Rheological Behavior and Processing of Unvulcanized Rubber

White, James L.

doi:10.1016/b978-0-08-051667-7.50011-1

Cited by 4 publications

(3 citation statements)

References 188 publications

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“…Comúnmente se emplean tres tipos de mezcladores de caucho: molinos abiertos de dos rodillos, mezcladores internos tipo Banbury, y mezcladores internos miniatura. Las velocidades de mezclado y la dispersión de los ingredientes en el compuesto de caucho pueden ser diferentes de acuerdo al equipo de mezclado empleado (Dick, 2011;WHITE, 1994).…”

Section: La Matriz De Caucho Naturalunclassified

Efecto del sistema de vulcanización en la red entrecruzada y en la reacción química de vulcanización del caucho natural

Yepes

Restrepo

Vásquez

et al. 2018

reveia

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RESUMENSe presenta una revisión sobre el efecto del sistema de vulcanización en la estructura formada durante la reacción de vulcanización, en la cinética de la reacción y en las propiedades de formulaciones que emplean caucho natural. Se encontró que aún existen aspectos por investigar dada la variedad de acelerantes, proporciones acelerante/azufre, tipos de caucho natural y formulaciones que emplean caucho natural. La mayor parte de la literatura evalúa la reacción de vulcanización mediante reometría de vulcanización y calorimetría diferencial de barrido (DSC), pero estas técnicas no permiten identificar el tipo de enlaces sulfídicos formados ni la densidad de enlaces entrecruzados. La temática es de gran interés científico e industrial pues el caucho natural es el caucho más comercializado a nivel mundial, y su vulcanización se realiza en la gran mayoría de las formulaciones empleando azufre como agente entrecruzante. PALABRAS CLAVES:Caucho natural, sistema de vulcanización, reacción de vulcanización, red entrecruzada, agente vulcanizante, acelerantes Revista EIA, ISSN 1794-1237 / Año XIV / Volumen 14 / Edición N.28 / Julio-Diciembre 2017 / pp. 99-115 Publicación semestral de carácter técnico-científico / Universidad EIA, Envigado (Colombia)

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Section: La Matriz De Caucho Naturalunclassified

Efecto del sistema de vulcanización en la red entrecruzada y en la reacción química de vulcanización del caucho natural

Yepes

Restrepo

Vásquez

et al. 2018

reveia

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“…Later, Lehman [8] described a coextrusion process for joining tire tread and side wall rubber together. Companies, such as the U.S. Rubber Company, B.F. Goodrich Company, Goodyear Tire and Rubber Company, and Bridgestone Tire Company, all followed suit in developing novel concepts to join several unvulcanized rubber materials for the manufacturing of rubber goods [9].…”

Section: Introductionmentioning

confidence: 99%

Multilayer coextrusion of rubber compounds

Harris

Carson

Gadley

et al. 2015

Polymer Engineering & Sci

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This research work presents the first continuous multilayer coextrusion system for high viscosity elastomeric materials. Three unvulcanized rubber materials were chosen to validate the system: two butyl rubbers and a polyisoprene. The elastomers were characterized under oscillatory shear and the results used to perform computational flow simulations to investigate the effect of geometry on the flow path and flow rate. Successful extrudates of 8 and 32 layers were extruded at two different throughput rates for rheologically matched and rheologically mismatched material pairs. The results show good layering performance for both systems with little existence of viscous encapsulation and acceptable pressure drops. Computational and experimental results both show a nonuniform layer thickness distribution due to the geometric design of the layer multiplier extrusion dies, which were designed to minimize pressure drop in the system. This nonuniformity decreases with increasing number of layers. POLYM. ENG. SCI., 55:1520-1527, 2015

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“…It is such an essential ingredient in rubber tires that they utilize much of the polybutadiene manufactured worldwide. Additional product uses include toughened plastics, gaskets, shock absorbers, shoe soles, and golf balls [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

Simulating Stress–Strain Behavior by Using Individual Chains: Uniaxial Deformation of Amorphous Cis- and Trans-1,4-Polybutadiene

2023

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This work develops a probability-based numerical method for quantifying mechanical properties of non-Gaussian chains subject to uniaxial deformation, with the intention of being able to incorporate polymer–polymer and polymer–filler interactions. The numerical method arises from a probabilistic approach for evaluating the elastic free energy change of chain end-to-end vectors under deformation. The elastic free energy change, force, and stress computed by applying the numerical method to uniaxial deformation of an ensemble of Gaussian chains were in excellent agreement with analytical solutions that were obtained with a Gaussian chain model. Next, the method was applied to configurations of cis- and trans-1,4-polybutadiene chains of various molecular weights that were generated under unperturbed conditions over a range of temperatures with a Rotational Isomeric State (RIS) approach in previous work (Polymer 2015, 62, 129–138). Forces and stresses increased with deformation, and further dependences on chain molecular weight and temperature were confirmed. Compression forces normal to the imposed deformation were much larger than tension forces on chains. Smaller molecular weight chains represent the equivalent of a much more tightly cross-linked network, resulting in greater moduli than larger chains. Young’s moduli computed from the coarse-grained numerical model were in good agreement with experimental results.

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Rheological Behavior and Processing of Unvulcanized Rubber

Cited by 4 publications

References 188 publications

Efecto del sistema de vulcanización en la red entrecruzada y en la reacción química de vulcanización del caucho natural

Efecto del sistema de vulcanización en la red entrecruzada y en la reacción química de vulcanización del caucho natural

Multilayer coextrusion of rubber compounds

Simulating Stress–Strain Behavior by Using Individual Chains: Uniaxial Deformation of Amorphous Cis- and Trans-1,4-Polybutadiene

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