Caracterização por FT-IR de agentes de cura utilizados em resinas epoxídicas-II-polimercaptana, poliaminoamida e amina modificada

Romão, Benedita M. V.; Diniz, Milton Faria; Azevedo, Margarete F. P.; Lourenço, Vera L.; Pardini, Luiz Carlos; Dutra, Rita C. L.; Burel, Fabrice

doi:10.1590/s0104-14282003000300007

Cited by 13 publications

(2 citation statements)

References 10 publications

(18 reference statements)

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“…Also, the bands at 1120 and 1480 cm -1 are typical of the ν-C-OC, δ s -CH 2 and δ a -CH 3 vibrations, respectively. 20 These vibration modes are invariant with respect to the formation of the complex and to the adsorption at the nanoparticles surface. Then, it is suggested that the alkyl chains adopt the stretched conformation irrespectively of the complex formation.…”

Section: Resultsmentioning

confidence: 99%

Preparation of amine coated silver nanoparticles using triethylenetetramine

et al. 2009

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This article presents a simple method towards the preparation of functionalized silver nanoparticles in a continuous medium. Silver nanoparticles were obtained through AgNO 3 chemical reduction in ethanol and triethylenetetramine was used to stabilize and functionalize the metal. The product was characterized with X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FTIR), UVvisible spectroscopy, thermal gravimetric analysis (TGA) and transmission electron microscopy (TEM). Monocrystalline silver particles with cubic structure and an average size of 20 nm were obtained. The results reveal that it is possible to synthesize Ag nanoparticles functionalized with amine groups and that particle size is influenced by the processing route.

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Section: Resultsmentioning

confidence: 99%

Preparation of amine coated silver nanoparticles using triethylenetetramine

et al. 2009

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“…Avaliação das propriedades mecânicas dos compósitos ternários com estequiometrias Phr 10,0 e 26,6 ASTM D790M [14] . [25] . Na Figura 2, a clivagem unidirecional está presente nas duas estequiometrias (Phr 10,0 e 26,6) do sistema epoxídico (Figures 2a e b).…”

Section: Avaliação Das Propriedades Mecânicas Dos Compósitos Ternáriounclassified

Influência da relação estequiométrica resina/endurecedor em propriedades mecânicas de compósitos ternários hierárquicos resina - epóxi/tecido de fibra de carbono/nanotubos de carbono

Lacerda¹,

Silva

Vilela

et al. 2014

Polímeros

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Resumo: A produção de materiais que apresentem alto desempenho em suas aplicações exige avanços tecnológicos e científicos. Os elevados valores de resistência à tração e módulo de elasticidade, aliados à flexibilidade, baixa densidade e alta razão de aspecto, fazem dos nanotubos de carbono excepcionais candidatos para reforçar compósitos poliméricos. Preparamos por laminação sistemas compósitos ternários à base de resina epóxi/tecidos de fibra de carbono (para os binários), acrescendo nanotubos de carbono para os sistemas ternários. Os parâmetros estequiométricos do sistema epoxídico (valor de Phr) e concentração de nanotubos de carbono empregado nos sistemas compósitos tiveram avaliadas suas morfologias (MEV), propriedades térmicas (TG) e mecânicas (ASTM D790). Embora o sistema epoxídico com Phr 10,0 tenha apresentado uma maior estabilidade térmica, os compósitos ternários produzidos a partir do sistema com Phr 26,6 mostraram valores de tensão máxima e módulo de elasticidade até 8 vezes maiores que aqueles produzidos com o sistema Phr 10. A adição de nanotubos de carbono aos compósitos com Phr 26,6 resultou em ganhos adicionais de aproximadamente 38 e 15% na tensão máxima e no módulo de elasticidade, respectivamente. Esses resultados revelaram a limitação nos métodos de integralização de nanoestruturas a sistemas compósitos, onde as dispersões estão limitadas a uma série de fatores inerentes a interação química e/ou física durante a fabricação dos compósitos nanoestruturados. Palavras-chave: Resina epóxi, tecidos de fibra de carbono, nanotubos de carbono, relação estequiométrica, propriedades térmicas, propriedades mecânicas. Influence of Resin/Hardener Stoichiometric Ratios on the Mechanical Properties of Hierarchical Ternary Composites -Epoxy Resin/Woven Carbon Fiber/Carbon NanotubesAbstract: The production of materials that exhibit high performance in their applications requires scientific and technological advances. The high values of tensile strength and modulus of elasticity, combined with flexibility, low density and high aspect ratio, make carbon nanotubes exceptional candidates for reinforced polymer composites. We prepared by lamination composite systems based on epoxy resin/woven carbon fiber (for binary), plus carbon nanotubes for the ternary systems. The effect of the stoichiometry of the epoxy system (Phr value) and concentration of carbon nanotubes used in the composite systems was evaluated by their morphological (SEM), thermal (TG) and mechanical properties (ASTM D790-10). Although the epoxy system with 10.0 Phr has presented a higher thermal stability, the ternary composite system produced with 26.6 Phr showed values of maximum stress and elastic modulus up to 8 times greater than those produced with the 10 Phr system. The addition of carbon nanotubes to composites with 26.6 Phr resulted in additional increase of approximately 38 and 15% of the maximum stress and elastic modulus, respectively. These results revealed a limitation in the methods of incorporation of the nanostructures in composit...

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Thermal curing of glass‐epoxy prepregs by luminescence spectroscopy

Sales

Diniz

Dutra

et al. 2010

J of Applied Polymer Sci

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In this study, we investigated the application of the luminescence spectroscopy technique in steady-state conditions to study glass fiber-epoxy F161 prepregs. We conducted this study by comparing the results obtained from the intrinsic fluorescence with Fourier transform near infrared spectroscopy. The extrinsic fluorescence of 9-anthroic acid (9-AA) was also used. Fourier transform infrared spectroscopy was also used to characterize the epoxide resin. The prepregs containing 9-AA and those that did not were heat-treated at 177 C (F161) for 1100 min at a 2 C/min heating rate. The results obtained by both methods indicated that the crosslinking reaction could be monitored by analysis of the spectral changes of the emission bands of the prepreg and 9-AA. The intrinsic emission at 320 nm was attributed to the fluorophore group containing the epoxy ring and was used to calculate the conversion degree. The photophysical behavior of the 9-AA probe indicated a reduction of free volume of the polymeric matrix with curing process.

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Caracterização por FT-IR de agentes de cura utilizados em resinas epoxídicas-II-polimercaptana, poliaminoamida e amina modificada

Cited by 13 publications

References 10 publications

Preparation of amine coated silver nanoparticles using triethylenetetramine

Preparation of amine coated silver nanoparticles using triethylenetetramine

Influência da relação estequiométrica resina/endurecedor em propriedades mecânicas de compósitos ternários hierárquicos resina - epóxi/tecido de fibra de carbono/nanotubos de carbono

Thermal curing of glass‐epoxy prepregs by luminescence spectroscopy

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