The Effect of Molecular Weight on the Structure and Properties of PAN Precursor

Xue, Likun; Wang, Cheng Guo; Yu, Mengru; Lin, Zhi Tao

doi:10.4028/www.scientific.net/amr.781-784.2609

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…Thus, the VHMW precursor requires a higher temperature for the oxidative reaction to initiate [13]. Similar results were found by Lin, et al [14].…”

Section: Thermal Oxidationsupporting

confidence: 85%

High performance carbon fibers from very high molecular weight polyacrylonitrile precursors

Morris

Weisenberger

Abdallah

et al. 2016

Carbon

106

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Carbon fibers are unique reinforcing agents for lightweight composite materials due to their outstanding mechanical properties and low density. Current technologies are capable of producing carbon fibers with 90-95% of the modulus of perfect graphite (~1025 GPa). However, these same carbon fibers possess less than 10% of the theoretical carbon fiber strength, estimated to be about 100 GPa. Traditionally, attempts to increase carbon fiber rigidity above a certain level results in lower breaking strength. Therefore, to develop advanced carbon fibers with both very high strength and modulus demands a new manufacturing methodology. Here, we report a method of manufacturing moderate strength, very high modulus carbon fibers from a very high molecular weight (VHMW) polyacrylonitrile (PAN) precursor without the use of nanomaterial additives such as nucleating or structure-templating agents, as have been used by others.

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“…Thus, the VHMW precursor requires a higher temperature for the oxidative reaction to initiate [13]. Similar results were found by Lin, et al [14].…”

Section: Thermal Oxidationsupporting

confidence: 85%

High performance carbon fibers from very high molecular weight polyacrylonitrile precursors

Morris

Weisenberger

Abdallah

et al. 2016

Carbon

106

View full text Add to dashboard Cite

show abstract

“…Despite the off-circular morphologies of the high-molecularweight PAN fibers, the tensile strength of the precursor and carbon fibers increased with higher molecular weight owing to the increased crystal size and orientation. This was confirmed multiple times by other researchers [33,34]. Although the high-molecular-weight polymer has excellent mechanical properties, the high molecular weight generally induces increased viscosity and subsequent off-circular cross-section.…”

Section: Pan Structure and Molecular Weightsupporting

confidence: 72%

Designing Materials and Processes for Strong Polyacrylonitrile Precursor Fibers

2021

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Although polyacrylonitrile (PAN)-based carbon fibers have been successfully commercialized owing to their excellent material properties, their actual mechanical performance is still much lower than the theoretical values. Meanwhile, there is a growing demand for the use of superior carbon fibers. As such, many studies have been conducted to improve the mechanical performance of carbon fibers. Among the various approaches, designing a strong precursor fiber with a well-developed microstructure and morphology can constitute the most effective strategy to achieve superior performance. In this review, the efforts used to modulate materials, processing, and additives to deliver strong precursor fibers were thoroughly investigated. Our work demonstrates that the design of materials and processes is a fruitful pathway for the enhancement of the mechanical performance of carbon fibers.

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“…Meanwhile, the dispersity ( Ð M ), M w / M n , typically ranges from 1.5 to 3.0 . Molecular weight and molecular weight distribution have been shown to influence the microstructure of resulting carbon fiber . Specifically, Lin et al and Tsai et al have shown that higher molecular weight leads to grooved surfaces and changes in the cross‐section of the fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Molecular weight and molecular weight distribution have been shown to influence the microstructure of resulting carbon fiber . Specifically, Lin et al and Tsai et al have shown that higher molecular weight leads to grooved surfaces and changes in the cross‐section of the fiber. Moreover, the high molecular weight fractions in uncontrolled free radical polymerizations tend to be insoluble and cause problems such as gelation during fiber spinning and filtration .…”

Section: Introductionmentioning

confidence: 99%

High molecular weight and low dispersity polyacrylonitrile by low temperature RAFT polymerization

Moskowitz

Abel

McCormick

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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High molecular weight polyacrylonitrile (PAN) with low dispersity has been successfully synthesized utilizing reversible addition‐fragmentation chain transfer (RAFT) polymerization. A comprehensive study was performed to understand the influence of reaction temperature, RAFT agent structure, and [M]0:[CTA]0[I]0 on the polymerization kinetics, molecular weight, and dispersity. Enhanced control is attributed to reduction of side reactions by conducting the polymerization at lower temperature, and optimizing the radical exchange between active and dormant states via appropriate selection of RAFT agent and initiator. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 553–562

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The Effect of Molecular Weight on the Structure and Properties of PAN Precursor

Cited by 8 publications

References 7 publications

High performance carbon fibers from very high molecular weight polyacrylonitrile precursors

High performance carbon fibers from very high molecular weight polyacrylonitrile precursors

Designing Materials and Processes for Strong Polyacrylonitrile Precursor Fibers

High molecular weight and low dispersity polyacrylonitrile by low temperature RAFT polymerization

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