Surface-oxidized carbon fibers: IV. Interaction with high-temperature thermoplastics

Nitric acid oxidation of vapor grown carbon nanofibers

“…Similar deconvolution of the O1s spectra (see Table 6) gave four peaks, designated as peak I (at 531.0-531.9 eV, carbonyl oxygen of quinones) [25,29], peak II (at 532.3-532.8 eV, carbonyl oxygen atoms in esters, anhydrides and oxygen atoms in hydroxyl groups) d The increase in peak B and the absence of peak C may be an artifact of the deconvolution mathematics. Various peaks were seen in the O 1s XPS spectra suggesting that some functions belonging to peak C should be present.…”

“…Deconvolution of the C1s spectra of oxidized fibers gave three peaks designated as peak A (at 284.6 eV assigned to graphitic carbon) [20,[24][25][26][27][28], peak B (at 286.1-286.3 eV, carbon bonded to phenolic or alcoholic hydroxyls or ether oxygens) [20,[24][25][26][27][28] and peak C (at 287.1-288.9 eV, carbonyl carbon in ketones and quinones, carboxyl functions or ester groups) [24][25][26][27][28]. Peaks A and B were observed but only a very small peak C for the unoxidized fibers.…”

“…e Peak IV (at 534.3-535.4 eV, with peak maximum at 535.0 eV, oxygen atoms in carboxyl groups). [25,29], peak III (at 533.1-533.8 eV, the non-carbonyl (ether-type) oxygen atoms in esters and anhydrides) [25,29] and peak IV (at 534.3-535.4 eV, oxygen atoms in carboxyl groups) [25,29]. From these data, the relative distributions of the functional groups from the O 1s spectra were calculated and are shown in Table 6 for each sample.…”

“…Nitric acid oxidation, surprisingly, seems to have caused the loss of carboxylic acid functions (peak IV of O 1s spectra) present on the as-received fibers. Peak IV (-COOH oxygens, [25,29]) disappeared in the O 1s spectra. Carboxyl functions were present on the surface of the as-received fibers and were major contributors to their modest surface acidity.…”

Influence of Thermal Fiber Pretreatment on Microstructure and Mechanical Properties of C/C‐SiC with Thermoplastic Polymer‐Derived Matrices

“…[13][14][15] The adhesion of different polymers (thermoset and thermoplastic) to different pretreated carbon fibers and the influence on the interlaminar shear strength (ILSS) is shown elsewhere. [14,18,19] They found that XPS is a surface selective method to determine the chemistry of carbon surfaces. The shear strength increases due to the formation of chemical bonds between carbon fiber surfaces and polymer matrices.…”