丁苯橡胶分子结构和炭黑对挤出流变行为的影响

摘要

通过毛细管流变仪并结合多种表征测试手段,研究丁苯橡胶分子结构和炭黑用量对胶料挤出流变特性的影响.结果表明:乳聚丁苯橡胶(ESBR)和炭黑补强ESBR胶料的表观剪切粘度分别大于溶聚丁苯橡胶(SSBR)和炭黑补强SSBR胶料;ESBR与SSBR的挤出稳定性相当,但炭黑补强SSBR胶料的挤出稳定性更优,挤出物外观质量较好;与SSBR相比,ESBR的分子链柔顺性和炭黑在其基体中的分散性更好,炭黑补强ESBR胶料中结合胶含量更高.%The effects of molecular structure of SBR and addition level of carbon black on the extrusion rheological behavior of SBR/carbon black compounds were investigated by capillary rheometer and several other characterization methods.The results showed that,the apparent shear viscosity of ESBR was higher than that of SSBR for either raw rubbers or carbon black reinforced compounds.The extrusion stability of ESBR and SSBR was quite similar,while the extrusion stability of carbon black reinforced SSBR compound was much better than that of carbon black reinforced ESBR compound and its appearance quality was better.Compared with SSBR,the molecular flexibility of ESBR and dispersion of carbon black in ESBR matrix were better,and the bound rubber content of carbon black reinforced ESBR compound was higher.