Influence of Oxygen Plasma Treatment of PAN-Based Carbon Fibers on Their Electrokinetic and Wetting Properties

Bismarck, Alexander; Kumru, Mert; Springer, Jürgen

doi:10.1006/jcis.1998.5912

Cited by 88 publications

(34 citation statements)

References 23 publications

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“…Besides the information that basic groups deteriorate and acidic groups enhance the wettability of pre-treated PAN-based carbon fibers [26,31] we did not find a clear report in the literature on the effect of neutral (quinonoid) groups on the wetting. In most cases there is not just one but a distribution of functional groups present at the surface and in addition there can be an influence of the surface morphology as well.…”

Section: Acid and Base Functional Groupsmentioning

confidence: 83%

Variability within a single type of polyacrylonitrile-based graphite felt after thermal treatment. Part II: chemical properties

Rabbow¹,

Trampert²,

Pokorný³

et al. 2015

Electrochimica Acta

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A B S T R A C T Graphite felts are often activated thermally before use in electrochemical reactors. This has the effect of improving wetting and decreasing charge-transfer resistance. In part I of this study, considerable variations were observed between two polyacrylonitrile (PAN)-based felts from different production charges after thermal activation, despite both charges being of the same type of felt from one supplier. A difference due to bulk crystallinity or due to pronounced core-rim structures of the fibres has been excluded. In this second part a limitation from tarry coatings, which are a possible side products of graphitization, could not be corroborated. However, differences were ascribed to variations in the surface chemistry, which was characterised by Boehm method titration and cyclic voltammetry. The composition of the oxides is discussed together with the possible role they play in the activation and wetting of the felts. The rather high amount of oxides suggests that the Boehm method measures subsurface groups in addition to surface groups. The wetting quality of activated felts can be correlated well with the concentration of neutral quinone groups, characterised by cyclic voltammetry.

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Section: Acid and Base Functional Groupsmentioning

confidence: 83%

Variability within a single type of polyacrylonitrile-based graphite felt after thermal treatment. Part II: chemical properties

Rabbow¹,

Trampert²,

Pokorný³

et al. 2015

Electrochimica Acta

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“…4). The f plateau for PA-12 is -25 mV, [29] the increase in f plateau of APO carbon fibres with increasing treatment time would suggest an increase in carbon/PA-12 adhesion strength [30]. The shift of the iep towards lower pH values indicates that APO carbon fibres have a more acidic character compared to the original fibres due to the presence of more acidic groups on the fibre surfaces (as discussed above).…”

Section: Discussionmentioning

confidence: 95%

“…Captured images were analysed using ImageJ (Wayne Rasband, NIH, USA) to measure the fragment lengths within the gauge length of SFC following the procedures described in Refs. [30,47]. The shear lag analysis approach proposed by Kelly and Tyson [48,49] was used to calculate the IFSS s between carbon fibres and PA-12:…”

Section: Effect Of Apo Treatment On Carbon Fibre/pa12 Adhesion: Singlmentioning

confidence: 99%

“…The fibre diameters and wettability of APO carbon fibres were determined using the modified Wilhelmy-technique [30]. The surface free energy of the treated fibres was determined from the contact angles measured using various test liquids.…”

Section: Fibre Surface Wettabilitymentioning

confidence: 99%

“…Interfacial adhesion between treated fibres and epoxy, determined by single fibre fragmentation tests, increased after OP treatment of carbon fibres. Bismarck et al [30,31] treated untreated, unsized carbon fibres in low pressure (LP) radio frequency (RF) OP and showed that the surface acidity and hydrophilicity of the fibres increased. However, single fibre fragmentation tests showed no enhancement in adhesion between OP treated carbon fibres and polycarbonate [31].…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Continuous Atmospheric Plasma Oxidation of Carbon Fibres: Influence on the Fibre Surface and Bulk Properties and Adhesion to Polyamide 12

Erden

Lamorinière

et al. 2010

Plasma Chem Plasma Process

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Continuous atmospheric plasma oxidation (APO) was used to introduce oxygen functionalities to the surface of carbon fibres in an attempt to enhance interfacial adhesion between carbon fibres and polyamide-12 (PA-12). APO only affects the surface properties of the fibres while their bulk properties remained unchanged. Contact angle and f-potential measurements demonstrated that APO-treated fibres became significantly more hydrophilic due to the introduction of polar oxygen-containing groups on the fibre surface, which also resulted in an increase of surface energy on the carbon fibres. The interfacial shear strength of single carbon fibre/PA-12 model composites, determined by single fibre fragmentation tests, showed an increase from 40 to 83 MPa with up to 4 min of APO treatment time which confirms that the fibre/matrix interfacial adhesion was enhanced. This highlights that the incorporation of APO into composite manufacturing will allow tailoring of the fibre/ matrix interface.

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Carbon Fiber: Surface Properties

Qian

Bismarck

2011

Wiley Encyclopedia of Composites

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Carbon fibers are the reinforcement of choice for high performance (advanced) composites. The fiber and matrix properties determine the various mechanical properties in and perpendicular to the fiber orientation in composites. However, for a given matrix the carbon fiber surface properties determine the quality of the fiber‐matrix interface, in which load transfer from the matrix to the fibers takes place. This article summarizes the surface properties of commercially available carbon fibers as well as the benefits of carbon fiber surface modification on the adhesion behavior between fibers and matrices.

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Influence of Oxygen Plasma Treatment of PAN-Based Carbon Fibers on Their Electrokinetic and Wetting Properties

Cited by 88 publications

References 23 publications

Variability within a single type of polyacrylonitrile-based graphite felt after thermal treatment. Part II: chemical properties

Variability within a single type of polyacrylonitrile-based graphite felt after thermal treatment. Part II: chemical properties

Continuous Atmospheric Plasma Oxidation of Carbon Fibres: Influence on the Fibre Surface and Bulk Properties and Adhesion to Polyamide 12

Carbon Fiber: Surface Properties

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