Examination of Selection and Combination of Water-Absorbing Agent to Blend with Polyvinyl Alcohol (PVA) in Preparing CO2-Separation Membrane with High-Performance

摘要

In the present study, the selection and combination of the water-absorbing agent to blend with polyvinyl alcohol (PVA) for the preparation of a high-performance CO2-separation membrane were examined by evaluating the separation performance of the resulting membrane. The separation performance of a two-layer membrane prepared by stacking and a single-layer membrane prepared by blending were also compared, where the latter was found to be superior. The selection of a water-absorbing agent with higher water absorption and compatibility with PVA is important in the preparation of a high-performance separation membrane by blending. The high-performance CO2-separation membrane was prepared by blending PVA with two types of water-absorbing agents. In addition, the variation in the composition ratio of two water-absorbing agents further improved the CO2-separation performance. Accordingly, the high-performance CO2-separation membrane was successfully prepared by combining PVA with two water-absorbing agents.