Thermal properties in cured natural rubber/styrene butadiene rubber blends

Goyanes, Silvia; López, Cecilia C.; Rubiolo, G.H.; Quasso, F.; Marzocca, A. J.

doi:10.1016/j.eurpolymj.2008.02.016

Cited by 44 publications

(42 citation statements)

References 19 publications

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“…Optimum time cure t 100 (MDR2000, 433 K), density, and T g of the compounds obtained by DSC [6] and PALS. In the case of NR75-SBR25 and NR50-SBR50 blends, in the DSC scans two values of T g were detected [6]. The bending temperatures T b obtained from Fig.…”

Section: Resultsmentioning

confidence: 99%

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Temperature dependence on free volume in cured natural rubber and styrene-butadiene rubber blends

et al. 2011

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A systematic study on the evolution of free volume as a function of the temperature in vulcanized at 433 K natural rubber (NR) and styrene butadiene rubber (SBR) in 25-75, 50-50, 75-25 NR-SBR (percent content of pure NR and SBR, respectively) blends was studied by positron annihilation lifetime spectroscopy. All samples were prepared with sulfur and TBBS (n-t-butyl-2-benzothiazole sulfenamide) as accelerator. The glass transition temperatures of the samples studied were determined by differential scanning calorimetry (DSC) and from lifetime data. In general, a sigmoidal-like complex behavior of the long-lived lifetime component, linked to the nanohole free volume, as a function of the temperature was found. For SBR, the slope of the ortho-positronium lifetime against temperature curves could be well-fitted using a linear function. For blends and also for NR, two different linear functions were necessary. This last behavior is explained in terms of the supercooled process involving a reconfiguration of the elastomeric chains. In the case of blends, the state of cure of NR and SBR in each NR-SBR sample was also taken into account in the discussion of the results obtained. Besides, thermal expansion coefficients of the free volumes in the transition and glassy region of all compounds were estimated. The differences observed in the values of this parameter are discussed by taking into account the morphology and formulation of each blend, the crosslink densities, and the role of the interphases formed between both NR and SBR elastomers.

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Section: Resultsmentioning

confidence: 99%

“…On the other hand, Marzocca et al [6] have used calorimetric tests and diffusivity measurements to discuss the thermal properties of the same blends on the basis of the structure formed during the vulcanization process. To this aim, the analysis was made by taking into account the crosslink density of each phase.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence on free volume in cured natural rubber and styrene-butadiene rubber blends

et al. 2011

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“…The torques (minimum, and maximum), the scorch time (t s2 ), and optimum cure time (t c90 ) were determined from the rheograph. The ODR torque and cure rate index, CRI, (which is a measure of the rate of the crosslinking [4]), were calculated using Eqs. (1) and (2), respectively:…”

Section: Methodsmentioning

confidence: 99%

“…To obtain better end-use properties, rubber macromolecules are subjected to vulcanization using different type of accelerators [3]. The accelerator that is absolutely safe at processing temperature and also capable of fast cure can be considered ideal [4]. Binary accelerator combinations can give faster cure rates in rubber vulcanization systems.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Accelerators on Curing Characteristics and Properties of Natural Rubber/Chlorosulphonated Polyethylene Rubber Blend

Marković¹,

Radovanović

Marinović‐Cincović³

et al. 2009

Materials and Manufacturing Processes

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The aim of this work was to determine the influence of accelerator type on curing behavior and properties of sulphur vulcanized rubber blend based on natural rubber (NR) and chlorosulphonated polyethylene (CSM). In NR/CSM compounds filled with carbon black three types of accelerator were used: N-cyclohexylbenzothiazylsulphenamide (CBS), tetramethylthiuram disulphide (TMTD), and 2-mercaptobenzothiazol (MBT). The curing characteristics were estimated using oscillating disk rheometer. The results revealed that the accelerator type not only affects the cure characteristics, but also has great influence on the mechanical properties of obtained elastomers. It was determined that the tensile strength of rubber blends cured in the presence of TMTD was relatively high.

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“…The physical properties of polymer blends depend on the morphology, dispersion and stiffness of each component in the final properties of the blends (Goyanes et al 2008). However, blending of two polymers leads to immiscibility and third component are required such as compatibilizer to achieve the desired properties of the final product.…”

Section: Introductionmentioning

confidence: 99%

ENR-50 Compatibilized Natural Rubber/Recycled Acrylonitrile-Butadiene Rubber Blends

Ahmad¹,

Ismail²,

Rashid³

2015

JSM

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Thermal properties in cured natural rubber/styrene butadiene rubber blends

Cited by 44 publications

References 19 publications

Temperature dependence on free volume in cured natural rubber and styrene-butadiene rubber blends

Temperature dependence on free volume in cured natural rubber and styrene-butadiene rubber blends

The Effect of Accelerators on Curing Characteristics and Properties of Natural Rubber/Chlorosulphonated Polyethylene Rubber Blend

ENR-50 Compatibilized Natural Rubber/Recycled Acrylonitrile-Butadiene Rubber Blends

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