聚醚醚酮表面的亲水改性和胶原蛋白固定化

采用紫外光接枝法对聚醚醚酮(PEEK)表面进行化学修饰和生物分子固定化.首先向PEEK表面引入亲水性的丙烯酰胺,并以此为反应位点通过戊二醛将胶原和胶原蛋白固定在PEEK表面.用接触角测定仪、扫描电镜、荧光标记和X射线光电子能谱等对改性薄膜进行了表征.结果表明,PEEK上丙烯酰胺的接枝密度高达50.9μg/cm~2;改性薄膜表面浸润性显著提高,水接触角最低降至(22±3)°.荧光标记胶原固定的PEEK薄膜荧光发射光谱强度最高,并在X射线光电子能谱中检测到N元素,表明胶原已固定化,固定胶原蛋白的浓度为10.2μg/cm~2.

Surface Hydrophilic Modification of Poly(ether ether ketone) and Immobilization of Collagen

Surface modification of poly(ether ether ketone)(PEEK) was performed to increase the surface wettability. Acrylamide( AAm) was grafted on the surface of PEEK film by ultraviolet grafting to improve the hydrophilicity through the introduction of hydrophilic groups. Then, glutaraldehyde was used to immobilize collagen and hydrolyzed collagen on surface of the material. Fluorescein-labelled collagen was also used to verify the immobilization. The surfaces of PEEK film before and after modification were characterized by contact angle meter, scanning electron microscope, fluorescence spectrophotometer and X-ray photoelectron spectrometer. The results show that the surface morphology and the hydrophilicity are changed significantly after surface modification. Polyacrylamide grated on PEEK has a density of as high as 50. 9 μg/cm2 . PEEK-g-PAAm becomes hydrophilic with a decreased water contact angle of ( 22±3 )o. Surface immobilized with hydrolyzed collagen labeled with fluorescein isothiocyanate exhibits strong fluorescence effect. Modified films immobilized with collagen showed nitrogen peak, which was not observed for unmodified PEEK film in X-ray photoelectron spectroscopy, indicating the successful immobilization of collagen. The concentration of collagen immobilized on PEEK was determined to be 10. 2 μg/cm2 .