硫黄在天然橡胶/丁苯橡胶并用胶中偏析行为的研究

Study on Segregation Behavior of Sulfur in NR/SBR Blends

制备普通硫黄硫化体系的天然橡胶(NR)/丁苯橡胶(SBR)并用胶,研究硫黄在NR/SBR并用胶中的偏析行为。结果表明:硫黄在NR/SBR并用胶中偏析于SBR相,且在NR与SBR界面处可能存在共交联;NR/SBR并用胶的t10和t90随着NR/SBR并用比的增大而缩短;硫黄用量为2.25份时,NR/SBR并用胶的交联密度和硬度随着NR/SBR并用比的增大而增大;硫黄用量为3.25份时,过硫化的SBR相以“增强微球”在NR基体中起补强作用。

Natural rubber(NR)/styrene-butadiene rubber(SBR)blends with common sulfur curing system were prepared,and the segregation behavior of sulfur in the NR/SBR blends was studied.The results showed that,sulfur segregated in the SBR phase,and there might be co-crosslinking at the interface between NR and SBR.The t10 and t90 of the NR/SBR blends was shortened with the increase of the NR/SBR blending ratio.When the amount of sulfur was 2.25 phr,the crosslinking density and hardness of the NR/SBR blends increased with the increase of the NR/SBR blending ratio.When the amount of sulfur was 3.25 phr,the over-vulcanized SBR phase acted as the reinforcement microspheres in the NR matrix.