离子注入硅橡胶和聚氨脂表面改性的研究

A STUDY ON SURFACE MODIFICATION OF SILICONE RUBBER AND POLYURETHANE BY ION IMPLANTATION

研究了离子注入医用高分子材料硅橡胶,聚氨脂表面浸润性和白蛋白吸附性的变化。硅橡胶样品分别在40,60,80,100keV能量下注入N^+和Ar^+、注入剂量为2×10^(12)～2×10^(17)cm^(-2),聚氨脂样品在60～100keV能量下注入Si^+,剂量为2×10^(13)～2×10^(16)cm^(-2)。注入后的样品测量了水接触角和白蛋白吸附量。结果表明:随注入剂量增加硅橡胶表面与水的接触角从86°下降到59°;聚氨脂样品的水接触角从84°下降到69°。用傅立叶变换衰减全反射红外光谱(FT-IR-ATR)研究了注入后表面的键合状态。发现离子束轰击打断了一些表面的化学键,在表面形成了一些自由基。对Si^+注入的聚氨脂样品作了顺磁共振分析,发现表面的自由基随注入剂量增加,强度增加。用扫描电子显微镜观察了注入后的表面形貌。

A surface study has been made on wettability adsorption of albumin and surface structure of medical silicone rubber and polyurethane by ion implantation. N^+ and Ar^+ implantation were performed at the energy of 40, 60, 80, 100keV with the dose ranging from 2×10^(12) to 2×10^(17) ions/cm^2 and Si^+ implantation at the same energy with dose ranging from 2×10^(13) to 2×10^(10) ions/cm^2 at room temperature. The wettability was measured by means of the contact angle between the sample surface and water. The adsorption of albumin was also measured using an ultraviolet spectrometer. The results show that the contact angle of water decreased from 86 to 59 degrees for silicone rubber and from 84 to 69 degrees for polyurethane with the dose increased. The adsorption of albumin increased from 16 to 32μg/cm^2, The SEM photos show that the surface was made rough by ion beam bombardment. The results of FT-IR-ATR and ESR indicate that the ion beam breaks up original chemical bonds to form new radicals for both silicone rubber and polyurethane and form some new functional groups only for silicone rubber, These may be the main reason for the surface modification.