absorbents using melt-blow polypropylene (PP) melt as a matrix, as well as acrylic acid (AA) and maleic anhydride (MAH) as functional monomers. The modification conditions were studied to optimize the double-initiation, continuous-suspension grafting process, and then functional fibers were prepared by melt-blown spinning the modified PP. The results showed that the optimum modification conditions were as follows: a 3.5 wt% interfacial agent, 8 mg/L of dispersant, 80% monomer content, a 0.8 mass ratio of AA to MAH, a 1000 r/min stir speed, 3.5 wt% initiator DBPH grafting at 130 °C for 3 h, and 1 wt% initiator BPO grafting at 90 °C for 2 h. The highest grafting rate of the PP-g-AA-MAH was 31.2%, and the infrared spectrum and nuclear magnetic resonance spectroscopic analysis showed that AA and MAH were successfully grafted onto PP fiber. This modification strategy also made the fibers more hydrophilic. The adsorption capacity of the PP-g-AA-MAH fibers was highly dependent on pH, and the highest indigo adsorption capacity was 110.43 mg/g at pH 7. The fiber adsorption capacity for indigo increased rapidly before plateauing with increasing time or indigo concentration, and the experimental data were well described in a pseudo-second-order kinetic model and a Langmuir isothermal adsorption model. Most impressively, the modified fiber adsorption capacity for indigo remained as high as 91.22 mg/g after eight regeneration and reuse cycles. In summary, the PP-g-AA-MAH fibers, with excellent adsorption-desorption characteristics, could be readily regenerated and reused, and they are a promising material for the removal of indigo from wastewater.

show abstract

Ultra high density carbon fiber derived from isotactic polypropylene fiber without skin‐core structure

Cited by 2 publications

References 43 publications

Microstructure Evolution of Polyacrylonitrile-Based Fibers during Thermal Pre-Oxidation

Microstructure Evolution of Polyacrylonitrile-Based Fibers during Thermal Pre-Oxidation

A Novel, Dual-Initiator, Continuous-Suspension Grafting Strategy for the Preparation of PP-g-AA-MAH Fibers to Remove of Indigo from Wastewater

Contact Info

Product

Resources

About