白炭黑对炭黑／丁苯橡胶复合材料耐疲劳性能的影响

研究白炭黑对炭黑／丁苯橡胶（SBR）复合材料耐疲劳性能的影响。结果表明：与炭黑iSBR复合材料相比，白炭黑／炭黑/SBR胶料的t₁₀延长，交联密度下降，硫化胶的100%和300%定伸应力减小，拉断伸长率增大；在相同应变下，SBR复合材料的疲劳寿命延长，疲劳裂纹增长速率对撕裂能的敏感程度差别不大；白炭黑粒径越小，比表面积越大．结构度越低，对SBR复合材料的耐疲劳性能越有利。;The effect of silica on the fatigue resistance of carbon black/SBR composite was investi gated. The results showed that， compared with carbon black/SBR composite， the tio of silica/carbon black/SBR compound was extended，the crosslink density decreased，the modulus at 100% and 300%elongation of the vulcanizates decreased， and the elongation at break increased. With silica， the fatigue life of SBR composite was extended at the same strain level. However，the sensitivity of tearing energy on fatigue crack growth rate of the composite changed little. It was found that the silica with smaller the particle size ，larger specific surface area and lower structure， was more effective to improve the fatigue resistance of SBR composite