Study of the biodegradation of a polymer derived from castor oil by scanning electron microscopy, thermogravimetry and infrared spectroscopy

Cangemi, José M.; Neto, Salvador Claro; Chierice, Gilberto Orivaldo; Santos, Antonia Marli dos

doi:10.1590/s0104-14282006000200013

Cited by 46 publications

(26 citation statements)

References 2 publications

(1 reference statement)

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“…The biodegradation of this polymer by fungal and bacterial attack were demonstrated through Scanning Electron Microscopy (SEM), Thermogravimetry (TGA) and Infrared Spectroscopy (FTIR). The authors demonstrated that the degradation mechanisms are the same used by the microorganisms in fats [7] . Trovati et al [8] used FTIR, TGA and X-ray Diffractometry (DRX) to investigate the rigid, semi rigid, and soft polyurethane obtained through different ratios between pre-polymer and polyol, showing that different ratios cause differences in thermal behavior and crystalline structure of the synthesized polyurethane.…”

Section: Introductionmentioning

confidence: 96%

Polyurethane derived from Ricinus Communis as graft for bone defect treatments

et al. 2018

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Section: Introductionmentioning

confidence: 96%

Polyurethane derived from Ricinus Communis as graft for bone defect treatments

et al. 2018

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“…El uso de materias primas renovables como es el aceite de castor, permite obtener un producto competitivo con los petroquímicos a nivel comercial, de durabilidad y con minimización del impacto ambiental al ser dispersados en agua y biodegradables [7][8][9] .…”

Section: Resultados Y Análisisunclassified

Síntesis y caracterización de adhesivos reposicionables de poliuretano dispersos en agua, obtenidos a partir de aceite de castor maleinizado

et al. 2010

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Resumen: El presente trabajo se centró en la producción de dispersiones acuosas de poliuretano empleando el método de emulsificación por inversión de fases. Para la síntesis fueron empleados dos polioles: uno comercial tipo poliéster y el otro es aceite de castor maleinizado (MACO); dos diisocianatos, uno aromático Toluen diisocianato (TDI) y otro alifático Hexametilen diisocianato (HDI), siendo poco comunes para esta aplicación. Como emulsificante interno se empleó ácido cítrico el cual es muy económico y de fácil adquisición. Como factores se evaluaron la cantidad de ácido cítrico y la relación molar de grupos isocianato a hidroxilos (NCO/OH), generando un diseño de experimentos factorial 3 2 y minimizando el contenido de sólidos sedimentados. Mediante la metodología de superficie de respuesta, se obtuvo una ecuación polinomial cuadrática por un análisis de regresión múltiple. Los poliuretanos formados fueron evaluados en cuanto a sus propiedades adhesivas y mecánicas (pegajosidad tack, pegajosidad en cinta loop tack, cohesión hold, pelado peel), lo que permitió clasificar el adhesivo como reposicionable, para emplearlo en etiquetas. Palabras-clave: Adhesivos reposicionables, poliuretano, dispersiones, aceite de castor. Synthesis and Characterization of Pressure-Sensitive Adhesives of Waterborne Polyurethane from Maleinizated Castor OilAbstract: This work focused on the production of aqueous dispersions of polyurethane using the emulsification method by phase inversion. For the synthesis two polyols were employed, viz. a commercial polyester and Maleinizated Castor Oil (MACO), with two diisocyanates: one aromatic, toluene diisocyanate (TDI) and another aliphatic, hexamethylene diisocyanate (HDI), which are not common for this application. Citric acid was used as internal emulsifier which is inexpensive and readily available. The parameters were the amount of citric acid and the mole ratio of isocyanate groups to hydroxyl (NCO/OH), generating a 3 2 factorial design, with minimization of the sedimented solids. The surface methodology was used to obtain a quadratic polynomial equation by multiple regression analysis. Polyurethanes synthesized were evaluated for their mechanical and adhesive properties (tack, loop tack, hold, peel). These measurements allowed classifying the polyurethanes synthesized as repositionable adhesives, for use in labels.

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“…In the tests con- ducted, this foam presented a biodegradation response that was inferior to that presented by foam of vegetable origin. Utilizing the same microorganisms cited in a study by Cangemi et al [24] accompanied the biodegradation process of polyurethane foams utilizing the techniques of Scanning Electron Microscopy (SEM), thermogravimetry (TG) and Fourier-transform infrared spectroscopy with an accessory for attenuated total reflectance (FTIR-ATR). The results suggest that the degradation of polyurethane derived from castor oil occurs.…”

Section: Discussionmentioning

confidence: 99%

Biodegradation of polyurethane derived from castor oil

Cangemi¹,

Santos

Neto

et al. 2008

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The aim of this research was to study the biodegradation of a polymer derived from castor oil, which is a renewable, natural material that is a practical alternative for the replacement of traditional polyurethane foams. Due to its molecular structure, which contains polyester segments derived from vegetable oil, the polymeric surface is susceptible to microorganism attack. This study tested the biological degrading agent that was in contact with the microorganisms resulting from microbiological grease degrading agents, when foam was inoculated. Solid-media agar-plate tests were conducted for their potential to evaluate the biodegradation of polymeric particles by specific strains of microorganisms during 216 hours. The growth rate was defined. This technique provides a way of distinguishing the degradation abilities of microorganisms from the degradability of materials

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Study of the biodegradation of a polymer derived from castor oil by scanning electron microscopy, thermogravimetry and infrared spectroscopy

Cited by 46 publications

References 2 publications

Polyurethane derived from Ricinus Communis as graft for bone defect treatments

Polyurethane derived from Ricinus Communis as graft for bone defect treatments

Síntesis y caracterización de adhesivos reposicionables de poliuretano dispersos en agua, obtenidos a partir de aceite de castor maleinizado

Biodegradation of polyurethane derived from castor oil

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