The influence of amine antioxidant D37 on the ozone aging process of SIBR

The effect of amine antioxidant D37 on the structure and performance of Styrene-Butadiene-Isoprene rubber (SIBR) during ozone aging process has been studied in this work, and simultaneously compared with Styrene-Butadiene rubber of Solution polymerization (SSBR) and Neodymium Catalyzed-Isoprene Rubber (Nd-IR). It can be seen from the ATR-FTIR spectrum that the introduction of antioxidant D37 has a better protective effect on polyisoprene structural units, and the protective effect of antioxidant D37 on SIBR is in the middle of those of on SSBR and Nd-IR. From the results of microscope-infrared, after adding antioxidant, the intensity of the absorption peak of carbon-oxygen bond structure is obviously weaker than that without antioxidant, but is stronger than that of the sample surface. It is attributed to the diffusion and migration of the antioxidant from the inside of the sample to the surface of the sample, preventing the ozone from reacting with the rubber, and effectively preventing the generation and expansion of ozone cracks. After adding antioxidants, the initial ozone cracking time of SIBR is prolonged, and the initial ozone cracking time is in the middle of the initial ozone cracking time of SSBR and Nd-IR. The introduction of carbon black inhibits the protective effect of antioxidant D37, shortens the time of initial ozone cracking, and obviously increases the length and depth of the cracks, but the number of cracks decreases, resulting in a greater decrease in the mechanical properties of SIBR after ozone aging.