Filler Phase Distribution in Rubber Blends Characterized by Thermogravimetric Analysis of the Rubber-Filler Gel

2008 ◽  
Vol 81 (5) ◽  
pp. 767-781 ◽  
Author(s):  
H. H. Le ◽  
S. Ilisch ◽  
G. R. Kasaliwal ◽  
H-J. Radusch
Keyword(s):  
Thermogravimetric Analysis ◽  
Carbon Black ◽  
Phase Distribution ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
The Matrix ◽  
Kinetics Of ◽  
Wetting Rate ◽  
Rubber Filler

Abstract The analysis of the rubber-filler gel of carbon black filled rubber compounds and blends provides useful information about the mixing process taking place inside the internal mixer. A new measure technique named wetting rate was introduced to describe the wetting behavior of the rubber onto the filler. Natural rubber (NR)/styrene-butadiene rubber (SBR) blends has been used for experimental investigation. NR shows a significantly higher wetting rate than SBR. The wetting rate does not only depend on the viscosity of rubber but strongly on the functionalization of it. Using the data determined from the thermogravimetric analysis (TGA) of rubber-filler gel, a new method was developed to characterize the kinetics of carbon black (CB) localization in the phases of heterogeneous rubber blends. During the first mixing stage, the CB localization is affected strongly by the wetting rate ratio of the blend components. In the second mixing stage, the rubber-filler interaction dominantly influences the distribution kinetics of the filler to the phases. Because of the higher wetting rate of the NR component, in the investigated NR/SBR blends more CB is found in the NR phase than in the SBR phase. The effect of the matrix viscosity and polarity on the phase specific CB distribution was systematically investigated.

EFFECT OF CURING ADDITIVES ON THE DISPERSION KINETICS OF CARBON BLACK IN RUBBER COMPOUNDS)

2011 ◽  
Vol 84 (3) ◽  
pp. 415-424 ◽  
Author(s):  
H. H. Le ◽  
S. Ilisch ◽  
E. Hamann ◽  
M. Keller ◽  
H-J. Radusch
Keyword(s):  
Carbon Black ◽  
Stearic Acid ◽  
Electrical Conductance ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Dispersion Process ◽  
Styrene Content ◽  
Styrene Butadiene ◽  
Kinetics Of

Abstract The effect of curing additives on the dispersion kinetics of carbon black (CB) in styrene butadiene rubber (SBR) compounds was investigated by means of the method of the online measured electrical conductance. Addition of curing additives such as stearic acid and diphenylguanidine (DPG) accelerates the CB dispersion process significantly. The viscosity of the rubber matrix was not changed after their addition. The addition of stearic acid and DPG may alter the filler–filler interaction that consequently leads to faster dispersion processes. The obtained difference in morphologies of SBR mixtures containing stearic acid and DPG, respectively, are caused by their different infiltration behavior, which may lead to different dispersion mechanisms. Addition of ZnO could not improve the dispersion process of CB because of its limited interaction with CB. Sulfur and N-cyclohexylbenzothiazole-2-sulfenamide decelerate the CB dispersion process. The strong effect of the rubber microstructure such as styrene content and molecular weight on the CB dispersion in SBR mixtures without additives was found and discussed by taking into consideration the known dispersion mechanisms. The influence of addition of curing additives on the CB dispersion in low styrene-content SBR mixtures is much more pronounced than that in high styrene-content SBR mixtures.

scholarly journals Chemical resistance of NR/SBR rubber blends for surfaces corrosion protection of metallic tanks in petrochemical industries

2020 ◽  
Vol 64 (2) ◽  
pp. 65-71
Author(s):  
A. J. Braihi ◽  
A. J. Jawad ◽  
A. A. H. Kadhum ◽  
H. S. S. Aljibori ◽  
A. A. Al-Amiery
Keyword(s):  
Tensile Strength ◽  
Carbon Black ◽  
Surface Area ◽  
Carbon Black Particle ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Corrosive Media ◽  
Rubber Blends ◽  
Before And After ◽  
Hardness Values

AbstractIn this work, a series of Natural Rubber (NR)/Styrene Butadiene Rubber (SBR) blends were formulated to protect metallic petrochemical storage tanks from corrosive media. Therefore, these blends tested against a 10% HCl solution for 72 hr at room temperature. Blends series were prepared with different ratios of NR/SBR; 25/75, 30/70, 35/65, 40/60, 45/55, 50/50, and 55/45. Three types of carbon black (N-330, N-660, and N-762) were added individually to the 45/55 blend. Hardness, tensile strength, modulus, and elongation properties were tested before and after immersion in the 10% HCl attack media. All these mechanical properties decreased after immersion action accept hardness property. Up to 45 phr NR content, the hardness increased linearly independent on immersion action, but HCl immersion gives higher hardness values. Tensile strength increased up to 40 phr NR content with and without immersion and the immersion action decreased tensile values. The highest elongation value obtained with 35/65 blend with and without immersion. The 45 phr NR content gives the higher modulus, while the lowest value obtained with the 30 phhr content. For 45/55 blend, the hardness increased as the carbon black particle size decreased and immersion action gives higher hardness values. The tensile strength decreased linearly with the carbon black surface area, while with the medium surface area, the highest modulus and lowest elongation obtained.

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