Morphology and properties of thermoplastic polyurethanes with dangling chains in ricinoleate-based soft segments

Xu, Yijin; Petrovìć, Zoran S.; Das, Sudipto; Wilkes, Garth L.

doi:10.1016/j.polymer.2008.07.027

Cited by 223 publications

(176 citation statements)

References 39 publications

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“…The TSPUs showed some branching-like structure and some spheres located randomly with clear whitish speckled protruding from the surface. Xu et al 2008 25 was reported to found a protruding spherulitic-like structure in his study of castor oil based polyurethane cast film which he believed it was attributed to the hard segment contents. From my observation in both TPPUs and TSPUs for palm oil and soya oil, they demonstrate several similarities with the surface morphology in terms of whitish speckled protruding from the polymer surface.…”

Section: Structure-property Studies Of Thermoplastic and Thermosettinmentioning

confidence: 96%

“…8 and 9 are usually characterized for determining phase separation between the soft and hard segments 29 . The DSC thermograms usually undergo three typical transitions; the glass transition of the soft segment, the glass transition of the amorphous portion of hard segments and melting of the hard segments if the hard segment symmetry exists along with suitable thermal history to allow crystallization to occur 25 .…”

Section: Thermal Propertiesmentioning

confidence: 99%

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Structure-Property Studies of Thermoplastic and Thermosetting Polyurethanes Using Palm and Soya Oils-Based Polyols

Mohammed¹,

Al-Mulla²,

Kadar³

et al. 2013

J. Oleo Sci.

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Section: Structure-property Studies Of Thermoplastic and Thermosettinmentioning

confidence: 96%

Section: Thermal Propertiesmentioning

confidence: 99%

Structure-Property Studies of Thermoplastic and Thermosetting Polyurethanes Using Palm and Soya Oils-Based Polyols

Mohammed¹,

Al-Mulla²,

Kadar³

et al. 2013

J. Oleo Sci.

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“…The decomposition, both of the polymers based on HDI and MDI, occurred in three stages. The first stage can be ascribed to simultaneous decomposition of carbonate, urethane and sulfide linkages; the second was associated with the aromatic content in the polymer, whereas the last stage was connected with the oxidation of the char formed in the previous stages 13 . All the synthesized TPUs exhibited a relatively good thermal stability.…”

Section: Thermal Propertiesmentioning

confidence: 99%

New thermoplastic poly(carbonate-urethane) elastomers

Kultys

Rogulska

2011

Polish Journal of Chemical Technology

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Two series of novel thermoplastic poly(carbonate-urethane) elastomers, with different hard-segment content (30 -60 wt %), were synthesized by melt polymerization from poly(hexane-1,6-diyl carbonate) diol of = 2000 as a soft segment, 4,4'-diphenylmethane diisocyanate (MDI) or hexane-1,6-diyl diisocyanate (HDI) and 6,6'-[methylenebis(1,4-phenylenemethylenethio)]dihexan-1-ol as a chain extender. The structure and basic properties of the polymers were examined by Fourier transform infrared spectroscopy, X-ray diffraction analysis, atomic force microscopy, differential scanning calorimetry, thermogravimetric analysis, Shore hardness and tensile tests. The resulting TPUs were colorless polymers, showing almost amorphous structures. The MDI-based TPUs showed higher tensile strengths (up to 21.3 MPa vs. 15.8 MPa) and elongations at break (up to 550% vs. 425%), but poorer low-temperature properties than the HDI-based analogs.

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Section: Introductionunclassified

“…En los aceites vegetales se han realizado modificaciones químicas en los grupos éster y dobles enlaces, para obtener una amplia gama de biopolímeros termoestables y entrecruzados [1] . El aceite de castor se ha utilizado en la obtención de poliuretanos para aplicaciones como espumas y adhesivos [2][3][4] , pero pocos estudios muestran su utilización en aplicaciones termoplásticas, Xu et al [5] estudió las relaciones estructurapropiedad de poliuretanos segmentados basados en poliricinoleato diol, el cual fue obtenido por transesterificación de metil ricinoleato con etilenglicol, los TPU obtenidos tienen propiedades que permiten ser competitivos con los petroquímicos.Desde los años 40 los termoplásticos de poliuretano (TPU) están disponibles comercialmente y se utilizan como materiales de ingeniería y reconocidos por su excelente resistencia mecánica, abrasión, resistencia a solventes y alta resiliencia [6] . Son materiales de morfología segmentada en dos fases: segmentos suaves o flexibles correspondientes con el macropoliol y segmentos duros o rígidos provenientes del isocianato y del extensor de cadena de bajo peso molecular.…”

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Síntesis de poli ácido láctico y poli ricinoleato empleando calentamiento por microondas y su utilización en la producción de termoplasticos de poliuretano

2011

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Resumen: En este trabajo se realiza la síntesis de poliuretano termoplástico (TPU) utilizando oligómeros sintetizados a partir de ácido DL Láctico y ácido ricinoléico. Estos polioles fueron obtenidos desde fuentes renovables, mediante la policondensación de los monómeros sin catalizador. Se evalúo el efecto de las microondas en las reacciones, donde se encuentraron efectos no térmicos que disminuyen la energía de activación y aumentan la constante de velocidad, en una cinética de tercer orden; el seguimiento y la caracterización de los productos intermedios se realiza mediante la cuantificación de valor ácido por titulación (ASTM D4662 -03) y número de hidroxilos (ASTM D4274 -05). Los termoplásticos obtenidos se caracterizan mediante las siguientes pruebas: resistencia tensil y % elongación (ASTM D882-97), análisis de calorimetría diferencial de barrido (DSC), espectroscopía infrarroja (IR) y microscopía de fuerza atómica (AFM). Los TPU se obtuvieron con un porcentaje de segmentos suaves del 50%, todos presentan morfología segmentada y segregación de fases. Las formulaciones con poli(DL ácido Láctico) y Difenilmetanodiisocianato (MDI) presentan la mayor rigidez y temperatura de transición vítrea (Tg). Palabras-claves: Poliuretano termoplástico, poli(DL ácido Láctico), poliricinoleato. Synthesis of Poly Lactic Acid and Poly Ricinoleate Using Microwave Heating and Their Use in the Production of Polyurethane ThermoplasticAbstract: In this paper we report on the synthesis of thermoplastic polyurethane (TPU) using oligomers synthesized from DL Lactic acid and ricinoleic acid. These polyols were obtained from renewable sources by polycondensation of monomers without catalysts. The effect of microwaves on the reactions was evaluated, where non-thermal effects were found to lower the activation energy and increase the rate constant in a third-order kinetics. The monitoring and characterization of intermediate products was done by quantification of acid value by titration (ASTM D4662 -03) and hydroxyl number (ASTM D4274 -05). Thermoplastics obtained are characterized by the following tests: tensile strength and elongation percentage (ASTM D882-97), analysis of differential scanning calorimetry (DSC), infrared spectroscopy (IR) and atomic force microscopy (AFM). TPU was obtained with a percentage of 50% soft segments, all have segmented morphology and segregation of phases. The formulations with poly(DL lactic acid) and Methylene diphenyl diisocyanate (MDI) have the highest stiffness and glass transition temperature (Tg). Keywords: Thermoplastic polyurethane, poly(DL lactic acid), polyricinoleate. IntroducciónLa utilización de productos naturales como aceites vegetales y grasas ha atraído la atención de científicos y de la industria en los últimos años, debido a consideraciones ambientales. Estas materias primas son sostenibles, renovables, y lo más importante, biodegradables. En los aceites vegetales se han realizado modificaciones químicas en los grupos éster y dobles enlaces, para obtener una amplia gama de biopolímero...

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Morphology and properties of thermoplastic polyurethanes with dangling chains in ricinoleate-based soft segments

Cited by 223 publications

References 39 publications

Structure-Property Studies of Thermoplastic and Thermosetting Polyurethanes Using Palm and Soya Oils-Based Polyols

Structure-Property Studies of Thermoplastic and Thermosetting Polyurethanes Using Palm and Soya Oils-Based Polyols

New thermoplastic poly(carbonate-urethane) elastomers

Síntesis de poli ácido láctico y poli ricinoleato empleando calentamiento por microondas y su utilización en la producción de termoplasticos de poliuretano

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