Synthesis of Polyamide 6/6 by Interfacial Polycondensation with the Simultaneous Impregnation of Carbon Fibers

Botelho, Edson Cocchieri; Scherbakoff, Natália; Rezende, Mirabel Cerqueira; Kawamoto, Aparecida M.; Sciamareli, Jairo

doi:10.1021/ma000902k

Cited by 40 publications

(41 citation statements)

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“…A great deal of work dealing with fiber/ matrix interfacial properties has been performed. [17][18][19][20][21][22] In this study, PA6 oligomer was impregnated into the long glass fiber which was treated with a coupling agent in order to obtain high-impregnation composites. Compared to conventional methods, a higher glass fiber content can be obtained by the new technique.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Long Glass Fiber Reinforced PA6 Composites Prepared by a Novel Process

Han

Liu

2005

Macro Materials & Eng

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Summary: Long glass fiber reinforced PA6 (LGF/PA6) prepregs were prepared by impregnating PA6 oligomer melt into reinforcing glass fiber followed by subsequent solid‐state polymerization (SSP) to obtain LGF/PA6 composite pellets. A conventional injection‐molding machine suitable for short glass fiber reinforced composites was applied to the processing of the prepared composites, which reduced the fiber length in the final products. Mechanical properties, thermal property, and fiber length distribution of injection molding bars were investigated. Scanning electron microscopy (SEM) was used to observe the impact fracture surfaces and the surfaces of glass fiber after the SSP. It was found that the LGF/PA6 composites were of favorable mechanical properties, especially the impact strength, although the average length of glass fiber was rather short. By this novel process, the content of glass fiber in composite could be high up to 60 wt.‐% and the maximum level of heat distortion temperature (HDT) was close to the melting temperature of PA6. SEM images indicated the favorable interfacial properties between the glass fiber and matrix. The glass fiber surfaces were further observed by SEM after removing the matrix PA6 with a solvent, the results showed that PA6 macromolecules were grafted onto the surface. Furthermore, the grafting amount of PA6 was increased with SSP time.

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Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Long Glass Fiber Reinforced PA6 Composites Prepared by a Novel Process

Han

Liu

2005

Macro Materials & Eng

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“…The automotive industry has traditionally produced a wide range of thermoplastic parts with the advantage of shorter Botelho et al, 2005;Botelho et al, 2002;Botelho et al, 2001;Todo et al, 2000). et al, 2010;Vieille et al, 2009;Young and Ye, 2005;Botelho et al, 2003).…”

Section: High Performance Thermoplastic Composites For Aerospace Applmentioning

confidence: 99%

A review of welding technologies for thermoplastic composites in aerospace applications

Costa¹,

Botelho²,

Costa³

et al. 2012

JATM

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130

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“…Uma terceira matriz de poliamida 6,6 foi obtida a partir da polimerização interfacial do cloreto de adipoíla e do hexametilenodiamina [32] , sobre os cabos de fibras de carbono [32][33][34] . A partir destes cabos foram obtidos 8 metros de tecido de fibras de carbono impregnada com poliamida 6,6 tipo plain weave (trançagem 1 x 1), utilizando-se um tear de pedais.…”

Section: Materiaisunclassified

Caracterização Mecânica de Compósitos de Poliamida/Fibra de Carbono Via Ensaios de Cisalhamento Interlaminar e de Mecânica da Fratura

Botelho¹,

Rezende²

2002

Polímeros

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Resumo:Compósitos termoplásticos a partir de poliamidas 6 e 6,6 e tecido de fibras de carbono com 40, 50 e 60 % em volume de reforço foram processados via moldagem por compressão a quente e caracterizados por ensaios mecânicos destrutivos (cisalhamento interlaminar em três pontos (short-beam), cisalhamento interlaminar por compressão (CST) e ensaios de mecânica da fratura) e por inspeção não-destrutiva (ultrasom e microscopias óptica e eletrônica de varredura). Os resultados obtidos mostraram que os compósitos termoplásticos processados apresentaram uma distribuição homogênea do polímero no reforço. Entretanto, nos compósitos com maior quantidade de poliamida (40 % de reforço) foram observadas regiões ricas em matriz entre as camadas de tecido. Os ensaios de mecânica da fratura (DCB e ENF) e de cisalhamento interlaminar em três pontos não apresentaram falha interlaminar, não sendo observada a propagação de trincas de forma homogênea e retilínea no interior do material. Em função destes resultados foi utilizado o ensaio de cisalhamento por compressão, desenvolvido no Institute of Polymer Research Dresden da Alemanha, que permitiu uma caracterização mais precisa dos compósitos termoplásticos estudados. Foi observado também, a partir dos ensaios de CST, que os compósitos obtidos da poliamida 6,6 apresentaram um aumento no valor do cisalhamento interlaminar de até 20 % com o aumento do volume de fibras. Palavras-chave: Compósitos termoplásticos, poliamida, fibras de carbono, ensaios mecânicos. Mechanical Characterization of Polyamide/Carbon Fiber Composites by Using Interlaminar Shear Strength and Fracture Mechanical TestsAbstract: Thermoplastics composites of polyamide 6 and 6.6 reinforced with carbon fiber fabric were obtained by compression molding and characterized by destructive (short-beam, compression shear (CST) and fracture mechanics testing) as well as by non-destructive inspection (ultrasound analysis, optical and scanning electron microscopy). The results show that, in general, the matrix was homogeneously distributed about the reinforcing fabric. However, for the composites with higher polyamide content (>50%) matrix-rich regions were observed between the fabric layers. Fracture mechanics (DCB and ENF) as well as short-beam testing did not show evidence of inter-laminar failure as there were non-homogeneous linear crack propagation patterns in the composites investigated. As a result, a compression shear test (CST), developed in the Institute of Polymer Research in Dresden, Germany, was conducted. This test allowed a more precise characterization of the thermoplastic composites studied here.

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Synthesis of Polyamide 6/6 by Interfacial Polycondensation with the Simultaneous Impregnation of Carbon Fibers

Cited by 40 publications

References 10 publications

Preparation and Mechanical Properties of Long Glass Fiber Reinforced PA6 Composites Prepared by a Novel Process

Preparation and Mechanical Properties of Long Glass Fiber Reinforced PA6 Composites Prepared by a Novel Process

A review of welding technologies for thermoplastic composites in aerospace applications

Caracterização Mecânica de Compósitos de Poliamida/Fibra de Carbono Via Ensaios de Cisalhamento Interlaminar e de Mecânica da Fratura

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