Surface Modification of Aramide Fibers by Radical Shower

对芳香族聚酰胺纤维进行了表面改性，以提高聚酰胺纤维与硅橡胶的粘接性能。等离子体暴露可以使芳纶表面亲水，但芳纶的降解是由电子和离子轰击引发的。降解过程涉及酰胺基团的断键和酰胺低聚物的形成，是表面改性中的棘手产物。提出了一种新的无电子、无离子相互作用的芳香族聚酰胺表面改性技术--“远程等离子体处理”。在远程等离子体处理中，聚合物样品不位于等离子体区中，而是远离等离子体区。等离子体中的自由基物种到达样品位置，但电子和离子物种没有到达，因为电子和离子的寿命比自由基的寿命短。通过对聚乙烯薄膜的表面改性和聚乙烯薄膜的表面氯化，展示了远程等离子体表面改性新技术的优越性。通过远程等离子体还可以将芳族聚酰胺表面从疏水性改性为亲水性。扫描电镜和原子力显微镜观察表明，远程等离子体处理后的芳纶表面光滑，没有受到电子和离子轰击的严重损伤。

The surface of aromatic polyamide (Aramide) fibers has been modified to improve adhesion between the polyamide fiber and silicon rubber. Plasma exposure can make Aramide surface hydrophilic, but degradation of Aramide is initiated by electrons and ions bombardment. The degradation involes the bond scission of amide groups and the formation of oligomers of amide, and is troublesome products in the surface modification. A new technique which is called " Remote Plasma Treatment " is proposed for surface modification of Aramide without heavy interactions between polymer surface and electrons or ions. In the remote plasma treatment, the polymer samples are not positioned in the plasma zone, but far from the plasma zone. Radical species in the plasma reach at the sample position, but the electron and ion species do not reach, because of shorter lifetime of the electron and ions than that of the redicals. The advantages of the new surface modification technique by the remote plasma are demonstrated in the surface modidication of poly (tetrafluoroethylene) films and the surface chlorination of polyethylene films. Aramide surface also can be modified from hydrophobic to hydrophilic by the remote plasma. SEM and AFM observations show the surface of Aramide treated with remote plasma is smooth without heavy damage by electron and ion bombardments.