剑麻纤维表面特性及其浸润行为

采用Weibull统计分布方法量化了剑麻纤维的横截面积, 并考虑液体在剑麻纤维中空结构中的芯吸质量, 发展了基于Wilhelmy吊片法原理测试剑麻纤维与液体动态接触角的表征方法。在此基础上, 分析了不同表面处理方法对剑麻纤维微观结构、 表面化学组成、 表面能及其色散、 极性特性的影响规律, 并测试了剑麻纤维与E51环氧树脂的浸润性。结果表明: NaOH、 阻燃剂处理使剑麻纤维表面极性官能团增加, 纤维的表面能极性分量增加显著; 硅烷处理增加了剑麻纤维表面的极性基团含量, 但使其极性分量减小, 表面能略有下降; 并且剑麻纤维与E51树脂的浸润性与其极性比匹配特性密切相关。

Surface properties and the wetting behavior of sisal fibers

The dynamic contact angle analytical method of sisal fiber based on Wihelmy plate principle was developed on the basis of the quantification of the cross-section area by using Weibull statistical distribution function and the measurment of liquid wicking quality caused by the hollow structure of sisal fiber.On this basis,the influences of different surface treatment methods on the surface microstructure,the surface chemical composition,the surface energy as well as its dispersion,polar component were analyzed.Also the wettability between sisal fiber and E51 epoxy resin was measured.The results show that the surface polar functional groups and polar component of surface energy of sisal fiber are significantly increased after being treated by NaOH and flame retardants.Although the surface polar functional groups are increased by silane treatment,the polar component decreased with the total surface energy slightly reduced.The wettability between sisal fiber and E51 resin is closely related to the matching characteristics of polar ratio of surface energies.