Modificação da rugosidade de fibras de carbono por método químico para aplicação em compósitos poliméricos

Burakowski, Liliana; Rezende, Mirabel Cerqueira

doi:10.1590/s0104-14282001000200006

Cited by 23 publications

(17 citation statements)

References 2 publications

(4 reference statements)

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“…These results indicate that a progressive weight loss occurred with CO 2 evolution 4,17 , suggesting that active site atoms on the fiber surface were oxidized to form oxygen-containing surface groups such as C-OH, C=O, COOH and finally CO 2 7 . An analysis of the uncertainties involved in the measurements of carbon fibers treated with argon and oxygen plasma showed similar values which were lower than those of fibers treated with hydrochloric and nitric acids.…”

Section: Plasma Treatmentmentioning

confidence: 91%

“…However, when applied without previous surface treatment, these fibers produce composites with low interlaminar shear strength (ILSS). Numerous methods have been developed to improve the fiber surface wettability or to increase the quantity of surface functional groups [1][2][3][4][5] . The interfacial bond between the carbon filaments and the resin matrix can be enhanced by enlarging the surface area, which provides more points of contact/anchorage between the fiber and the matrix, or by enhancing the physicochemical interaction between the components 1,5 .…”

Section: Introductionmentioning

confidence: 99%

“…Oxidation methods consist of oxidizing the carbon fiber in a liquid or gas environment to form oxygen-containing functional groups such as carboxyl, carbonyl, lactone and/or hydroxyl groups on the surface of the fiber, while simultaneously increasing the surface area of the carbon fiber 4,6,7 . Several studies have attempted to generate strong adhesion between the fiber surface and matrix [1][2][3][4][7][8][9] to improve the stress transfer from the relatively weak and compliant matrix to the strong and stiff reinforcing fibers 7,10 . In this study, the surfaces of the carbon fibers were chemically and physically modified using nitric and hydrochloric acids, as well as cold plasma in argon and oxygen atmospheres.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of carbon fiber surface treated by chemical and cold plasma processes

et al. 2005

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Sized PAN-based carbon fibers were treated with hydrochloric and nitric acids, as well as argon and oxygen cold plasmas, and the changes on their surfaces evaluated. The physicochemical properties and morphological changes were investigated by atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), tensile strength tests and Raman spectroscopy. The nitric acid treatment was found to cause the most significant chemical changes on the carbon fiber surface, introducing the largest number of chemical groups and augmenting the roughness. The oxygen plasma treatments caused ablation of the carbon fiber surface, removing carbon atoms such as CO and CO 2 molecules. In addition, the argon plasma treatment eliminated defects on the fiber surface, reducing the size of critical flaws and thus increasing the fiber's tensile strength.

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Section: Plasma Treatmentmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of carbon fiber surface treated by chemical and cold plasma processes

et al. 2005

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“…The esterification is a typical chemical modification process usually described in literature for surface modification of plant fibers. The esterification can also be an important reaction for surface modification of CNC in order to increase compatibility between the reinforcement and the matrix . In this way, modifications of surface energies of CNCs after chemical modifications are frequently noticed as well the improvements of the compatibility of modified ones with traditional matrices are normally pointed out .…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite of cellulose acetate reinforced with nanocrystals modified chemically: Modification with bifunctional reagent

2018

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A special class of nanocomposites (NCPs) of great scientific interest, are polymers reinforced with cellulose nanoparticless (cellulose nanocrystals [CNCs] and cellulose nanofibrils). Particularly, studies involving thermoplastics and nano reinforcements that are widely reported in the literature due to the wide variety of natural fibers sources in combination with various polymeric matrices. Conversely, there are few works in the literature that deal with the superficial modification of CNC with bifunctional reagents. It is known, that the formation of covalent chemical linkages between reinforcement and the matrix confer greater adhesions between the reinforcement and the matrix, hence in a genera way showing improvements in mechanical properties of NCPs. This work describes the development of a new NCP composed of CNCs extracted from Typha domingensis and films of cellulose acetate (CA) as a matrix. Conversely, a bifunctional reagent, 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride (BTDA) was employed in order to modify nanocrystal surface. The inclusion of nanocrystal caused a significant increase of mechanical properties of some NCPs when compared with the matrix. POLYM. COMPOS., 40:E321–E332, 2019. © 2018 Society of Plastics Engineers

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“…O tratamento de superfície de polímeros pode ser realizado por vários métodos desde processos químicos por via úmida, através da ação de substâncias oxidantes, até processos a seco, como a oxidação eletroquímica ou anôdica [3] , tratamento térmico [4] , por chama [5] , polimerização a plasma [6,7] e a laser [8,9] . Tal tratamento provoca modificações químicas na superfície do material, induzindo a formação de grupos funcionais polares capazes de aumentar a interação entre os polímeros do substrato e do revestimento por meio de ligações secundárias [3] , melhorando a molhabilidade do substrato [10] e consequentemente a aderência da camada polimérica hidrofílica depositada [11] .…”

Section: Introductionunclassified

Tratamento de superfície de tubos de poliamida 11 com chama para deposição de revestimento hidrofílico biomédico

Martins¹,

Fúcio²,

Mattoso³

et al. 2010

Polímeros

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Resumo: O processo para obtenção de uma camada polimérica hidrofílica sobre um componente polimérico pode ser basicamente dividido em: tratamento de superfície do substrato, aplicação e cura do revestimento. O tratamento de superfície se faz necessário em função da grande diferença de polaridade comumente apresentada entre os materiais que compõem este conjunto e da baixa energia livre de superfície inerente aos principais materiais utilizados como substrato, fatores estes que dificultam a adesão entre eles. Neste trabalho foi avaliada a influência da técnica de tratamento de superfície através de exposição à chama sobre a tentativa de aumento da energia livre de superfície de tubos de poliamida 11. Amostras foram submetidas ao tratamento durante 5, 10, 20, 30 e 60 segundos, e posteriormente caracterizadas por goniometria, microscopia eletrônica de varredura, espectroscopia de infravermelho e resistência ao risco da camada depositada. Amostras não tratadas foram analisadas como parâmetro de controle das modificações. Os resultados mostraram um aumento da molhabilidade e rugosidade da superfície, além de uma melhoria na adesão da camada hidrofílica após o tratamento. Palavras-chave: Poliamida 11, tratamento de superfície, revestimento hidrofílico. Flame Surface Treatment of Polyamide 11 Tubes for the Deposition of Biomedical Hydrophilic CoatingsAbstract: The process of obtaining a hydrophilic polymer coating on a polymeric component or product can be basically divided into: the substrate surface treatment, the coating application and the cross-linking. The substrate surface treatment is crucial due to the possible large difference in polarity between the polymers and the substrate materials, which commonly have low free surface energy and may severely hamper adhesion. This study evaluated the influence of flame surface treatment for the attempt of increasing the free energy surface of polyamide 11 tubes. Samples were submitted to treatment for 5, 10, 20, 30 and 60 seconds, and subsequently characterized by goniometry, scanning electron microscopy, infrared spectroscopy and scratch resistance of the deposited layer. Untreated samples were analyzed as a control parameter of the changes. The results showed an increase in wettability and surface roughness, and also an improvement in the adhesion of the hydrophilic coating after treatment. Keywords: Polyamide 11, surface treatment, hydrophilic coating. IntroduçãoA incorporação de procedimentos menos invasivos à prática cirúrgica de forma geral tem proporcionado a médicos e principalmente a pacientes, muitas facilidades e benefícios frente às tradicionais técnicas equivalentes. Por meio de pequenas incisões localizadas e de equipamentos específicos, o manuseio cirúrgico fica restrito apenas à área enferma, preservando assim as estruturas periféricas. Dentre as inúmeras vantagens apresentadas por estas técnicas destaca-se a redução da necessidade de reposição de sangue, a diminuição do tempo de internação, da probabilidade de infecções e das dores pós-operatórias [1] . ...

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Modificação da rugosidade de fibras de carbono por método químico para aplicação em compósitos poliméricos

Cited by 23 publications

References 2 publications

Evaluation of carbon fiber surface treated by chemical and cold plasma processes

Evaluation of carbon fiber surface treated by chemical and cold plasma processes

Nanocomposite of cellulose acetate reinforced with nanocrystals modified chemically: Modification with bifunctional reagent

Tratamento de superfície de tubos de poliamida 11 com chama para deposição de revestimento hidrofílico biomédico

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