聚烯烃纤维表面光接枝的ESCA表征

以320—440nmUV为光源,二苯甲酮(BP)为光引发剂,丙烯酸(AA)和丙烯酰胺(AM)为单体,在高强度聚乙烯(HSPE)纤维上进行光引发接枝反应。由于纤维,表面接枝仅发生在小于50A的极薄层内,这样的表面接枝率不可能用通常的称重法测定,因而无法用通常意义的重量接枝率来表征。本文对表面接枝纤维用X射线光电子能谱(ESCA)进行分析测试,以谱中氮(或氧)原子1s内壳层电子和碳原子1s内壳层电子谱线的积分强度相对比值来表征接枝程度。傅里叶红外(FTIR)内反射光谱的测试结果,以及对接枝纤维进行的染色性和粘接性测试表明,用ESCA的上述积分强度相对比值(RI％)来半定量表征接枝程度是合宜的。

CHARACTERIZATION OF PHOTOGRAFTED SURFACE OF HSPE FIBER BY ESCA

Surface grafting of acrylic monomers onto High Strength Polyethylene (HSPE) fibre have been achieved by means of a photoinitiated continuous process, a UV lamp (320-440nm) used as a radiation source and benzophenone a photoinitiator. However it is difficult to measure such a thin layer of grafts by weighing usually used. The degree of surface grafts can be characterized by Electron Spectroscopy for Chemical Application (ESCA). The relative integral intensities of the ESCA core electron lines, oxygen and nitrogen to carbon, O18/C18 and N18/C18, are used to indicate the relative degree of grafting of acrylic acid (AA) and acryla-mide (AM) as monomers, respectively.The determinations of the grafting by Fourier Transform infrared Spectroscopy (FTIR) (ATR method) and "dyeability" as well as adhesion to epoxy resin for the grafted HSPE fibre are compared with those by ESCA, indicating that the relative integral intensity of ESCA core electron lines, RI%, can be appropriate to characterize relatively the degree of surface grafts of HSPE fiber.