Tread Wear and Wet Skid Resistance of Butadiene-Styrene Elastomers and Blends

Abstract

1. Car, wheel position, driver, inflation pressure, and shoulder drop have a statistically significant effect upon wear loss and need to bo taken into consideration before material factors affecting wear can be studied. 2. Variations in macrostructure of the polymers are not found to have a significant effect on wear as compared to microstructure variations. 3. At least two material factors control wear loss of tire treads. 4. When polymers are tested near their glass transition temperature (within 80° C), wear loss is dominated by viscoelastic properties. Viscoelastic properties can be related to wear loss through Tg or the combined effect of the cis, trans, vinyl, and styrene content. 5. At higher test temperatures (over 100° C above Tg) wear loss is dominated by a material factor that has a positive correlation with temperature. This is particularly noticeable when treads are worn under mild conditions. However, there is evidence that this wear factor is present at the testing nearer to Tg but is masked by the dominant viscoelastic effect. 6. The combined effect upon wear of the different material factors leads to an optimum wear resistance for any polymer in the butadiene—styrene system in the range of 75°–105° C above the Tg for that polymer. 7. For polymers tested at the same ambient temperature, (T), the effect of viscoelastic properties decreases non-linearly as T−Tg increases. 8. In the range of test severity studied, severity has little effect upon the inter-relationship of material factors. 9. In the range of test temperature where Tg dominates wear loss, skid distance on wet asphalt pavement is inversely related to wear rating.

The Influence of the Styrene Content and Features of the Molecular Structure of Solution-Polymerised Styrene Butadiene Rubber on the Service Properties of Tread Rubbers

“…Increase in T g indicates a reduction in the rate of relaxation processes in the polymer and consequently leads to a reduction in elasticity. In turn, low elasticity of the rubbers results in an improvement in the wet road holding of the tyres, with an appreciable reduction in wear resistance [12][13][14]. These conclusions are entirely consistent with our findings.…”

“…Today, it is generally acknowledged that the abrasion and wet road holding of tyres depend on the glass transition temperature of the rubbers in the tread formulation [12,13]. Increase in T g indicates a reduction in the rate of relaxation processes in the polymer and consequently leads to a reduction in elasticity.…”

Effect of mineral fillers on physico-mechanical properties and heat conductivity of carbon black-filled SBR/butadiene rubber composite

“…The T g of carbon black/ HDS and carbon black/HDS/AL filler systems has increased compared to the T g of carbon black counterpart. Keinel and Dizon showed that the polymers with higher T g give greater abrasion loss or poorer abrasion resistance [43].…”

Synthesis of novel diene polymer via friedel–crafts‐type reaction of polybutadiene with aromatic compounds

“…The precise control of polymer microstructure has still been one of the active research areas in polymer chemistry because polymer microstructure is closely related to the properties of polymeric materials such as rubber products. For example, some investigations have been conducted on the relationship between physical properties of rubber materials and the microstructures of styrene‐butadiene rubber (SBR), which are four monomeric units, 1,4‐ cis , 1,4‐ trans , 1,2‐vinyl and styrene units, thus far . Saito et al reported that antiabrasion, wet skid and rolling resistance properties of tire treads have good relationships with styrene and 1,2‐vinyl contents of the used SBRs 1(c) …”