XPS/ISS Investigation of Carbon Fibers Sequentially Exposed to Nitric Acid and Sodium Hydroxide

Gardner, Steven D.; Singamsetty, Chakravarthy S. K.; Wu, Zhihong; Pittman, Charles U.

doi:10.1002/(sici)1096-9918(199605)24:5<311::aid-sia120>3.0.co;2-z

Cited by 39 publications

(5 citation statements)

References 37 publications

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“…This process is accompanied by a reduction in the carbon content from 80.3 to 73.5 at%, and C-C type bonds from 60.5 to 46.9 at%. The literature shows that such changes are typical during oxidation of carbon and lead to its chemical activation, stronger interfacial interactions and increased matrix adhesion [39,40].…”

Section: Samplementioning

confidence: 99%

Effect of various methods of pre-treatment of carbon fibers on the mechanical properties of PIP-based ceramics/carbon composites

Sokołowski

Pszczola

Błażewicz

et al. 2023

Preprint

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The purpose of this study was to establish the conditions of CF surface preparation suitable for obtaining composites with favorable mechanical properties. The relationships between the interfacial properties of the carbon fiber/polymethylsiloxane composites and mechanical properties of ceramic composites (CF/SiOC, CF/SiC) formed during heat-treatment (HT) up to 1700℃ were investigated. The CF-resin interfacial strength has been modified by fiber surface treatment including nitric acid oxidation, silanization, as well as by forming a coating on the CF surface by depositing CNT or a pyrolytic carbon layer (PyC). The study of composite interphases (Interlaminar Shear Strength, ILSS and SEM) and surface tests of the modified CF (XPS, FT-IR, wettability measurements) showed different nature of the bonding between CFs and the resin matrix before and after HT. The CF silanization promoting chemical interfacial interactions significantly improved the ILSS between CFs and resin by 38.5%, while reduced mechanical properties of resulting ceramic composites. The most promising surface treatment method of CF for PIP-based ceramic composites was modification with PyC layer, which provided 2 times higher ILSS, 1.5 times higher flexural strength and improved work to fracture (WF) as compared to unmodified CF.

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Section: Samplementioning

confidence: 99%

Effect of various methods of pre-treatment of carbon fibers on the mechanical properties of PIP-based ceramics/carbon composites

Sokołowski

Pszczola

Błażewicz

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…As a feasible pathway, the oxidation of nitric acid toward the as-received RCF can not only clean the RCF but can also activate its surface. 35,36 Furthermore, considering the inert and smooth RCF surface, the chemical treatment toward the surface is also necessary to enhance the interfacial adhesion between fibers and POM. In this work, a silane coupling agent was used to treat the RCF surface in terms of the aforementioned method described in experimental section.…”

Section: Surface Treatment Of Rcfmentioning

confidence: 99%

Mechanical enhancement, morphology, and crystallization kinetics of polyoxymethylene-based composites with recycled carbon fiber

Nie

Kang

Li³

et al. 2014

Journal of Thermoplastic Composite Materials

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Recycled carbon fiber (RCF) was employed as a reinforcing material to prepare polyoxymethylene (POM)-based composites through a simple melting extrusion. An effective approach was developed to clean and modify the surface of the as-received RCF with nitric acid and then with a silane coupling agent. The mechanical evaluation demonstrated that a significant reinforcement was achieved for POM/RCF composites due to the improved interfacial adhesion between the fibers and the matrix. The thermal stabilities of the composites were also improved in the presence of RCF. The morphological observation of impact fracture surfaces indicated that the RCF gained a homogeneous dispersion in POM matrix due to good interfacial boding between fibers and matrix. The studies on nonisothermal and isothermal crystallization behaviors showed that RCF acted as a nucleation agent for the crystallization of POM domain in composites; therefore, the crystallization rate and nucleation density increased remarkably due to the heterogeneous nucleating effect of RCF. These crystallization features may be advantageous for the enhancement of mechanical performance and processability of POM-based composites.

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“…As a feasible pathway, the oxidation of nitric acid toward as-received RCF cannot only clean the RCF but can also activate its surface. 36,37 Furthermore, considering of the inert and smooth RCF surface, the chemical treatment toward the surface is also necessary to enhance the interfacial adhesion between fibres and POM. In this work, a silane coupling agent was used to treat the RCF surface in terms of the aforementioned method described in experimental section.…”

Section: Surface Treatment Of Rcfmentioning

confidence: 99%

Development of sustainable polyoxymethylene-based composites with recycled carbon fibre: mechanical enhancement, morphology, and crystallization kinetics

Qian

Wang²,

Li³

et al. 2013

Journal of Reinforced Plastics and Composites

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Recycled carbon fibre was employed as a reinforcing material to prepare polyoxymethylene–based composites through a simple melting extrusion. An effective approach was developed to clean and modify the surface of as-received recycled carbon fibre with nitric acid and then with a silane-coupling agent. The mechanical evaluation demonstrated that a significant reinforcement was achieved for polyoxymethylene/recycled carbon fibre composites due to the improved interfacial adhesion between fibres and the matrix. The thermal stabilities of the composites were also improved in the presence of recycled carbon fibre. The morphological observation of impact fracture surfaces indicated a good interfacial boding between fibres and matrix. The studies on nonisothermal and isothermal crystallization behaviors showed that recycled carbon fibre acted as a nucleation agent for the crystallization of polyoxymethylene domain in composites; therefore, the crystallization rate and nucleation density increased remarkably due to the heterogeneous nucleating effect of recycled carbon fibre. These crystallization features may be advantageous for the enhancement of mechanical performance and processability of polyoxymethylene−based composites. Derived from a combination of polyoxymethylene and recycled carbon fibre, this study may provide a development guide for sustainable engineering materials with a great potential as well as a low cost for industrial and civil applications.

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XPS/ISS Investigation of Carbon Fibers Sequentially Exposed to Nitric Acid and Sodium Hydroxide

Cited by 39 publications

References 37 publications

Effect of various methods of pre-treatment of carbon fibers on the mechanical properties of PIP-based ceramics/carbon composites

Effect of various methods of pre-treatment of carbon fibers on the mechanical properties of PIP-based ceramics/carbon composites

Mechanical enhancement, morphology, and crystallization kinetics of polyoxymethylene-based composites with recycled carbon fiber

Development of sustainable polyoxymethylene-based composites with recycled carbon fibre: mechanical enhancement, morphology, and crystallization kinetics

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