Effect of Electron Beam Irradiation on the Properties of High Styrene Rubber/Styrene Butadiene Rubber Blends

Abstract Dissolution of sulfur-cured, carbon black-loaded copolymers and their blends with cis-1,4-polybutadiene (PBD) are brought about by boiling with o-dichlorobenzene which contains a small amount of 2,2′-dibenzamidodiphenyl disulfide. The resulting slurries are subjected to a sequence of separations which include high-speed centrifugation to remove solids, and solvent precipitation followed by filtration to isolate the precipitates. The precipitates are washed with solvent to remove soluble organic materials followed by carbon disulfide washing to dissolve the polymers. Cast films of the polymers are obtained by evaporating the carbon disulfide washings onto sodium chloride discs. The infrared spectra of the cast films of these preparations are very similar to those of their respective polymers prior to loading and curing. Calculations for relative concentrations of bound styrene and PBD micro-structures permit nominal identification of the kinds of styrene-butadiene rubber and the amounts of cis-1,4-PBD used in a cured rubber formulation. Absorption bands used are near 3.35 μ for cis-1,4-PBD, 6.65 μ for bound styrene, 10.35 μ for trans-1,4-PBD; and 11.0 μ for vinyl-1,2-PBD. Efforts are being made to improve the data by using a grating infrared instrument and also to extend the calibrations to include other rubber blends.

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Gamma irradiation of (styrene butadiene rubber)/(devulcanized waste rubber) blends modified by organoclay

Journal of Vinyl and Additive Technology ◽

10.1002/vnl.21524 ◽

2015 ◽

Vol 24 (1) ◽

pp. 50-57 ◽

Cited By ~ 9

Author(s):

E. S. Fathy ◽

Hoda H. Saleh ◽

Mona Y. Elnaggar ◽

Zakaria I. Ali

Keyword(s):

Gamma Irradiation ◽

Styrene Butadiene Rubber ◽

Butadiene Rubber ◽

Rubber Blends ◽

Waste Rubber ◽

Styrene Butadiene

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Novel modification of styrene butadiene rubber/acrylic rubber blends to improve mechanical, dynamic mechanical, and swelling behavior for oil sealing applications

Polymers and Polymer Composites ◽

10.1177/09673911211031351 ◽

2021 ◽

pp. 096739112110313

Author(s):

Ahmed Abdel-Hakim ◽

Soma A el-Mogy ◽

Ahmed I Abou-Kandil

Keyword(s):

Mechanical Properties ◽

Crosslink Density ◽

Physical And Mechanical Properties ◽

Dynamic Mechanical Properties ◽

Styrene Butadiene Rubber ◽

Butadiene Rubber ◽

Rubber Blends ◽

Dynamic Mechanical ◽

Oil Resistance ◽

Styrene Butadiene

Blending of rubber is an important route to modify properties of individual elastomeric components in order to obtain optimum chemical, physical, and mechanical properties. In this study, a novel modification of styrene butadiene rubber (SBR) is made by employing acrylic rubber (ACM) to obtain blends of outstanding mechanical, dynamic, and oil resistance properties. In order to achieve those properties, we used a unique vulcanizing system that improves the crosslink density between both polymers and enhances the dynamic mechanical properties as well as its resistance to both motor and break oils. Static mechanical measurements, tensile strength, elongation at break, and hardness are improved together with dynamic mechanical properties investigated using dynamic mechanical analyses. We also proposed a mechanism for the improvement of crosslink density and consequently oil resistance properties. This opens new opportunities for using SBR/ACM blends in oil sealing applications that requires rigorous mechanical and dynamic mechanical properties.

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