过氧化物DCP交联丁苯橡胶拉伸过程的微观结构研究

The microstructure evolution of peroxide DCP crosslinked styrene-butadiene rubber（SBR）during the tensile process was studied by atomic force microscopy（AFM），and the effect of peroxide DCP amount on the tensile orientation of SBR was investigated. The results showed that，with the increase of peroxide DCP amount，the crosslink density of SBR increased，the tensile strength increased first and then decreased，and the elongation at break decreased. Overall，with the stress increasing，the area ratio of the amorphous region of SBR with 0. 2 and 0. 3 phr peroxide DCP decreased，the area ratio of the orientated amorphous region and highly orientated region increased，and the modulus decreased first and then increased. Within the appropriate peroxide content range，the SBR with the larger peroxide DCP amount showed more significant tensile orientation behavior and had a higher orientation degree. The Mooney-Rivlin model analysis results confirmed that the AFM analysis was reliable.