过氧化物DCP交联丁苯橡胶拉伸过程的微观结构研究

利用原子力显微镜（AFM）观测过氧化物DCP交联丁苯橡胶（SBR）拉伸过程的微观结构演变，研究过氧化物DCP用量对SBR拉伸取向行为的影响。结果表明：随着过氧化物DCP用量增大，SBR的交联密度增大，拉伸强度先增大后减小，拉断伸长率减小；整体来看，随着应变增大，过氧化物DCP用量为0. 2和0. 3份的SBR无定形区面积占比呈减小趋势，取向无定形区和高度取向区面积占比呈增大趋势，模量呈先减小后增大趋势；在适当范围内过氧化物DCP用量大的SBR更容易发生拉伸取向行为，且取向度更高。Mooney-Rivlin模型分析结果佐证了AFM分析结果的正确性。;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