Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Tavares, Lara Basílio; Boas, C. V.; Schleder, Gabriel R.; Nacas, Amanda Martins; Rosa, Derval dos Santos; Santos, Demétrio Jackson dos

doi:10.3144/expresspolymlett.2016.86

Cited by 114 publications

(94 citation statements)

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“…In the last few years, castor oil has been used widely to prepare polyurethane products, including rigid foams, flexible foams, elastomers, coatings, and adhesives . As castor oil and its derived polyols bear long hydrophobic hydrocarbon chains, they can increase the hydrophobicity of soft segment (SS) and enhance the water resistance of the as‐prepared polyurethane products.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Zhang

Yao

Chen

et al. 2018

J of Applied Polymer Sci

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In this contribution, castor oil polyols with functionality of f = 2.7 and f = 2 are used as soft segments (SS) for synthesizing polyurethane elastomers (PUEs) without addition of petroleum‐based polyol. The effect of molar ratio of castor oil polyols on structure and properties of PUEs has been investigated by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, X‐ray diffraction, tensile, swelling, and water absorption tests. The results reveal that hydrogen bonding mainly exists in hard segments (HSs) and weakens with decreasing the molar percentage of castor oil polyol (f = 2.7) in SS. T g of SS decreases while T g of HS remains constant as molar percentage of castor oil polyol (f = 2.7) decreased. The initial degradation temperatures (T5%) are above 300 °C and independent of the molar ratio of castor oil polyols. However, the temperature at 50% weight loss (T50%) decreases significantly as molar percentage of castor oil polyol (f = 2.7) decreased. Moreover, PUEs exhibit very low water absorption rate, <1%, after immersing in water for 140 h at room temperature. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47309.

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Zhang

Yao

Chen

et al. 2018

J of Applied Polymer Sci

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“…Addition of lignin in the application of polyurethane not only is an effective method in using renewable biomass energy, but also enhances properties of polyurethane like excellent mechanical, heat-resistant and compression performance and aging-resistant performance [52]. The use of biobased raw materials can significantly contribute to sustainable development due to bio-degradability and low toxicity of the resulting products [53] [54]. At low concentration of lignin, the PU materials can be easily obtained, whereas it is difficult to get lignin-derived PU materials with high lignin concentration.…”

Section: Resultsmentioning

confidence: 99%

Lignin-Polyurethane Based Biodegradable Foam

Gadhave¹,

Mahanwar²,

Gadekar³

2018

OJPChem

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Natural sources like starch and lignin used during manufacturing of polyurethane (PU) foam have been used extensively from last decades and replaced petro-chemical based PU foam due to their lower environmental impact, easy availability, low cost and biodegradability. Bio-renewable sources, such as lignin which is an abundant, underutilized component of cellulosic biomass, constitute a rich source of polyol which are being considered as polyol for the production of "eco-friendly and bio-degradable" PU foam. Lignin was mainly used for production of high fungal degradable polyurethane foams, followed by elastomers as well as wood adhesives. This review paper will focus on the progress of research in lignin based polyurethane materials for foam application.

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“…28 El Pu sin tratar se caracteriza por presentar tres pérdidas en peso. La primera pérdida en peso, por debajo de los 100 °C se relaciona con la pérdida del agua contenida dentro del polímero y otros compuestos volátiles de bajo peso molecular empleados durante la síntesis del polímero.…”

Section: Análisis Termogravimétricos (Tga) Y De Infrarrojo (Ftir)unclassified

“…La primera pérdida en peso, por debajo de los 100 °C se relaciona con la pérdida del agua contenida dentro del polímero y otros compuestos volátiles de bajo peso molecular empleados durante la síntesis del polímero. La segunda perdida en peso, más gradual, a los 250 °C se relaciona con la descomposición térmica de las cadenas poliméricas y después de 320 °C y hasta casi 400 °C se descompone el segmento suave y luego el rígido del polímero 28 En el caso de las muestras de PU sometidas a la acción del hongo Trichoderma DIA-T se observa un comportamiento similar, una primera degradación entre los 100-300 °C relacionada con los compuestos volátiles, tales como aditivos usados en la síntesis del poliuretano o componentes como biomasa, seguida de una segunda degradación entre 300-400 °C, correspondiente a la degradación de enlaces uretano y a 400-500 °C para enlaces éster. 18 El tratamiento con glucosa mostró un descenso apreciable en la temperatura a la cual el poliuretano se degrada desde el principio del análisis.…”

Section: Análisis Termogravimétricos (Tga) Y De Infrarrojo (Ftir)unclassified

“…Los resultados nos podrían indicar la ruptura parcial del enlace uretano debido a actividad ureasa previamente detectada, siendo estos cambios más pronunciados en el tratamiento con Trichoderma DIA-T y con Paecelomyces NK12, esto por la aparición de un "hombro" en la región de 1680 cm -1 que se ha relacionado con la degradación del enlace uretano. 30 Así mismo, según Tavares et al, 28 los enlaces N-H se encuentran en la región de 3300 cm -1 aproximadamente, y en la Figura 5 se puede observar que el ensachamiento de la dicha banda es menor para el caso del PU tratado con Trichoderma en presencia de glucosa, por lo que es posible suponer que el hongo utiliza el nitrógeno de la molécula del plástico para suplir sus necesidades de este elemento. Esto dejaría libres los grupos carbonilo del enlace uretano aumentando la señal en 1731 cm -1 como se puede ver en la figura.…”

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Fungal biodegradation of rigid polyurethane

et al. 2017

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FUNGAL BIODEGRADATION OF RIGID POLYURETHANE. Polyurethane (PU) is one of the most widely used polymer materials. This generates a serious environmental problem because of its poor biodegradability since most of the native microorganisms cannot use it as a source of nutrients. Several techniques involving mechanical and chemical processes have been used for its recovery and reuse; however, the problem of contamination has not been solved, and recently research has focused on developing strategies that use different microorganisms for the biodegradation of PU. In this work, the biodegradation and enzymatic capacity of three fungal strains were evaluated. Thermogravimetric and infrared spectrophotometry analyzes were used to evaluate the ability of the three fungal strains to biodegrade PU and also their enzymatic activities were studied. It was found that a strain of Trichoderma was able to modify the PU structure enough that the changes were detected by both TGA and FTIR. These changes can be caused by urease activity that breaks down carbon-nitrogen bonds in the structure because the signals suggesting the formation of carboxylic acids and decreasing corresponding to carbon-nitrogen bonds of the urethane bond are increased.Keywords: polyurethane; biodegradation; filamentous fungi. INTRODUCCIONEn el mundo, los polímeros son los principales responsables del deterioro del medio ambiente.1 Dentro de estos, los poliuretanos (PU) son ampliamente usados como materia prima en diversas industrias, desde muebles y automóviles, a aislamientos térmicos de barcos y materiales médicos.2 Son sintetizados a partir de polioles y poliisocianatos y se caracterizan por ser insolubles en agua.3 El problema principal radica en su acumulación y no biodegradación por parte de los microorganismos existentes, que no cuentan con estrategias de biodegradación contra esta estructura polimérica. 4 Cada año, más de 5 millones de toneladas de residuos que contienen diferentes plásticos y espumas de PU son generados en los Estados Unidos y Canadá, 3 por lo que la degradación del PU y el descubrimiento de microorganismos capaces de aprovecharlo como fuerte de carbono o nitrógeno, se ha convertido en un pilar dentro de la investigación científica hacia una química más verde. 5Los polímeros pueden ser sustratos potenciales para microorganismos quimioheterotrofos.6 Se han aislado tanto bacterias como hongos filamentosos capaces de degradar PU.7 Los géneros de hongos encontrados han sido Geomyces pannorum y Nectria sp, principalmente, además de Cylindrocladiella parva, Penicillium inflatum, Plectosphaerella cucumerin y P. inflatum, Alternaria, Penicillium venetum, Neonectria ramulariae y Penicillium viridicatum. Los poliurteanos están conformados por regiones C-C, C-N y C-O y poseen un enlace característico, el enlace uretano, similar al enlace peptídico y a la urea. La principal funcion del enlace uretano es unir cadenas orgánicas de polioles y poliisocianatos, para formar la unidad polimérica del poliuretano, la cual diferencia a cada poliuretano ...

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Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Cited by 114 publications

References 50 publications

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Synthesis and properties of polyurethane elastomers based on renewable castor oil polyols

Lignin-Polyurethane Based Biodegradable Foam

Fungal biodegradation of rigid polyurethane

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