辣根过氧化物酶催化表面修饰聚酰亚胺纤维及其润湿功能性

Modification of Polyimide Fiber with Horseradish Peroxidase and Improvement of Its Hydrophilicity

关键词:  聚酰亚胺纤维  辣根过氧化物酶  磷酸单酯  表面修饰  亲水性能

Key Words:polyimide fiber  horseradish peroxidase  phosphate monoester  surface modification  hydrophilicity

摘要:为了进一步提高聚酰亚胺（PI）纤维的润湿性及其在水介质中的分散性，本研究首先探究了在辣根过氧化物酶（HRP）催化作用下在PI纤维表面生长磷酸单酯长链（PMOEs）结构，比较了表面修饰前后纤维在水介质中的分散稳定性及纤维对极性溶剂的接触角。采用扫描电子显微镜（SEM）、原子力显微镜（AFM）和X射线光电子能谱仪（XPS）对纤维表面的物理和化学结构变化进行了分析，通过热重分析仪（TG）和X射线衍射仪（XRD）对纤维的热学性能和结晶性能进行了表征，并对纤维成纸孔径分布变化进行了分析。结果表明，在HRP催化作用下通过自由基反应在PI纤维表面成功生长出了PMOEs网状结构并得到PI-PMOEs纤维，与PI纤维相比，当PMOE加入量为25.6 g时，PI-PMOEs-3纤维与去离子水的接触角降低了13.6°，与乙醇的接触角降低了9.9°，纤维分散度增加了40个百分点，纤维的亲水性能得到显著改善。

Abstract:In order to further improve the wettability and dispersibility of PI fiber in water, this research explored the growth of PMOEs on the surface of PI fiber under the catalysis of horseradish peroxidase (HRP). In addition, SEM, AFM and XPS were used to analyze the changes of physical and chemical structures of the fiber surface. The thermal and crystalline properties of the fiber were characterized by TG and XRD, and the pore size distribution of the paper made of the fibers was analyzed. The results showed that the PMOEs network was successfully grown on the surface of PI fiber by free radical reaction under the catalysis of HRP, and PI-PMOEs fiber was prepared. Compared with PI fiber, when PMOEs was added 25.6 g, the contact angles of PI-PMOEs-3 fiber with deionized water and ethanol decreased by 13.6°and 9.9°, respectively.Additionally, the fiber dispersity increased by 40 percentage point and the hydrophilic property of the fiber improved significantly.