Abstract
Influence of carbon black (CB)/precipitated silica (SiO2) hybrid ratio on properties of a passenger car tire (PCT) sidewall based on natural rubber (NR) and butadiene rubber (BR) blend was investigated. Rubbers filled with various hybrid filler ratios at a constant loading of 50 phr were prepared and tested. The filler reinforcement efficiency in association with crucial properties of the tire sidewall were of interest. Results show the enhanced rubber–filler interaction with increasing SiO2 fraction leading to the improvement in many vulcanizate properties including hardness, tensile strength, tear strength and fatigue resistance, at the expense of cure efficiency and hysteretic behaviors (i.e., reduced heat build-up resistance and increased dynamic set). The results also suggest the improvement in tire sidewall performance of the NR/BR vulcanizates reinforced with CB/SiO2 hybrid filler, compared to that of the CB-filled vulcanizate.
Highlights
Reinforcing filler is one of the most critical ingredients in tire production
The results imply that the higher rubber-filler interaction (BRC) and the stronger filler-filler network in the SiO2-rich systems play a greater role in the hardness of rubber vulcanizates than the crosslink density
It is possible to summarize the effect of hybrid filler ratio on tire sidewall performance as illustrated in Fig. 9 in which the properties of the carbon black (CB)-filled vulcanizate were employed as references for normalization
Summary
Reinforcing filler is one of the most critical ingredients in tire production. Typically, tire formulations contain approximately 30 % by weight of reinforcing fillers, mainly carbon black (CB) and precipitated silica (SiO2) [1]. Unlike in the tread applications, little attention has been paid to the use of CB/SiO2 hybrid filler technology for improving crucial properties of the tire sidewall compounds.
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