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针对芳纶纤维表面光滑、惰性强、与橡胶的黏接性能差,严重影响了橡胶复合材料力学性能的缺点。采用KMnO4(5%)+H2SO4(15%)以1∶1混合溶液和K2Cr2O7(10%)+H2SO4(25%)以1∶1混合溶液分别对其表面进行改性处理,处理后从电子能谱仪(ESCA)可以测到纤维表面的化学组成发生了明显的变化,C的含量明显下降,N、O的含量有所提高,含氧基团也有明显的提高;通过角接触仪测定纤维与水、乙二醇的接触角明显减小,从而使纤维表面的活性有了一定幅度的提高。制得芳纶纤维-硅橡胶复合材料的力学性能由未处理的3.281MPa,分别提高到3.943MPa和3.685MPa(分别提高了20.2%和12.3%)。通过SEM照片可以对纤维与橡胶的微观界面进行分析,讨论其作用机理。
Aramid fibers for the smooth surface, inert, and poor adhesion of rubber, rubber and rubber seriously affect the mechanical properties of the shortcomings. The surface of KMnO4 (5%) + H2SO4 (15%) was mixed with 1: 1 mixed solution and K2Cr2O7 (10%) + H2SO4 ESCA can detect the chemical composition of the fiber surface has undergone significant changes in the content of C decreased significantly, the content of N, O increased oxygen-containing groups have also been significantly improved; contact angle measurement of fiber and The contact angle of water and ethylene glycol decreased obviously, so that the activity of fiber surface increased to a certain extent. The mechanical properties of the aramid fiber-silicone rubber composites increased from untreated 3.281 MPa to 3.943 MPa and 3.685 MPa (20.2% and 12.3% respectively). The microscopic interface of fiber and rubber can be analyzed by SEM photograph to discuss the mechanism of action.