通过普通、半有效、有效、过氧化物及复合硫化体系设计出不同的交联网络结构，研究了不同交联网络硫化胶的屈挠疲劳性能，并通过扫描电子显微镜详细分析了屈挠疲劳断面的微观形貌。结果表明，过氧化物硫化体系的屈挠疲劳性能介于普通和有效硫化体系之间，交联键键能对屈挠疲劳性能有一定影响。从微观角度描述了橡胶疲劳裂纹发展的机理，多硫键柔顺性好，疲劳断面的收缩部分呈沟壑状，单硫键柔顺性差、键能低，粗糙断面相对细碎，碳碳键刚性大、键能高，粗糙断面呈片层状。

Different crosslinking network structures are designed by conventional,semi-efficient,efficient,peroxide and composite vulcanization systems,respectively.The curing characteristics,dynamic and static mechanical properties of natural rubbers with different crosslinking networks are studied,and the emphasis is put on flexing fatigue properties.The micromorphology of flexing fatigue section of natural rubber is analyzed in detail by scanning electron microscope.The results show that the flexing fatigue properties of the natural rubber vulcanized by peroxides are between that of the natural rubber vulcanized by conventional and efficient vulcanization systems.The bond energy of crosslinking bond has a certain influence on the flexing fatigue properties.The growing mechanism of fatigue cracking of natural rubber is described from a microcosmic perspective.The polysulfide bond gives good flexibility,thus the contraction part of fatigue section is of ravine shape;Single sulfide bond represents poor flexibility and lower bond energy,therefore bringing about relative fine crushing rough section;The carbon-carbon bond exhibits large rigidity and higher bond energy,and the rough section is of lamellar.

崔雪静(1992-),女,硕士研究生,研究方向为橡胶材料的改性和加工,1013255920@qq.com