SBR/高耐磨炭黑的共混方式对其硫化胶性能的影响

测定了高耐磨炭黑填充型粉末SBR[P(SBR/HAF)]，SBR 胶乳/炭黑共沉胶(ESBR/HAF)和SBR块胶/炭黑机械混炼胶(MSBR/HAF)3种不同共混方式的硫化胶的力学性能。结果发现，在炭黑填充量相同的条件下，3种硫化胶的定伸应力和拉伸强度的大小顺序为MSBR/HAF>P(SBR/HAF)>ESBR/HAF，撕裂强度及扯断永久变形的大小顺序为ESBR/HAF>P(SBR/HAF)>MSBR/HAF。拉伸断面形貌的SEM分析表明，MSBR/HAF硫化胶以微裂纹导致基体空化，P(SBR/HAF)以既有微裂纹导致基体空化又有裂缝扩展及分支，ESBR/HAF则以裂缝扩展及分支的方式断裂。;The mechanical properties of the vulcanizates prepared by HAF-filled powdered SBR[P(SBR/HAF)]，SBR latex/HAF coprecipitation (ESBR/HAF)and bale SBR/HAF (MSBR/HAF) mixes respectively were investigated.The results showed that with the same addition level of carbon black，the values of modulus and tensile strength for MSBR/HAF，P(SBR/HAF)and ESBR/HAF vulcanizates were in the order of the first >the second >the third，the tear strength and the tensile set at break were in the order of the third >the second >the first.It was found through the observation of the surface morphology at tensile fracture by SEM that the fracture behavior of MSBR/HAF vulcanizate was the rubber matrix cavitation caused by microcrack，that of P(SBR/HAF)was both the rubber matrix cavitation caused microcrack and the crack growth and branching，and that of ESBR/HAF was the crack grow th and branching