Aplicação de FT-MIR e FT-NIR ao estudo de reação de cura de sistemas epoxídicos

Romão, Benedita M. V.; Diniz, Milton Faria; Pardini, Luiz Carlos; Dutra, Rita C. L.

doi:10.1590/s0104-14282004000300008

Cited by 6 publications

(14 citation statements)

References 7 publications

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“…The reactions between the epoxy and amine groups, as well as those occurring between epoxy and mercaptan, were studied in the spectral regions MIR and NIR. It was observed that asbestos does not interfere in the curing reactions and the FT-NIR evidences better the spectrometric changes during reactions in comparison to the FT-MIR analysis, similar to what occurred in the study by Romão [12] .…”

Section: Introductionsupporting

confidence: 83%

“…Figure 3 shows the NIR spectrum of the EP film. Table 1 indicates the main NIR bands and their probable assignment [12,24] which are characteristic of a DGEBA resin type.…”

Section: Transmission Nir/mir Analysis Of the Film Epmentioning

confidence: 99%

“…Romão et al [12] , in another study, also developed the characterization of EP DEGBA type, cured with agents based on mercaptan and tertiary amines, by middle infrared (FT-MIR) and near infrared (FT-NIR). The spectrometric changes resulting from the curing reaction were evaluated, when the disappearance of some characteristic functional groups occurred.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Out-of-Autoclave (OOA) epoxy system

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Section: Introductionsupporting

confidence: 83%

“…Figure 3 shows the NIR spectrum of the EP film. Table 1 indicates the main NIR bands and their probable assignment [12,24] which are characteristic of a DGEBA resin type.…”

Section: Transmission Nir/mir Analysis Of the Film Epmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Out-of-Autoclave (OOA) epoxy system

et al. 2017

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“…A utilização de diferentes materiais para o desenvolvimento de compósitos com melhores propriedades, demanda e estimula o desenvolvimento de novas metodologias que estabeleçam a relação estrutura/propriedade, fator importante para a aplicação adequada destes sistemas em projetos específicos e de grande porte, como os encontrados na indústria aeroespacial [1] .…”

Section: Introductionunclassified

“…Em trabalhos anteriores do nosso grupo [1,4] , foi possível demonstrar a separação e caracterização por FT-IR de agentes de cura do tipo anidrido em resina epoxídica e do tipo amido-amina em compósitos, com metodologia simples e rápida, envolvendo técnicas de pirólise controlada -FT-IR (CONTROLPIR/FT-IR), mesmo neste último sistema, onde era esperado um grau de dificuldade maior, por tratar-se de compósito.…”

Section: Introductionunclassified

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

et al. 2003

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Amostras de resina epoxídica (EP) curadas com compostos à base depolimercaptana (SH), SH na presença de poliamino amida, e amina modificada, constituindo, respectivamente, os sistemas epoxídicos (SE) 1, 2 e 3, foram preparadas segundo condições estabelecidas pelas curvas de calorimetria exploratória diferencial (DSC) de EP e agentes de cura, ou endurecedores (AC) e analisadas, antes e após preparação do SE, por espectroscopia no infravermelho com transformada de Fourier (FT-IR) por meio de técnicas de transmissão (pastilha de KBr, pirólise por bico de Bunsen, e pirólisecontrolada (CONTROLPIR/FT-IR) dentro da faixa de temperatura fornecida pela análise termogravimétrica (TG) dos SE 1, 2 e 3, para a caracterização de cada AC. Para tal fim, as absorções FT-IR do pirolisado líquido obtido pela metodologia CONTROLPIR/FT-IR foram avaliadas, em comparação ao espectro do AC de referência. A caracterização dos agentes de cura foi feita com a técnica TG/FT-IR do gás liberado de cada SE, em comparação ao espectro de referência do produto de degradação do respectivo AC.

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Portable near infrared spectroscopy applied to fuel quality control

Correia

Domingos

Cáo

et al. 2018

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Fuel quality control has gained interest in many countries owing to the potential damage of low-quality fuel to engines, the environment, and economy. Thus, the application of analytical techniques to verify quality control of fuels has become crucial. The portable micro-spectrometer in the near infrared region (microNIR) has gained credibility as a successful analytical technique in several quality control sectors. The possibility of real-time analysis using a nondestructive and reliable method is the main advantage of this methodology. In this work, chemometric models (PLS) were developed using microNIR data to determine the amount of biodiesel in diesel (LOD = 0.5wt%; LOQ = 1.8wt%; and RMSEP = 1.8wt%); sulfur in diesel (LOD = 2.4mgL; LOQ = 8.0mgL; and RMSEP = 13.2mgL); gasoline, ethanol, and methanol in C-type gasoline (LOD = 0.55wt%; LOQ = 1.84wt%; and RMSEP = 0.81wt%; LOD = 0.75wt%; LOQ = 2.5wt%; and RMSEP = 3.81wt%; and LOD = 0.85wt%; LOQ = 2.84wt%; and RMSEP = 1.80wt%); and water, methanol, and ethanol in ethanol-hydrated fuel (EHF) (LOD = 0.04wt%; LOQ = 1.29wt%; and RMSEP = 1.05wt%; LOD = 0.52wt%; LOQ = 1.73wt%; and RMSEP = 2.78wt%; and LOD = 1.22wt%; LOQ = 4.07wt%; and RMSEP = 4.41wt%). A total of 181 blends were prepared, with biodiesel and sulfur contents ranging from 0 to 100wt% and 10-500mgL, respectively. For gasoline blends, the gasoline, ethanol, and methanol contents ranged from 0.0 to 75.0wt%, 25.0-75.0wt%, and 0.0-50.0wt%, respectively. In the EHF control, the ethanol, water, and methanol contents ranged from 0.0 to 100.0wt%, 0.0-50.0wt%, and 0.0-50.0wt%, respectively. The proposed method presented high precision and accuracy in all cases, and the results showed that the microNIR technique had excellent performance in fuel quality control.

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Aplicação de FT-MIR e FT-NIR ao estudo de reação de cura de sistemas epoxídicos

Cited by 6 publications

References 7 publications

Evaluation of Out-of-Autoclave (OOA) epoxy system

Evaluation of Out-of-Autoclave (OOA) epoxy system

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

Portable near infrared spectroscopy applied to fuel quality control

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