短纖維對橡膠發(fā)泡復(fù)合材料增強機理

分別制備未增強的橡膠發(fā)泡體、未處理短纖維增強的橡膠發(fā)泡體和預(yù)處理短纖維增強的橡膠發(fā)泡體,考察氣體泡孔和短纖維在橡膠發(fā)泡復(fù)合體中的微觀形態(tài),細觀分析短纖維對橡膠發(fā)泡管拉伸行為和壓縮行為過程各階段的增強機理.結(jié)果表明:氣體泡孔在3種發(fā)泡復(fù)合材料基體中分布均勻,模壓工藝使得短纖維在基體中呈現(xiàn)為平面分布,未處理短纖維周圍有氣泡包圍,而預(yù)處理短纖維與橡膠間粘合良好;短纖維能有效地提高發(fā)泡復(fù)合材料在初始階段的拉伸模量和100%定伸應(yīng)力,特別是預(yù)處理短纖維表面與橡膠之間具有良好的粘合,有利于傳遞應(yīng)力,限制橡膠基體的變形,而對拉伸強度卻影響不大.
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.
在壓縮彈性階段,由于主要承載的泡壁中纖維呈平面取向,短纖維對壓縮模量影響不大,但能有效地限制橡膠發(fā)泡復(fù)合材料在后屈曲階段的壓縮變形,提高其在高應(yīng)變下的壓縮強度,預(yù)處理短纖維增強效果明顯高于未處理短纖維.
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.