热孔法表征特种高分子合金超滤膜的孔径

Characterization of pore size distribution in the SPSF/PEK alloy UF membranes by thermoporometry

用热分析方法（ＤＳＣ）对磺化聚砜（ＳＰＳＦ）与聚醚酮（ＰＥＫ）高分子合金超滤膜的孔径和孔结构进行了研究．由实验得到热谱图，经计算得到不同合金比（ＳＰＳＦ／ＰＥＫ）的超滤膜孔径及孔径体积分布．研究结果表明，在一定条件下，ＳＰＳＦ／ＰＥＫ以不同的比例混合时，其膜的孔径分布范围在５～１５ｎｍ，平均孔径在６～９ｎｍ之间；当合金比（ＳＰＳＦ／ＰＥＫ）等于或大于４∶６时，所制得的超滤膜对聚乙二醇（ＰＥＧ，ＭＷ＝１００００）的截留率大于９０％．

The pore size and its volume distribution of polymer alloy UF membranes which were prepared from sulfonated polysulfone(SPSF) and polyetherketone (PEK) were studied by thermoporometry.The pore radius and pore volume distribution of the membranes can be calculated from the experiments.The results showed that at different SPSF/PEK ratioes values of the pore radius and the average radius of the membranes were determined to be 5～15 nm and 6～9*'nm respectively.When SPSF/PEK≥4∶6,the retention of alloy membranes for PEG( M W=10 000)was over 90%.The morphologies of different SPSF/PEK alloy UF membranes were also discussed.