借助硅气凝胶改善和调控聚丙烯腈热交联膜孔结构及性能

Improving and tuning the pore structure and performance of thermally cross-linked PAN membrane via the silica aerogel

以正硅酸乙酯(TEOS)为前驱体,采用溶胶凝胶法制备硅溶胶并将其引入聚丙烯腈超滤膜孔道中,经过热交联制得具有丰富海绵状孔结构的TPAN/SiO2(TPS)杂化膜,考察了TEOS浓度对TPS杂化膜的孔结构和渗透性能的影响.结果表明,TPS杂化膜孔内引入的硅气凝胶限制了膜孔道结构在热交联过程的融并;随着TEOS浓度的增加,TPS杂化膜的平均有效孔径增加,水通量提高,所制备的杂化膜的BSA截留率都在98%以上;同时,杂化膜表现出优异的热稳定性和良好的耐溶剂性.

Silica sol was prepared by sol-gel method using ethyl orthosilicate(TEOS)as the precursor and introduced into the pores of polyacrylonitrile(PAN)ultrafiltration membranes.Then,the cross-linked PAN(TPS)hybrid membrane with a sponge-like pore structure was prepared through thermally cross-linking reaction.The effects of the concentration of TEOS on the pore structure and permeability of the TPS hybrid membrane were investigated.The results showed that the silica aerogel which was introduced into the pores of TPS hybrid membrane restricted the collapse of pore structure during the thermal crosslinking process.With the increase of TEOS concentration,the average effective pore size and water flux of the TPS hybrid membrane both increase.The TPS hybrid membranes have the higher rejection rate for BSA above 98%.Additionally,the hybrid membrane exhibits excellent thermal stability and good solvent resistance.