高分散水性碳纤维的制备

Preparation of Highly Dispersed Aqueous Carbon Fibers

关键词:  BMH3碳纤维  碳纤维纸  表面改性  分散剂  分散性能

Key Words:BMH3 carbon fiber  carbon fiber paper  surface modification  dispersant  dispersibility

摘要:本研究以壳聚糖盐酸盐（CHI）和十二烷基磺酸钠（SDS）制备改性剂（CHI&SDS），采用浸渍法对BHM3碳纤维进行表面改性，以提升BMH3碳纤维在水中的分散能力。系统研究了CHI/SDS质量比、CHI&SDS改性剂质量分数及纤维长度对改性BMH3碳纤维在水中分散性的影响，并通过X射线光电子能谱仪和动态接触角测试仪，对改性BMH3碳纤维化学结构和表面润湿性进行了表征。结果表明，BMH3碳纤维经过质量分数0.15%，CHI/SDS质量比=25∶1的CHI&SDS改性剂改性后，纤维长度5 mm的改性BMH3碳纤维在水中的分散率可达96.2%，相较于未改性碳纤维提升了87.5个百分点。改性BMH3碳纤维表面含氧官能团数量显著提升，水接触角明显降低，这是BMH3碳纤维分散性能改善的原因，也是成功实现高分散水性碳纤维制备的基础。

Abstract:In this study， chitosan hydrochloride （CHI） and sodium dodecyl sulfate （SDS） were used to prepare modifier （CHI&SDS） that used to impregnate and modify the surface of BMH3 carbon fibers， in order to enhance the dispersing ability of the BMH3 carbon fibers in water. The effects of CHI/SDS mass ratio， mass concentration of CHI&SDS modifier， and fiber length on the dispersibility of modified BMH3 carbon fibers in water were systematically investigated， and the chemical structure and surface wettability of the modified BMH3 carbon fibers were characterized and tested by X-ray photoelectron spectroscopy and dynamic contact angle test. The results showed that the dispersion rate of modified BMH3 carbon fibers with fiber length of 5 mm in water could reach 96.2%， which was 87.5 percentage points higher compared with that of unmodified BMH3 carbon fibers， after modified with a solution of CHI/SDS mass ratio =25∶1 at CHI&SDS modifier mass concentration of 0.15%. The number of oxygen-containing functional groups on the surface of the modified carbon fiber was significantly increased， and the water contact angle was significantly reduced， which was the reason for the improved dispersion of the carbon fiber and the basis for the successful preparation of highly dispersed aqueous carbon fiber.