Uso de DSC na determinação de parâmetros de vulcanização de látex de borracha natural

Peres, Augusto Cesar de Carvalho; Lopes, L.; Visconte, Leila L. Y.; Nunes, Regina C. R.

doi:10.1590/s0104-14282006000100013

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…The relation between the sulfur and the accelerator used define the vulcanization system as the conventional type. This system gives the material excellent mechanical properties, such as fatigue resistance, abrasion, deformation and scratch [20] .…”

Section: Rheometry Parametersmentioning

confidence: 99%

Sugarcane bagasse ash: new filler to natural rubber composite

et al. 2014

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Waste recycling has been the subject of numerous scientific researches regarding the environmental care. This paper reports the redirecting of sugarcane bagasse ash (SBA) as new filler to natural rubber (NR/SBA). The NR/ SBA composites were prepared using an opened cylinder mixer to incorporate the vulcanization agents and different proportions of residue (SBA). The ash contains about 70-90% of inorganic compounds, with silica (SiO 2 ) being the main compound. The SBA incorporation improved the mechanical properties of the vulcanized rubber. Based on these results, a new use is proposed for the agro-industry organic waste to be implemented in the rubber vulcanization process, aimed at improving the rubber physical properties as well as decreasing the prices of natural rubber composites.

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Section: Rheometry Parametersmentioning

confidence: 99%

Sugarcane bagasse ash: new filler to natural rubber composite

et al. 2014

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“…La medición mediante DSC no permite discriminar si los enlaces formados son elásticamente activos o no (Marzocca et al, 2004;Peres et al, 2006). El DSC permite además realizar seguimiento de la reacción de vulcanización de forma isotérmica o no isotérmi-ca, una versatilidad que es muy útil para establecer la cinética de vulcanización bajo diferentes ciclos térmi-cos, lo cual se aproxima mejor a la manera como se da la reacción en los procesos industriales.…”

Section: Reacción De Vulcanizaciónunclassified

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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“…LBM is a polyisoprene derivative, made of rubber latex ( Hevea brasiliensis ), a whitish secretion (also called “coagulated milky sap”) produced by the stem of the tree when it undergoes an incision in the bark, called “sangria.” This natural latex is composed of rubbery, nongummy hydrocarbon particles suspended in an aqueous serum phase, in which there is an occurrence of (on average) 36% hydrocarbons, 1.6% carbohydrates, 1.4% protein, 1% neutral lipids, 0.6% glycolipids plus phospholipids, 0.5% inorganic components, 58.5% water, and 0.4% other substances. Therefore, Hevea brasiliensis latex is a compound cytoplasmic system in which rubber particles and nonrubbery particles are dispersed in an aqueous cytosol phase [ 3 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Evidence in Practice of Tissue Healing with Latex Biomembrane: Integrative Review

Rosa

Fonseca

et al. 2019

Journal of Diabetes Research

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Wound healing is a perfectly coordinated cascade of cellular, molecular, and biochemical events which interact in tissue reconstitution. Chronic diseases such as pressure ulcers (PU) and diabetes mellitus (DM) are considered risk factors for wound healing. Patients with such diseases often have higher sepsis, infection, and complication rates, since they have revascularization inhibition and low growth factor expression. Thus, latex biomembrane (LBM), a biocompatible material, derived from the latex of the rubber tree (Hevea brasiliensis) appears to create tendencies as an angiogenic-inducing tissue healing agent and as biomaterial, resulting from its structural qualities and its low cost when compared to conventional treatments. Therefore, this work aims at summarizing the results, experiments, and scientific findings that certify or recommend the use of LBM as a new technique to be applied effectively in the treatment of wounds. An integrative review was held in the BIREME, LILACS, Burns, MEDLINE, PubMed, and SciELO databases, from 2000 to 2016, using the following descriptors: “healing,” “diabetes mellitus,” “wounds,” and “latex membrane.” As a result, 600 experiments (out of 612) presented satisfactory results; however, 33% of the cases received explicit recommendations, 11% required more studies on the subjects, and 1% was denied. On the other hand, half of the studies did not expressly endorse its use, despite presenting satisfactory results. The LBM was characterized as a good therapeutic alternative in cases of wounds, including chronic diseases, such as diabetes mellitus and PU, due to its relevant potential for wound healing stimulation, acceleration of cell tissue mending and revascularization, or the reestablishment of angiogenic functions (creation of new blood vessels). The LBM was also confirmed to be safe as a biocompatible material whose structural qualities (elasticity, adaptability, impermeability, and possibility of suture), devoid of toxicity, allowed interaction between tissues and presented no hypersensitivity inducer and no antimicrobial effect.

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Uso de DSC na determinação de parâmetros de vulcanização de látex de borracha natural

Cited by 8 publications

References 13 publications

Sugarcane bagasse ash: new filler to natural rubber composite

Sugarcane bagasse ash: new filler to natural rubber composite

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

Evidence in Practice of Tissue Healing with Latex Biomembrane: Integrative Review

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