纤维素膜膜孔和膜性能的接枝调控

摘要

After the PEG end group modificated by mercaptoacetic acid, the cellulose membrane regenerated by the vinyl, and then the thiol PEG is grafted to the regenerated cellulose membrane in UV irradiation conditions. The PEG and PEG thiol are characterized by NMR, and the surface structures of original membrane, vinyl membrane, light triggered membrane are observed by ATR-FTIR and XPS, respectively. The changes of pure water flux and pore size distribution of the original membrane and the modified membrane are also inspected, and the fouling resistance of modified membrane is observed by the dynamic anti-pollution experiment for bovine serum phosphate buffer solution (BSA / PBS). The experimental results show that the thiol of PEG is synthesized successfully, and ATR-FTIR and XPS prove that PEG chains are grafted onto the membrane surface successfully. Compared to the original film the anti-pollution capability of modified membrane has been enhanced.%采用巯基乙酸对聚乙二醇（PEG）端基进行修饰，然后将再生纤维素膜乙烯基化，在UV照射的条件下，将巯基化PEG接枝到乙烯化后的再生纤维素膜表面，并用核磁共振对PEG和巯基化的PEG进行表征；分别用ATR-FTIR和XPS观察原膜、乙烯化膜、光引发后膜表面的结构组成；考察原膜与改性膜的纯水通量、孔径分布变化；并通过对牛血清磷酸缓冲溶液（BSA/PBS）的动态抗污染实验考察改性膜的耐污染能力。结果表明：成功合成出了巯基化PEG，ATR-FTIR及XPS证明了PEG链成功接枝在膜的表面；改性后膜的抗污染能力较原膜有所增强。