短纤维对橡胶发泡复合材料增强机理

分别制备未增强的橡胶发泡体、未处理短纤维增强的橡胶发泡体和预处理短纤维增强的橡胶发泡体,考察气体泡孔和短纤维在橡胶发泡复合体中的微观形态,细观分析短纤维对橡胶发泡管拉伸行为和压缩行为过程各阶段的增强机理.结果表明:气体泡孔在3种发泡复合材料基体中分布均匀,模压工艺使得短纤维在基体中呈现为平面分布,未处理短纤维周围有气泡包围,而预处理短纤维与橡胶间粘合良好;短纤维能有效地提高发泡复合材料在初始阶段的拉伸模量和100%定伸应力,特别是预处理短纤维表面与橡胶之间具有良好的粘合,有利于传递应力,限制橡胶基体的变形,而对拉伸强度却影响不大.
Preparation of strengthened respectively, rubber foam, untreated short fiber reinforced rubber foam and preprocessing of short fiber reinforced rubber foam, gas bubble hole and short fibers in the microstructure of rubber foam in the complex, mesoscopic analysis of short fiber on the tensile behavior of rubber foam composite material and the action mechanism of each stage of compression behavior process. The results show that the gas bubble hole in three kinds of foamed composites matrix of uniform distribution, moulding process makes the short fibers in the matrix appears as the plane distribution, surrounded by untreated short fiber around the bubble, and pretreatment of good adhesion between short fiber and rubber; Short fibers can effectively improve the foaming composite materials in the initial stage of the tensile modulus and 100% stretch stress, especially the pretreatment with good adhesion between short fiber and rubber surface, conducive to transfer stress and limit the deformation of the rubber matrix and the tensile strength has little influence.
在压缩弹性阶段,由于主要承载的泡壁中纤维呈平面取向,短纤维对压缩模量影响不大,但能有效地限制橡胶发泡复合材料在后屈曲阶段的压缩变形,提高其在高应变下的压缩强度,预处理短纤维增强效果明显高于未处理短纤维.
In elastic stage, because is mainly for the bubble wall of fibers were plane orientation, short fiber influence on compression modulus is not big, but can effectively limit the rubber foaming composite materials in the stage of compression buckling deformation, improve the compression strength under high strain, pretreatment of short fiber reinforced effect is significantly higher than the untreated short fiber.