氧等离子体改性对聚酰亚胺纤维表面性能的影响

为增强聚酰亚胺纤维的界面黏附性能,采用氧等离子体技术对聚酰亚胺纤维进行不同时间的改性处理,借助X射线光电子能谱仪、场发射扫描电子显微镜、接触角表面性能测定仪,以及单纤维碎裂法等分析改性处理对聚酰亚胺纤维表面性能的影响。结果表明:在气压为10 Pa,功率为100 W的工艺条件下,采用氧等离子体处理4 min时聚酰亚胺纤维表面改性效果最佳;与原丝相比,此时纤维表面O与C元素含量比增加了108%,含氧基团C—O、C=O的含量分别由7.6%、10.3%增加到20.4%、19.2%;纤维表面产生均匀致密的微裂缝,其与树脂间界面剪切强度由29.88 MPa增加到46.13 MPa,增强率达54%;聚酰亚胺纤维与水的接触角从110°左右减小至55°以下,由疏水表面变为亲水表面。

Influence of oxygen plasma modification on surface properties of polyimide fiber

In order to enhance the interface adhesion performance, polyimide fiber was modified by oxygen plasma for different time periods and the influence of modification on the surface properties of polyimide fiber was analyzed by X-ray photoelectron spectroscopy, field emission scanning electron microscopy, single fiber fragmentation method and contact angle measurement. The results show that the surface properties of polyimide fibers are improved remarkably after 4 min treatment under the conditions of oxygen plasma modification with pressure of 10 Pa and power of 100 W. At the treatment conditions, the content ratio of O to C on the surface is increased by 108%, compared with untreated fibers. The contents of C—O and C=O increase from 7.6% and 10.3% to 20.4% and 19.2%, respectively. The surface micro-cracks are uniform and dense. The interfacial shear strength between fiber and resin increases from 29.88 MPa to 46.13 MPa,and its enhancement rate is 54%. And the hydrophobic surface is improved to hydrophilic surface, the contact angle reduces from about 110° to below 55°.