填胶量对BR/SBR/NR发泡材料硫化发泡特性及相结构的影响

采用无转子发泡流变仪系统研究了不同填胶量对顺丁橡胶(BR)/丁苯橡胶(SBR)/天然橡胶(NR)发泡体系的硫化及发泡特性的影响,并采用两步模压法制备了预交联度为30%不同填胶量的发泡材料,通过扫描电镜(SEM)观察并计算出填胶量对相结构(泡孔直径、泡孔壁厚度、单位体积内的泡孔数)的影响。结果表明,体积分数为70%～120%的填胶范围时可呈现典型的硫化历程;填胶体积分数为60%～80%时可清晰地呈现典型的发泡历程;填胶体积分数在70%～90%范围内,随着填胶量增加,泡孔直径显著减小,泡孔壁显著变薄,单位体积内的泡孔数显著增加;填料体积分数在100%～120%范围内对相结构的影响较小。

Effect of feeding volume on morphology, vulcanization and foaming characteristics of BR/SBR/NR foams

The effects of the feeding volumes on the vulcanization and foaming characteristics of the blends of 1,4-cis polybutadiene rubbers（BR）,styrene-butadiene rubber（SBR）,and natural rubber（NR）foams were investigated by foam force rheometer.The rubber foams were prepared by two-stage compression molding technique to precure degree 30% with the various feeding volumes,and observed and calculated to the morphology（including of the cell size,the thickness of cell wall and the number of cells per cubic centimeter）by SEM.The results showed that the range of feeding volume between 70%~120% appears the typical vulcanization process,and the range between 60% and 90% presents the typical foam process clearly.With the increasing of feeding volume between 60% and 90%,the cell size decreases obviously,the thickness of cell wall becomes thinner apparently,and the number of cells per cubic centimeter increases obviously.The feeding volume had little influence on the morphology between 100% and 120%.