The Current Status of Interpenetrating Polymer Networks

Sperling, L. H.; Mishra, V.

doi:10.1002/(sici)1099-1581(199604)7:4<197::aid-pat514>3.0.co;2-4

Cited by 262 publications

(212 citation statements)

References 8 publications

(9 reference statements)

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“…Desde el punto de vista de la innovación, la estructura química del aceite de higuerilla es de gran interés, porque permite un gran número de reacciones y productos derivados. 1 El uso del aceite de higuerilla en la síntesis de elastómeros de poliuretano e IPNs ha sido reportado en numerosas investigaciones. [2][3][4] Estos estudios muestran que se puede obtener un amplio rango de propiedades físicas y mecánicas dependiendo del contenido del poliol y el diisocianato.…”

Section: Introductionunclassified

Sintesis de poliuretanos a partir de polioles obtenidos a partir del aceite de higuerilla modificado por transesterificación con pentaeritritol

Valero¹,

Pulido²,

Ramírez³

et al. 2008

Quím. Nova

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Recebido em 24/4/08; aceito em 20/6/08; publicado na web em 10/11/08 POLYURETHANES SINTETIZED OF POLYOLS OBTAINED FROM CASTOR OIL MODIFIED BY TRANSESTERIFICATION WITH PENTAERYTHRITOL. Castor oil was reacted by transesterification with various percentages in mass of pentaerythritol to obtain different esters of pentaerythritol. Alternatively, glycerol was also used instead of pentaerythritol for the same reaction in order to establish comparative reference products. The products of the reactions were characterized by matrix-assisted laser desorption/ ionization time-of-flight mass spectroscopy in order to detect and quantify (in terms of the molecular mass and structural information) the components of the products obtained. Analysis for hydroxyl value, acid value, viscosity and specific gravity were used to complete the characterization of the polyols obtained and also of the original castor oil. The polymer characterization was accomplished by tensile stress-strain tests, Shore A hardness, thermogravimetric analysis and chemical resistance to solvents.Keywords: castor oil transesterification; MALDI TOF mass spectroscopy; polyurethanes. introducciónEl aceite de higuerilla se extrae de la semilla de la planta "Ricinus communis" y se caracteriza por ser uno de los pocos aceites vegetales cuya composición es casi la de un solo componente, puesto que el 90% corresponde al triglicérido del ácido ricinoléico. Desde el punto de vista de la innovación, la estructura química del aceite de higuerilla es de gran interés, porque permite un gran número de reacciones y productos derivados. 1El uso del aceite de higuerilla en la síntesis de elastómeros de poliuretano e IPNs ha sido reportado en numerosas investigaciones. 2-4Estos estudios muestran que se puede obtener un amplio rango de propiedades físicas y mecánicas dependiendo del contenido del poliol y el diisocianato. La composición y la relación NCO/OH de los segmentos del poliuretano afectan la estructura, organización y flexibilidad del polímero, y por consiguiente la morfología y las propiedades mecánicas. Sin embargo, los materiales obtenidos a partir del aceite de higuerilla presentan propiedades como bajo módulo de Young, baja resistencia al rasgado y también baja resistencia a tratamientos a alta temperatura. 5-7Una forma de modificar estas propiedades es la transesterificación del aceite con alcoholes polihidroxílicos para introducir grupos hidroxílicos reactivos. Al aumentar estos grupos se incrementa el grado de entrecruzamiento del poliuretano, por lo que las propiedades del poliuretano cambian. El término transesterificación se usa generalmente para describir una clase de reacciones orgánicas donde un éster es transformado en otro a través del intercambio del grupo alcoxi.8 En la transesterificación de aceites vegetales, un triglicérido reacciona con un alcohol, en presencia de un ácido o base fuerte, produciendo una mezcla de ésteres alquílicos de ácidos grasos y glicerol. El proceso total es una secuencia de 3 reacciones consecutivas irreversibles en la cual...

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Section: Introductionunclassified

Sintesis de poliuretanos a partir de polioles obtenidos a partir del aceite de higuerilla modificado por transesterificación con pentaeritritol

Valero¹,

Pulido²,

Ramírez³

et al. 2008

Quím. Nova

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“…Interpenetrating polymer networks (IPNs) introduced in the early 1960s, were successful in creating polymeric nano-scale blends having new extraordinary properties as reviewed elsewhere [6,7]. The importance of IPN synthesis has been recognized in engineering literature, patents and commercialized products since 1951 [8,9]. The concept of in situ polymerization within and through the structure of another polymer network as well as stabilizing this multiphase system was based on creating interpenetrating (i.e.…”

Section: Introductionmentioning

confidence: 99%

Formation and thermal stability of BMI-based interpenetrating polymers for gas separation membranes

Kurdi¹,

Kumar²

2006

Journal of Membrane Science

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“…Different monomers or different polymer chains with appropriate cross-linking agents are polymerized together. The advantage of this process is that the two components are cross-linked by reactions and will not interfere with one another, 37 such as when a condensation reaction occurs polymerizing one network while the other network is formed by a free radical reaction. Figure 4 shows a schematic mechanism of IPNs.…”

Section: Chemical Methodsmentioning

confidence: 99%

Water swellable rubber composites: An update review from preparation to properties

Dehbari

Tang

2015

J of Applied Polymer Sci

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In recent years, water swellable rubber composites have been the subject of many scientific and research investigations as well as many industrial programs. Here, we present an updated overview of the developments in the area of water swellable rubber composites with different kinds of fillers, compatibilizers, and cross-linked agents, in terms of their manufacturing methods, synthesis, chemical, physical, and mechanical properties. Several critical issues and suggestions for future work are detailed, underscoring the roles of material scientists and manufacturing engineers in the bright future of this new material through value addition to enhance its usage and fields of application.

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The Current Status of Interpenetrating Polymer Networks

Cited by 262 publications

References 8 publications

Sintesis de poliuretanos a partir de polioles obtenidos a partir del aceite de higuerilla modificado por transesterificación con pentaeritritol

Sintesis de poliuretanos a partir de polioles obtenidos a partir del aceite de higuerilla modificado por transesterificación con pentaeritritol

Formation and thermal stability of BMI-based interpenetrating polymers for gas separation membranes

Water swellable rubber composites: An update review from preparation to properties

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