氧化还原功能纤维的研究──Ⅶ．含正丙胺基吸附剂的制备及其对Au^（3＋）的吸附性能

以氯甲基化纤维、聚乙烯醇（ＰＶＡ）接枝甲基丙烯酸缩水甘油酯（ＧＭＡ）_一缩二乙二醇丙烯酸双酯（ＤＧＡ）纤维：氯球三种反应性基体，合成了含氮量分别为２．３４，２．９４，１．６１ｍｍｏｌ／ｇ的含正丙胺基吸附剂。结果表明：该类吸附剂在高酸度（ｐＨ＜１．５）及低酸度（ｐＨ＞３．５）对Ａｕ^（３＋）都有较高的吸附量，而在ｐＨ１．５～３．０的吸附量较小甚至为零；且该类吸附剂在低酸度（ｐＨ＞２．５）对Ａｕ^（３＋）有还原作用，随溶液离子强度升高，吸附剂对Ａｕ^（３＋）的吸附量下降。吸附动力学实验结果表明：含正丙胺基吸附剂在ｐＨ４．０对Ａｕ^（３＋）的吸附速度很慢，７２ｈ后仍未达到饱和吸附。在扫描电子显微镜下观察到吸附态金聚集成粒状。

Fabrication and characterization of electrospun biocompatible PU/PEGMA hybrid nanofibers by in-situ UV photopolymerization

Poly（ethylene glycol） methacrylate （PEGMA） was introduced into a polyurethane （PU） solution in order to prepare hemocom- patible electrospun membranes for potential application as small diameter vascular scaffolds. Crosslinked PU/PEGMA hybrid nanofibers were fabricated by a reactive electrospinning process with N,N＇-methylenebisacrylamide （MBAm） as erosslinker and benzophenone （BP） as photoinitiator. The photoinduced polymerization and crosslinking reaction took place simultane- ously during the electrospinning process. No significant difference in the membrane morphology was found by SEM when PEGMA content was less than 20 wt%. The crosslinked fibrous membranes of PU/PEGMA exhibit higher hydro- philicity and mechanical strength than PU membrane. These nanofibrous membranes are potential substitutes for artificial vascular scaffolds.