【摘要】 用 Instron-3211型毛细管流变仪,研究了转化率为60％和62％的两种低温乳聚丁苯橡胶的流变性能。这两种不同转化率的生胶及炭黑混炼胶的流变性能基本上相近,均表现出假塑性流体的流动特征,挤出温度为80—130℃时,n值约为0.1—0.6。转化率60％的生胶及炭黑混炼胶的表观粘度与转化率62％的相近;而粘流活化能E_γ和E_τ则稍大。炭黑混炼胶的E_γ和E_τ均不同程度地小于相应的生胶。在同样条件下,转化率60％的胶料膨胀比略大于转化率62％的。两种炭黑混炼胶的挤出破裂行为均随挤出温度的升高、剪切速率的降低和炭黑用量的增加而有所改善;当炭黑用量为 10份或30份,挤出温度为80℃时,均有类似第二光滑区的现象产生;当用量达50份时,未出现破裂现象。更多还原

【Abstract】 The rheological properties of cold SBR with two different monomer conversions of 60% and 62% were investigated by an Instron 3211 capillary rheometer. It was found that the rheological properties of the raw rubbers and their carbon black compounds were much the same showing pseudoplastic feature with 0.1<n<0.6 in extrusion temperatures between 80-130℃.The apparent viscosity of the raw rubber with conversion 60% and its compound was nearly the same with those of conversion 62%, but the flow activation energy Er and Er were slightly higher.Er and Ei of the compounds were less than those of the raw rubbers to some extent. Under the same conditions, the value of die swell ratio for conversion 60% was bigger than that with conversion 62%. The. apparence of ex-trudate roughness was improved with the incresing of temperature and carbon black loading and the decreasing of the shear rate. A simlar second smooth region would appear when the carbon black loading was 10 or 30 parts by weight and extruding temperature was 80℃. The melt fracture would not occur when the carbon black loading increased to 50 parts by Weight,更多还原