氨气低温等离子体技术对聚碳酸酯聚氨酯表面改性

Surface Modification of Polycarbonate Urethane by Low-Temperature Ammonia Plasma

利用氨气低温等离子体对聚碳酸酯聚氨酯材料进行表面修饰改性研究,讨论了改性条件对材料表面亲水性和表面形态的影响。结果表明,修饰材料表面的亲水性得到改善,随着表面氨基浓度增大,接触角降低;表面形态由高度平整光滑变为粗糙结构,而且粗糙程度因修饰条件不同而异;材料表面N/C比值从原始材料的2.44%上升到3.98%。时效性考察结果表明,水接触角在5 h内迅速上升,在10 h之后趋于一个稳定值。预期改性后的聚碳酸酯聚氨酯具有优异生物相容性,是人工血管适宜材料之一。

The polycarbonateurethane（PU） surface was modified by low-temperature ammonia plasma.The influences of modification conditions on the contact angle,amine content and surface morphology were investigated by water contact angle,scanning electron microscope（SEM） and X-ray photoelectron specroscopy（XPS）.The results show that the hydrophilicity of PU surface is improved significantly after ammonia plasma modification.The water contact angle decreases with amine content on the surface increasing.The smooth surface gradually becomes rough after plasma modification.The surface morphology is different with different modified conditions.The C/N ratio on the surface increases from 2.44% to 3.98% after treatment,respectively.Water contact angle increases quickly in 5 h and then does not change any more within 10 h after plasma modification.As expected the ammonia plasma modified PU has good biocompatibility for preferred candidates for vascular graft.