Applications of a New Dynamic Mechanical Rheological Tester in Measuring Carbon Black and Oil Effects on Rubber Compound Properties

Dick, John S.; Pawlowski, Henry

doi:10.1177/009524439502700103

Cited by 13 publications

(14 citation statements)

References 6 publications

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“…Porém, o valor da viscosidade Mooney é obtido à baixa taxa de cisalhamento, e não detecta variações estruturais que afetam o processamento e desempenho final do composto, como é o caso do RPA. Neste equipamento, a distribuição de peso molecular, ramificação, razão entre comonômeros, são alguns exemplos que podem ser detectados [5,9] .…”

Section: Resultsunclassified

Propriedades Reológicas e Dinâmicas de Composições Não-Vulcanizadas de Borracha Natural com Celulose Regenerada

2002

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Neste trabalho, composições não-vulcanizadas de borracha natural (NR) com celulose regenerada (Cel II) foram preparadas por co-coagulação de misturas de látex natural e xantato de celulose. Foi estudada a influência da carga celulósica nas propriedades reológicas e dinâmicas dessas composições, para teores entre 0 e 30phr. As propriedades reológicas avaliadas foram os torques, elástico (S') e viscoso (S"), a tan delta e a viscosidade dinâmica real (h'). Para estes ensaios foram feitas varreduras de freqüência e arco, à temperatura constante. A viscosidade e a relaxação Mooney também foram estudadas. Os testes dinâmicos foram realizados à freqüência constante, sendo a tangente de perda e o módulo elástico (E') os parâmetros considerados. Os resultados mostraram uma excelente dispersão da carga celulósica na matriz borrachosa, e sua grande influência nas propriedades viscoelásticas da borracha natural sem, no entanto, modificar o perfil do comportamento reológico desta borracha.

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Section: Resultsunclassified

Propriedades Reológicas e Dinâmicas de Composições Não-Vulcanizadas de Borracha Natural com Celulose Regenerada

2002

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“…Generally, this behavior is exhibited for a polymer below a particular strain level called the critical strain. 4 Nonlinear viscoelasticity is observed when the ratio of stress to strain changes in a strain sweep, under constant conditions of temperature and frequency. Most industrial processing applications are in the nonlinear viscoleastic region for both raw rubber and compounded stocks.…”

Section: Figurementioning

confidence: 99%

“…11), differently from what is found in the literature. 4 Figure 12 presents the SЉ response from a high strain sweep applied to the investigated compositions. Viscous torque is higher than elastic torque (Fig.…”

Section: Figurementioning

confidence: 99%

“…2,3 The rubber process analyzer (RPA) 2000 rubber process is a new dynamic mechanical rheological tester designed to measure the dynamic properties of raw polymers, uncured compounds, and final cured compounds. 2,4 The RPA strains a sample in shear by oscillating the lower die sinusoidally. Oscillation frequency can be set from 0.1 to 2000 cycles per minute (cpm).…”

Section: Introductionmentioning

confidence: 99%

“…Table I lists some examples of allowable combinations. 4 The upper die is attached to a torque transducer to eliminate noise from the lower die drive system and to measure the transmitted torque through the sample. This torque is called the complex torque or S* and it is not in-phase with the applied strain due to the viscoelastic nature of rubber.…”

Section: Introductionmentioning

confidence: 99%

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Viscoelastic characterization of uncured NR/Cel II compositions

Martins¹,

Visconte²,

Nunes³

2005

J of Applied Polymer Sci

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ABSTRACT:In this work three types of equipments were used, namely, rubber process analyzer (RPA 2000), Mooney viscometer, and dynamic mechanical thermal analyzer, to characterize natural rubber mixtures containing different amounts of regenerated celulose (Cel II) as filler. The RPA 2000 is a new dynamic rheological tester that can analyze raw polymers and masterbatches as well as rubber compounds before, during, and after cure. The Mooney viscometer is probably the most widely used method for measuring shearing viscosity of unvulcanized rubbers or rubber compositions. DMTA is used to assess filler-rubber interactions. In the present investigation, RPA tests on unvulcanized natural rubber and regenerated cellulose (Cel II) mixtures were carried out using strain and frequency sweeps, and the Mooney viscosities were determined using the relaxation accessory and the small rotor. DMTA data were taken at a fixed frequency and temperature sweep. The filler content was increased up to 30 phr. Compositions were prepared by cocoagulation of natural latex and cellulose xanthate mixtures. The results showed a good dispersion of the filler in the rubber matrix and its large influence on rheological and dynamic properties of the resulting compositions.

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Fourier-Transform Rheology of Unvulcanized, Carbon Black Filled Styrene Butadiene Rubber

Schwab

Hojdis

Lacayo

et al. 2016

Macromol. Mater. Eng.

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Rubber materials filled with reinforcing fillers display nonlinear rheological behavior at small strain amplitudes below γ0 < 0.1. Nevertheless, rheological data are analyzed mostly in terms of linear parameters, such as shear moduli (G′, G″), which loose their physical meaning in the nonlinear regime. In this work styrene butadiene rubber filled with carbon black (CB) under large amplitude oscillatory shear (LAOS) is analyzed in terms of the nonlinear parameter I3/1. Three different CB grades are used and the filler load is varied between 0 and 70 phr. It is found that I3/1(φ) is most sensitive to changes of the total accessible filler surface area at low strain amplitudes (γ0 = 0.32). The addition of up to 70 phr CB leads to an increase of I3/1(φ) by a factor of more than ten. The influence of the measurement temperature on I3/1 is pronounced for CB levels above the percolation threshold.

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Applications of a New Dynamic Mechanical Rheological Tester in Measuring Carbon Black and Oil Effects on Rubber Compound Properties

Cited by 13 publications

References 6 publications

Propriedades Reológicas e Dinâmicas de Composições Não-Vulcanizadas de Borracha Natural com Celulose Regenerada

Propriedades Reológicas e Dinâmicas de Composições Não-Vulcanizadas de Borracha Natural com Celulose Regenerada

Viscoelastic characterization of uncured NR/Cel II compositions

Fourier-Transform Rheology of Unvulcanized, Carbon Black Filled Styrene Butadiene Rubber

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