Study of antioxidant property of a thiosphorated compound derived from cashew nut shell liquid in hydrogenated naphthenics oils

Lopes, Ada Amélia Sanders; Carneiro, E. A.; Rios, Maria Alexsandra de Sousa; Filho, João José Hiluy; Carioca, José Osvaldo Beserra; Barros, Geovânio Lima; Mazzetto, Selma Elaine

doi:10.1590/s0104-66322008000100013

Cited by 20 publications

(15 citation statements)

References 9 publications

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“…The DSC curve related to the bM polyol (Figure 5a) in the first scan shows an inflection point due to a transition phase corresponding to the glass transition temperature (T g ) [31,32] around 75 • C. No other phenomena were recorded. In the second scan, along with the T g at 75 • C, an endothermic peak with a maximum at 250 • C was present, which could be correlated to the evaporation of aliphatic or aromatic hydrocarbon molecules with low molecular weight present within the bM polyol, as also hypothesized by Lopes et al [31,32]. In the case of the bS DSC thermogram (Figure 5b), a semi-crystalline behavior was observed due to the presence of either a first-or second-order thermodynamic transitions.…”

Section: Polyols Characterizationsmentioning

confidence: 99%

Upgrading Sustainable Polyurethane Foam Based on Greener Polyols: Succinic-Based Polyol and Mannich-Based Polyol

et al. 2020

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It is well known that the traditional synthetic polymers, such as Polyurethane foams, require raw materials that are not fully sustainable and are based on oil-feedstocks. For this reason, renewable resources such as biomass, polysaccharides and proteins are still recognized as one of the most promising approaches for substituting oil-based raw materials (mainly polyols). However, polyurethanes from renewable sources exhibit poor physical and functional performances. For this reason, the best technological solution is the production of polyurethane materials obtained through a partial replacement of the oil-based polyurethane precursors. This approach enables a good balance between the need to improve the sustainability of the polymer and the need to achieve suitable performances, to fulfill the technological requirements for specific applications. In this paper, a succinic-based polyol sample (obtained from biomass source) was synthesized, characterized and blended with cardanol-based polyol (Mannich-based polyol) to produce sustainable rigid polyurethane foams in which the oil-based polyol is totally replaced. A suitable amount of catalysts and surfactant, water as blowing reagent and poly-methylene diphenyl di-isocyanate as isocyanate source were used for the polyurethane synthesis. The resulting foams were characterized by means of infrared spectroscopy (FTIR) to control the cross-linking reactions, scanning electron microscopy (SEM) to evaluate the morphological structure and thermal gravimetric analysis (TGA) and thermal conductivity to evaluate thermal degradation behavior and thermal insulation properties.

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Section: Polyols Characterizationsmentioning

confidence: 99%

Upgrading Sustainable Polyurethane Foam Based on Greener Polyols: Succinic-Based Polyol and Mannich-Based Polyol

et al. 2020

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“…In this context, in the last years, the CNSL has gained importance in the development of sustainable chemistry [15] as a raw material for new primary and secondary antioxidants, flame-retardants, porphyrins, composites and biopolymers [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus cardanol: chemical characterization and thermal stability

et al. 2016

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Devido à grande utilização do cardanol para o desenvolvimento de novos aditivos, o presente trabalho tem como objetivos apresentar a caracterização química do fósforo cardanol, a qual foi verificada utilizando-se FTIR e técnicas termoanalíticas (TG/DSC/DTA) e, a avaliação antioxidante do composto em um óleo lubrificante de base naftênica. Neste trabalho, os autores incluíram também o estudo térmico do fósforo cardanol por aquecimento em estufa, com monitoramento das alterações em FTIR. De acordo com os resultados, o fósforo cardanol apresentou boa estabilidade térmica quando comparado a outros ésteres de fosfato de mesma classe e, não apresentou alterações antes e após aquecimento a 120 ° C, sob atmosfera de ar. Desta forma, o composto de fósforo obtido a partir do cardanol apresenta potencial de aplicação, como aditivo, em óleos lubrificantes e produtos petroquímicos do mesmo segmento. Palavras-chave: LCC, oxidação, estabilidade térmicaDue to the wide use of the cardanol to develop new additives, this study presents the chemical characterization of phosphorus cardanol using FTIR and Thermoanalytical techniques (TG / DSC / DTA), and the evaluation of the antioxidant potentiality of compound when added to a lubricating oil. In this paper, the authors also included the thermal study of phosphorus cardanol by heating in an oven, monitoring changes in FTIR. According to results, the phosphorus cardanol showed good thermal stability when compared with other compounds of the same class "phosphate esters" and showed no changes before and after heating at 120 ° C, under air atmosphere. Thus, the phosphorus compound derived from cardanol has potential application as additive for lubricating oils and petrochemicals of the same segment.

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“…In the last few years, our group has dedicated special attention to the antioxidant properties exhibited by cardanol and its phosphorylated derivatives in different materials (Lomonaco et al, 2011;De Souza Rios et al, 2009;Lopes et al, 2008;Rios Façanha et al, 2007). The results obtained were very satisfying, keeping us focused on improving the performance and expanding the areas of utilization of these fascinating compounds.…”

Section: Introductionmentioning

confidence: 99%

Antiwear and antioxidant studies of cardanol phosphate ester additives

Mazzetto

Oliveira

Lomonaco

et al. 2012

Braz. J. Chem. Eng.

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-In the search for new applications and products derived from Cashew Nut Shell Liquid (CNSL), we report herein the synthesis and characterization (GC/MS and 1 H, 13 C, and 31 P NMR) of four phosphate esters derived from hydrogenated cardanol, including their applications as antiwear additives for diesel (S500) and as antioxidant additives for mineral oils, evaluated through the HFRR test and oxidative stability analyses, respectively. The results obtained showed very good to excellent performances promoted by the bioadditives evaluated, especially for the thiophosphorylated derivative, which notably reduced the sludge residue and the acidity index of the oxidized oil (0.52 mg NaOH/g sample) and also improved the diesel lubricity, reducing the wear of metal parts by more than 50% (330 μm).

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Study of antioxidant property of a thiosphorated compound derived from cashew nut shell liquid in hydrogenated naphthenics oils

Cited by 20 publications

References 9 publications

Upgrading Sustainable Polyurethane Foam Based on Greener Polyols: Succinic-Based Polyol and Mannich-Based Polyol

Upgrading Sustainable Polyurethane Foam Based on Greener Polyols: Succinic-Based Polyol and Mannich-Based Polyol

Phosphorus cardanol: chemical characterization and thermal stability

Antiwear and antioxidant studies of cardanol phosphate ester additives

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