为改善纯钛表面的抗凝血性能,合成了一系列磷酸胆碱仿生聚合物,并在其表面构建了稳定的仿生涂层,通过一系列实验、表征和评价优化出更有利于钛材表面改性的磷酸胆碱聚合物。首先采用简单的自由基聚合法和羧基与氨基的反应,分两步合成了5种不同比例的2-甲基丙烯酰氧乙基磷酰胆碱(MPC)、甲基丙烯酸(MA)和多巴胺(DA)的无规共聚(PMMDA3-Q、PMMDA3-T、PMMDA5-Q、PMMDA5-T、PMMDA7),并通过FTIR、1 H NMR、GPC以及UV-Vis等完成了定性、定量表征和分析。通过自组装的方式,将5种不同聚合物分别组装到钛表面,并采用QCM-D、AFM及血小板粘附实验考察了5种聚合物在钛表面的组装量、表面粗糙度以及改性后的钛表面抗血小板粘附及抑制血小板激活的能力。结果表明,聚合物PMMDA7更适合作为钛材表面改性聚合物,为构建磷酸胆碱仿生多功能涂层提供了实验基础和方法。
Microgrooves were prepared on Si(100) surface by photolithography and wet etching.Subsequently,Si-N-O films were deposited on the microgrooves by unbalanced magnetron sputtering(UBMS) and micro-patterned surfaces of Si-N-O films were obtained.The size of the micropatterns was measured by surface profilometer.The chemical composition of Si-N-O films were characterized by X-ray photoelectron spectrometry(XPS) and the wettability of the micropatterned surfaces was evaluated by contact angle measurement.The behavior of endothelial cells adhered on the micro-patterned surfaces,including cells adhesion,proliferation and orientation,was evaluated by cell culture test and Alamar blue assay.The results showed that the amount and activity of endothelial cells on micro-patterned samples were higher than those on flat samples.After one day's incubation,the cells were well guided along the microgrooves.Three days later,most of the cells grew across the grooves and contacted each other.Their activity was also much higher than that on flat samples.It was suggested that the adhesion and proliferation of endothelial cells could be effectively enhanced by micropattern method.
ZHENG Nan,YANG Ping,WANG QiYi,YANG ZhongHai & HUANG Nan Key Laboratory of Advanced Technology for Materials of Education Ministry,Key Laboratory of Artificial Organ Surface Engineering of Sichuan,School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China
