Avaliação da aplicabilidade de técnicas MIC/FT-IR/DSC para a caracterização de filmes multicamadas

Nogueira, Luciano M.; Dutra, Rita C. L.; Diniz, Milton Faria; Pires, M. A.; Santana, Fernanda A. de; Tomasi, Leandro; Santos, Priscila dos; Nonemacher, Regina

doi:10.1590/s0104-14282007000200015

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Como a atividade dos microbicidas sugeriu a sua presença numa camada bem superficial da tinta, foi realizada a análise PAS, que, por suas características, já descritas, examina uma camada bem fina da superfície dos materiais, especialmente em maiores velocidades. Em função da velocidade 0,20 cm/s já ter apresentado bons resultados, em publicação recente do grupo [30] , foi adotada para esse estudo.…”

Section: Resultsunclassified

Análise por FT-IR (UATR E PAS) de microbicidas em filmes poliméricos de tintas comerciais

et al. 2014

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Resumo: Este trabalho mostra a avaliação de duas técnicas de espectroscopia no infravermelho por transformada de Fourier (FT-IR), Universal Reflexão Total Atenuada (UATR) e Detecção Fotoacústica (PAS), para a caracterização dos microbicidas, OIT, carbendazim e diuron, mais comuns em tintas acrílicas imobiliárias, levando-se em conta as características de cada técnica de análise de superfície tal como a profundidade de amostragem, sob o aspecto qualitativo. A análise PAS, utilizando-se a velocidade de 0,20 cm.s -1 , mostrou-se a única adequada ao estudo. A presença dos microbicidas na película de tinta seca foi, também, confirmada por meio de análises microbiológicas e HPLC. Palavras-chave: Tintas, microbicidas, FT-IR, UATR, PAS. Analysis by FT-IR Techniques (UATR and PAS) of Microbicides in Polymeric Films of Commercial PaintsAbstract: This paper shows the evaluation of two Fourier transform infrared spectroscopy techniques (FT-IR), Universal Attenuated Total Reflection (UATR) and Photoacoustic Detection (PAS), for the characterization of the microbicides OIT, carbendazim and diuron, which are used in acrylic paint formulations. We considered the characteristics of each surface analysis technique, such as sampling depth. The PAS analysis, using the speed of 0.20 cm.s -1 , proved to be the only technique suitable for the study. The presence of the referred microbicides in the dried paint film was also confirmed by microbiological and HPLC analyses. Keywords: Paint, microbicides, FT-IR, UATR, PAS. IntroduçãoMateriais de recobrimento, como as tintas, contêm água, dispersões poliméricas, pigmentos, cargas, modificadores reológicos, aditivos e outros ingredientes. São, potencialmente, suscetíveis ao ataque microbiológico no seu estado úmido e precisam ser preservados com produtos químicos, denominados microbicidas, popularmente designados biocidas, atuando neste caso, especificamente, como preservantes ou conservantes [1] . Atualmente, recobrimentos arquitetônicos interiores são os materiais com maiores demandas e restrições ambientais e toxicológicas para os preservantes, e isso explica porque tão poucas moléculas são usadas para a preservação de tintas e em tão baixas concentrações quanto possível, geralmente <1% [2] .Os microbicidas são produtos incorporados às tintas, cuja função é protegê-las, tanto no estado úmido quanto no estado seco, visando à inibição do crescimento de microrganismos (ou sua morte), garantindo maior durabilidade às tintas e aos filmes secos [1,3,4] . São classificados conforme seu uso, sendo conhecidos como fungicidas, bactericidas e algicidas. Existem no mercado cerca de 250 diferentes microbicidas, destinados à proteção da tinta na lata e do filme aplicado [5] . Os fungicidas 2-methoxicarbonilamino-benzimidazol (carbendazim), 2-N-octil-4-isotiazolin-3-ona (OIT) e o algicida N'-(3,4-diclorofenil)-N,N-dimetilurea (diuron) são os microbicidas mais populares no mercado brasileiro para a preservação do filme seco.Devido a sua alta toxicidade para fungos, o OIT é usado, principalmente, como um ...

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Section: Resultsunclassified

Análise por FT-IR (UATR E PAS) de microbicidas em filmes poliméricos de tintas comerciais

et al. 2014

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“…Figure 4 shows the FTIR spectra of PPc, PPcr, and PPc/PPcr blends, non-aged and aged for 30 and 60 days, respectively. In the spectra of non-aged PPc and PPcr, the main PP bands were observed at 808 cm −1 , due to the angular deformation of the out-of-plane C-H; at 841 cm −1 and 1168 cm −1 ,corresponding to C-C isopropyl stretching; and at 974 and 1000 cm −1 , due to C-C stretching of CH 2 and CH 3 groups [27,28], respectively. The band at 1304 cm −1 corresponds to CH 2 vibrations; at 1375 and 1455 cm −1 , due to the symmetrical and asymmetrical angular deformations, respectively, of CH 3 [29,30].…”

Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

From Waste to Potential Reuse: Mixtures of Polypropylene/Recycled Copolymer Polypropylene from Industrial Containers: Seeking Sustainable Materials

et al. 2022

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This work investigated the effect of thermo-oxidation aging in blends of copolymer polypropylene (PPc)/recycled copolymer polypropylene (PPcr) from industrial container waste, coded as PPc/PPcr blends. All compounds were melt extruded, and the injection molded specimens were characterized by mechanical properties (tensile and impact), Fourier-transform infrared spectroscopy (FTIR), melt flow index (MFI), contact angle, heat deflection temperature (HDT), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). FTIR spectra presented bands related to the hydroperoxides and carbonyl groups, as resulted from thermo-oxidation aging. The contact angle decreased upon a thermo-oxidation aging influence, corroborating the FTIR spectra. PPcr presented higher MFI as a consequence of reprocessing. Impact strength and elongation at break were quite sensible to the thermo-oxidation aging influence and were progressively reduced upon increased time, whereas tensile strength, elastic modulus, and HDT only slightly changed. SEM images of PPc presented a higher quantity of pulled-out particles, resulted from a lower interaction between phases, i.e., polypropylene and ethylene/propylene. From the impact strength and toughness data, proper dissipation energy mechanisms were found in PPc/PPcr blends. Summing up, using PPcr contributed to minimize properties’ losses, which may be related to the stabilizer agents, whereas the described results presented great potential for the PP market, while contributing to the sustainable environment.

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“…With the development of various polymers, there is also the need for the advancement of instrumental analysis techniques in order to determine the chemical structure of new materials and/or quantify them. As known, the FT-IR spectroscopy is one of the techniques that has merit for this purpose and has been successfully applied to various polymer systems in the group's laboratories of the Divisão de Química (AQI) of the Instituto de Aeronáutica e Espaço (IAE), including the use of last-edge techniques with surface analysis (universal attenuated total reflectance -UATR) in wide spectral range (mid-infrared, MIR, near-infrared, NIR, and others) [9][10][11] . The opportunity to develop a methodology applied to polymer blends, used in the automotive sector, is still not very explored; therefore, in the literature, FT-IR studies could be found for other types of materials for this sector, but not for the proposition of the present research.…”

Section: Introductionmentioning

confidence: 99%

FT-IR methodology (transmission and UATR) to quantify automotive systems

2018

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ObstractWhen using Fourier transform infrared spectroscopy (FT-IR) under the qualitative aspect for characterization of polymer blends, often a simple identification of each one of the existing polymers in the blend does not justify the material failure since different amounts of each component may result in different mechanical properties, which should be a possible cause for of material failure when applied to an automotive part. Thus, seeking for a better justification in the understanding of material failure analysis, a new quantitative FT-IR methodology was developed in the mid-infrared region (MIR), using the transmission techniques and universal attenuated reflectance for the determination of Acrylonitrile Butadiene Styrene (ABS) and polycarbonate (PC). Transmission mode was more suitable. The relative band (A 831 /A 2237 ) was chosen for the preparation of the calibration curve that showed a 0.99% error methodology, which is within the FT-IR spectrometer accuracy limit (≤ 2%); therefore, it is accurate for the analysis of the system.

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Avaliação da aplicabilidade de técnicas MIC/FT-IR/DSC para a caracterização de filmes multicamadas

Cited by 8 publications

References 13 publications

Análise por FT-IR (UATR E PAS) de microbicidas em filmes poliméricos de tintas comerciais

Análise por FT-IR (UATR E PAS) de microbicidas em filmes poliméricos de tintas comerciais

From Waste to Potential Reuse: Mixtures of Polypropylene/Recycled Copolymer Polypropylene from Industrial Containers: Seeking Sustainable Materials

FT-IR methodology (transmission and UATR) to quantify automotive systems

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