Carbonfasern: Präkursor‐Systeme, Verarbeitung, Struktur und Eigenschaften

Frank, Erik; Steudle, Lisa M.; Ingildeev, Denis; Spörl, Johanna M.; Buchmeiser, Michael R.

doi:10.1002/ange.201306129

Cited by 33 publications

(22 citation statements)

References 268 publications

(159 reference statements)

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“…Carbon fibers (CFs) gain increasing importance in the area of lightweight construction. Despite their most favorable properties in terms of tensile strength and elastic modulus, costs of production are still too high to allow for their (almost) unlimited use . This is why the use of carbon composites is still restricted to high‐end applications, whether in aerospace or in the automotive sector.…”

Section: Introductionmentioning

confidence: 99%

Carbon Fibers Prepared from Melt Spun Peracylated Softwood Lignin: an Integrated Approach

Steudle

Frank

Ota

et al. 2017

Macro Materials & Eng

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Different softwood lignin O‐acyl derivatives, i.e., methacrylated, hexanoylated, benzoylated, methoxybenzoylated, and cinnamoylated lignin are synthesized and subjected to melt spinning. In the presence of spinning aids such as vanillin and ethylene glycol dimethacrylate, multifilament melt spinning is accomplished with spinning speeds up to 500 m min−1, which allowed for realizing uniform precursor fibers 17 μm in diameter. Out of all acyl‐derivatives of softwood lignin investigated, cinnamoylated softwood lignin (CL) turned out to be superior in terms of processability. CL‐derived precursor fibers are oxidatively thermostabilized and then carbonized applying carbonization temperatures up to 2200 °C. Carbon fiber structure formation is followed in detail by wide‐angle X‐ray scattering and Raman spectroscopy. An orientation ≤53% and a d 002 spacing of 0.353 nm is achieved. According to small angle X‐ray scattering, carbon fibers have a porosity of ≈38%. CL‐derived carbon fibers are also characterized in terms of mechanical properties. Tensile strengths up to 0.93 GPa (average 0.75 GPa) are obtained and follow Weibull statistics. Elastic moduli are ≤66.5 GPa (average 41.1 GPa).

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Section: Introductionmentioning

confidence: 99%

Carbon Fibers Prepared from Melt Spun Peracylated Softwood Lignin: an Integrated Approach

Steudle

Frank

Ota

et al. 2017

Macro Materials & Eng

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“…Thermal recycling of CFRP is defined by the decomposition of the polymer matrix at elevated temperatures. This decomposition is a thermal process that occurs by heat supply in an inert atmosphere (pyrolysis), with oxygen as a reaction partner (autothermal gasification for substoichiometric oxygen concentrations and (Frank et al, 2014), modified.…”

Section: Recyclingmentioning

confidence: 99%

Thermal treatment of carbon fibre reinforced polymers (Part 1: Recycling)

2019

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The increasing use of carbon fibre reinforced polymers requires suitable disposing and recycling options, the latter being especially attractive due to the high production cost of the material. Reclaiming the fibres from their polymer matrix however is not without challenges. Pyrolysis leads to a decay of the polymer matrix but may also leave solid carbon residues on the fibre. These residues prevent fibre sizing and thereby reuse in new materials. In state of the art, these residues are removed via thermal treatment in oxygen containing atmospheres. This however may damage the fibre's tensile strength. Within the scope of this work, carbon dioxide and water vapour were used to remove the carbon residues. This aims to eliminate or at least minimize fibre damage. Improved quality of reclaimed fibres can make fibre reuse more desirable by enabling the production of high-quality recycling products. Still, even under ideal recycling conditions the fibres will shorten with every new life-cycle due to production-based blending. Fibre disposal pathways will therefore always also be necessary. The problems of thermal fibre disintegration are summarized in the second part of this article (Part 2: Energy recovery).

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“…However,o ne of the main problemsa ssociated with graphite is its low energyd ensity,w ith its theoretical capacity of just 372 mAh g À1 .F or this reason, many studies have been focused on finding new carbon-based materials for use as anodesi n LIBs. [23][24][25][26][27][28][29] Lignin is the most abundant aromatic biopolymer on the planet. [12][13][14][15][16][17][18] However,t heir high cost and limitedp roduction throughput make their integration into industrial production difficult compared with traditional graphite.…”

Section: Introductionmentioning

confidence: 99%

“…[22] Lignin is considered av iable sustainable alternative to PANa sac arbon fibre precursor. [23][24][25][26][27][28][29] Lignin is the most abundant aromatic biopolymer on the planet. It is amorphous andi sp resenti nt he cell wall of plants.…”

Section: Introductionmentioning

confidence: 99%