生物酶催化UHMWPE纤维表面改性

以辣根过氧化物酶(HRP)为催化剂,在H₂O₂存在下,氧化邻甲氧基酚形成自由基,引发超高分子量聚乙烯纤维(UHMWPE)表面接枝聚丙烯酰胺,达到其表面改性的目的。通过正交实验确定了表面接枝的最佳条件:反应时间为1.5 h,H₂O₂的浓度为0.03%,邻甲氧基酚的浓度为0.5%。纤维单丝拔出实验结果表明,酶法改性的UHMWPE纤维/环氧树脂体系的界面粘结强度有明显提高,最大拔出强度比原纤维提高了69.8%。电镜扫描及红外光谱表征结果显示,改性后的UHMWPE纤维表面的粗糙度增加,并有新基团产生。 

SURFACE MODIFICATION OF UHMWPE FIBERS USING ENZYME AS CATALYST

The surface of ultrahigh molecular weight polyethylene (UHMWPE) fibers was grafted by an acrylamide. Using a horseradish peroxidase (HRP) as catalyst in hydrogen peroxide, the reaction was generated by free radical, which is formed by oxidizing o-methoxyphenol. The best condition of graft polymerization was determined by the orthogonal test. The results of the fiber pull out test show that after enzymatic treatment, the interfacial shear strength of the system surface increased, and the pull out strength of treated UHMWPE fibers increased by 69.8%. Its optimum value appears when the initiator concentration, H_2O_2 concentration and the reaction time are 0.5%, 0.03%, and 90 min, respectively. Infrared spectroscopy (IR) and Scanning Electron Microscopy (SEM) show that roughness of UHMWPE surface increased, and a new radical appears in IR. The probable catalytic mechanism of HRP was discussed.