Preparation and Properties of Polyurethanes based on Castor Oil Chemically Modified with Yucca Starch Glycoside

Valero, Manuel F.; Pulido, Jorge E.; Hernández, Juan Carlos; Posada, J. A.; Ramírez, Álvaro; Cheng, Zhengdong

doi:10.1177/0095244308091785

Cited by 24 publications

(17 citation statements)

References 13 publications

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“…El contenido residual de glicerol después de la reacción se separó por destilación al vacío a (110 ± 5) °C y (125 ± 5) mbar. El glucósido de glicerol (GG) se mezcló con los polioles derivados del aceite de ricino en cantidades de 5 y 10% (peso de glucósido/ peso de poliol) con una cantidad de catalizador (óxido de plomo) de 0.05% durante 2 horas a (210 ± 5) °C, bajo atmósfera de nitrógeno, en un reactor similar usado para la transesterificación del aceite de ricino con pentaeritritol [9] . hinchamiento medio de los materiales obtenidos en tetracloruro de carbono, acetona y etanol.…”

Section: Métodos De Síntesisunclassified

[No Title Available]

et al. 2011

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Resumen: El aceite de ricino se modificó por transesterificación con pentaeritritol. Paralelamente, se utilizó la reacción de glucosilación con glicerol para dividir el almidón en unidades monosacáridos. El glucósido obtenido reaccionó por transesterificación con el aceite modificado por transesterificación con pentaeritritol. Se determinó el índice de hidroxilo de los poliol-glucósidos en función del contenido de pentaeritritol y almidón utilizados en la síntesis. Se sintetizaron redes interpenetradas de polímero de manera simultánea (SINs) con diferentes relaciones en peso poliuretano/PMMA de 100/0, 90/10, 80/20, 70/30, 60/40 y 50/50. Para la síntesis de la red de poliuretano (PU) se utilizaron los poliol-glucósidos y diisocianato de isoforona (IPDI) o con una relación NCO/OH = 1 y para la síntesis de la red de polimetilmetacrilato (PMMA) se utilizó peróxido de benzoílo como agente iniciador y dimetacrilato de etilenglicol como agente entrecruzante. Los SINs se caracterizaron por sus propiedades fisicomecánicas como resistencia al ataque químico, dureza, resistencia a la tensión y elongación de ruptura. La estabilidad térmica de los SINs se determinó usando análisis termogravimétrico (TGA). La morfología de superficie se determinó usando microscopia electrónica de barrido (SEM) y mostró una morfología de dos fases para todos los SINs. Palabras-clave: Aceite de ricino, almidón, glucosilación, redes interpenetradas de polímero, polimetilmetacrilato (PMMA). Physico-mechanical, Thermal and Morphological Behaviour of Simultaneous Interpenetrating Polymer Networks Based on Polyurethane from Modified Castor Oiland Starch/Poly(Methyl Methacrylate)Abstract: Castor oil was modified by transesterification with pentaerithritol. In a parallel step, starch was divided into monosaccharide units by glycosylation in order to obtain products with high hydroxyl content. The values of hydroxyl index were measured according to the content of pentaerithritol and starch used in the synthesis. Novel simultaneous interpenetrating polymer networks (SINs) of polyurethane (PU) and poly(methyl methacrylate) (PMMA) in different weight ratios of 100/0, 90/10, 80/20, 70/30, 60/40 and 50/50 were prepared based on polyol-glucosides. The polyurethane network was created by reacting the poliol-glucosides with isophorone diisocyanate maintaining a molar ratio NCO/OH = 1. The PMMA network was synthesized using benzoyl peroxide as initiator and ethylene glycol dimethacrylate as the crosslinker. The SINs were characterized in their mechanical properties, such as Shore A hardness, tensile strength and elongation at break. Thermal stability of SINs was measured using thermogravimetric analysis (TGA). Surface morphology measured using scanning electron microscope (SEM) showed two-phase morphology for all the SINs. SINs based on polyurethane from castor oil modified and poly(methyl methacrylate) show limited compatibility at low concentrations of PMMA, but are totally incompatible at higher concentrations of PMMA.

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Section: Métodos De Síntesisunclassified

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“…[10] Polyols prepared from the transesterification of castor oil by pentaerythritol have been further reacted with glycosides from starch to give polyol-glycosides with a high hydroxyl content. [43] Reaction of these polyol-glycosides with isophorone diisocyanate (IPDI) resulted in polyurethanes with excellent chemical resistance, hardness, and tensile strength. Furthermore, all of the materials show a uniform polyurethane phase, which indicates that the starch glycosides are chemically incorporated.…”

Section: Vegetable Oil-based Ab Monomersmentioning

confidence: 99%

“…Furthermore, all of the materials show a uniform polyurethane phase, which indicates that the starch glycosides are chemically incorporated. [43] Simultaneous interpenetrating networks of polyurethanes from pentaerythritol-modified castor oil and polystyrene (PS) using divinylbenzene as a crosslinker have been successfully prepared.…”

Section: Vegetable Oil-based Ab Monomersmentioning

confidence: 99%

Recent Advances in Vegetable Oil‐Based Polyurethanes

2011

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Polyurethanes are among the most versatile polymers because of the wide range of monomers, particularly diols or polyols, that can be utilized in their synthesis. This Review focuses on the most recent advances made in the production of polyurethane materials from vegetable oils. Over the past several years, increasing attention has been given to the use of vegetable oils as feedstocks for polymeric materials, because they tend to be very inexpensive and available in large quantities. Using various procedures, a very broad range of polyols or diols and in some cases, poly- or diisocyanates, can be obtained from vegetable oils. The wide range of vegetable oil-based monomers leads to a wide variety of polyurethane materials, from flexible foams to ductile and rigid plastics. The thermal and mechanical properties of these vegetable oil-based polyurethanes are often comparable to or even better than those prepared from petroleum and are suitable for applications in various industries.

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“…The natural abundance of castor, combined with the inherent proper functionality of the oil, has led to the widespread use of castor oil in the polyurethanes industry as a low-cost component to reduce the overall price of flexible foam formulations [57], and to impart improved moisture resistance and weatherability to coatings and elastomers [58][59][60][61][62][63]. Much work has been done on the incorporation of castor oil into polyurethane formulations, including flexible foams [64], rigid foams [65], and elastomers [66].…”

Section: Castor Oilmentioning

confidence: 99%

Polyurethanes from Renewable Resources

Babb

2011

Synthetic Biodegradable Polymers

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Factors such as the price and availability of petroleum, and societal concerns over global climate change continue to create increased market pressure on the industrial and domestic use of petrochemicals. Many industrial suppliers of basic chemicals are looking to alternative, sustainable sources of raw materials. In the polyurethanes industry, suppliers of polyols have been utilizing naturally sourced raw materials for many years in conjunction with petrochemical raw materials. Recently, the polyurethanes industry has moved toward greater replacement of petrochemical content with renewable resources. The principle sources of renewable feedstock are the triglyceride oils found in seeds such as soybean, canola, and sunflower. New, non-food sources of triglycerides such as Lesquerella and Vernonia, and even aquatic sources such as algae, are beginning to draw attention, even as old sources such as castor oil are getting a new look.

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Preparation and Properties of Polyurethanes based on Castor Oil Chemically Modified with Yucca Starch Glycoside

Cited by 24 publications

References 13 publications

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Recent Advances in Vegetable Oil‐Based Polyurethanes

Polyurethanes from Renewable Resources

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