Influência Dos Óleos Vegetais E Da Cera De Abelha Sobre a Vulcanização Do Copolímero De Estireno-Butadieno (Sbr)

Costa, Helson M. da; Ramos, Valéria D.; Sirqueira, Alex da Silva

doi:10.18540/jcecvl3iss7pp0955-0974

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…This analysis is often associated with the "stiffness" of a material and determines how rigid or weak a sample is, obtaining as a result (parameters) the storage modulus (E ), the loss modulus (E"), and the loss factor (tan δ). This factor depends on temperature, providing information on the interfacial bond between the reinforced filler and the polymer matrix of the composite material [21,22]. For the purposes of this particular study, a dynamic mechanical analysis will be carried out with a DMA-Q800 TA-Instrument.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Composite from TPS–EVOH–SBR Reinforced with Coconut Fiber

et al. 2020

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The aim of this research is to obtain a composite made of coconut fiber, thermoplastic starch (TPS), ethylene vinyl alcohol (EVOH), and styrene–butadiene copolymer (SBR), achieving the most significant criteria/attribute determined by users. The tools used were quality function deployment (QFD) and the theory of inventive problem solving (TRIZ). The end result indicated that the quality requirement and most representative attribute for users is the toxicity of the material. Four mixtures were made with different percentages of coconut fiber, TPS–EVOH, and SBR, subjecting them to Fourier transform infrared spectroscopy (FTIR), dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). The material obtained complies with the requirements of the Food and Drug Administration (FDA) regarding the nontoxicity of synthetic materials (EVOH and SB) to be used in contact with food (packaging and packaging). The spectra IR of the presence of monomers such as methacrylic acid, 2-hydroxyethyl acrylate, itaconic acid, among others, was not detected due to the humidity of the material. On the other hand, the DMA graphs showed that the mixtures achieved high storage modules (from 1500 to 3000 MPa) at temperatures from −90 to −70 °C, and the TGA thermogram showed that the last material to degrade was SBR at temperatures from 400 to 500 °C.

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Section: Introductionmentioning

confidence: 99%

“…Preliminary mixtures were prepared under the principle of thermal expansion of the TRIZ methodology to observe the behavior and properties at different temperatures. In studies [20,22,25], temperatures of 185, 170, 160, and 150 • C were used to make mixtures; for this study, temperatures of 100, 150, and 170 • C were used.…”

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confidence: 99%

Development of a Composite from TPS–EVOH–SBR Reinforced with Coconut Fiber

et al. 2020

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Vulcanização Da Borracha Natural Com Óleos Vegetais – Análise Teórica Do Processo Através Da Modelagem Molecular

Costa¹,

Ramos²

2023

Rev. Foco

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A modelagem molecular foi empregada para avaliar o processo de adsorção teórico durante a mistura dos aditivos e durante a formação de ligações cruzadas em composições de borracha natural (NR). A ideia foi acompanhar as mudanças ocasionadas quando óleos vegetais, simulados pelos seus componentes majoritários, substituem o ácido esteárico (C18) como ativador. Os resultados teóricos corroboram os dados experimentais de estudos anteriores e demonstram que as moléculas de C18 insaturadas apresentam um mecanismo adsorção com maior caráter químico. Tal fato, ao lado de outros parâmetros teóricos encontrados, inviabilizam um desempenho no mesmo patamar que o C18. O óleo de coco, simulado pela molécula de ácido graxo C12, vulcaniza a borracha natural, porém não com a mesma qualidade do C18. Provavelmente, as características teóricas do processo de adsorção e alguns parâmetros inerentes da molécula como, por exemplo, a dureza e a eletrofilicidade, sejam os fatores responsáveis pela formação de uma rede de ligações cruzadas de densidade inferior.

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Influência Dos Óleos Vegetais E Da Cera De Abelha Sobre a Vulcanização Do Copolímero De Estireno-Butadieno (Sbr)

Cited by 2 publications

References 3 publications

Development of a Composite from TPS–EVOH–SBR Reinforced with Coconut Fiber

Development of a Composite from TPS–EVOH–SBR Reinforced with Coconut Fiber

Vulcanização Da Borracha Natural Com Óleos Vegetais – Análise Teórica Do Processo Através Da Modelagem Molecular

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