Geri dönüştürülmüş karbon siyahı takviyeli doğal kauçuk karışımlarında yorulma çatlak ilerlemesi karakterizasyonu

This research assesses the reinforcement effects of virgin (vCB) and recycled carbon black (rCB) in natural rubber (NR). It focuses on the durability of NR with different carbon black (CB) types, particularly how CB dispersion affects fatigue crack growth. The study notes that CBs with larger surface areas tend to have lower dispersion. It explores the impact of CB surface area on dispersion and hardness, using fatigue crack growth rate and tearing energy data to illustrate the influence of CB type and mixing time for 120 s, 280 s, 440 s, and 600 s on rubber’s fatigue resistance (Figure A). Purpose: The research aims to explore the reinforcing properties of recycled carbon black (rCB) and virgin carbon black (vCB) in natural rubber (NR), comparing the performance of rCB-reinforced NR with N330 and N550 vCB-reinforced NR. It highlights carbon black dispersion's role in enhancing fatigue crack growth and mixture hardness, assessing rCB's viability as a sustainable rubber reinforcement alternative. Theory and Methods: This study examines the impact of virgin (vCB) and recycled carbon black (rCB) on natural rubber (NR)'s durability, comparing NR reinforced with N330, N550 vCB, and rCB. The study assesses the effects of CB type and mixing time on NR's fatigue resistance by analyzing fatigue crack growth rates against tearing energy. Unstable crack growth data were omitted for precision. Testing involved samples with N330 and rCB, mixed for 440 and 600 seconds across various strain rates, increasing sample counts to nine per level for enhanced reliability. Using consistent batch materials allowed detailed examination of mixing effects on dispersion and fatigue crack development, showcasing the complex interplay between mixing time, dispersion, and fatigue performance in a streamlined summary. Results: The study showed rCB-reinforced NR had higher fatigue crack propagation rates than N330 and N550 vCB-reinforced samples, highlighting notable differences in endurance. The material constant β in the crack growth rate prediction equation for rCB-reinforced NR was determined to be 3.83 and 3.95 for 5000 cycles and 4.17 and 3.49 for 10000 cycles at 440 s and 600 s mixing durations respectively. Conclusion: rCB significantly affects rubber's mechanical properties, showing its potential as a sustainable reinforcer, but with notable endurance differences compared to vCB. While helping the sustainability goals by using rCB, they still need to be improved to surpass the vCB performance.