Super high gas separation performance membranes derived from a brominated alternative PIM by thermal induced crosslinking and carbonization at low temperature

巴勒 碳化 微型多孔材料 选择性 气体分离 化学工程 材料科学 热稳定性 聚合物 高分子化学 化学 复合材料 有机化学 吸附 工程类 催化作用 生物化学
作者
Yatao Weng,Nanwen Li,Zelong Xu,Jianjun Huang,Lujun Huang,Hong Wang,Jianxin Li,Yali Wang,Xiaohua Ma
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:314: 123548-123548 被引量:10
标识
DOI:10.1016/j.seppur.2023.123548
摘要

In carbon dioxide capture and sequestration, achieving excellent performance, robustness, and reliability of gas separation membranes is a big challenge. Here, we report two novel highly crosslinked and partially carbonized molecular sieve membranes (CCMSM) that partially achieve the above goals for the first time. By thermally treating a novel bromomethyl substituted alternative intrinsic microporous polymer at relatively low temperatures of 340 °C and 350 °C, two PIM-BA-340 and PIM-BA-350 CCMSMs were obtained. They underwent the mechanism of triazine crosslinking (type I), debromomethylation induced crosslinking (type II) and partial carbonization (type III), resulting in membranes with excellent solvent resistance, thermal stability, and good mechanical strength. The PIM-BA-350 demonstrates a very small (4.1 Å) and intensive ultra-micropore (65.2%), consequently, outstanding gas separation property that outperformed various updated trade-off curves. The permeability of O2 is 145 Barrer and O2/N2 selectivity is 10.8, and further reaches unprecedented 22.2 at −20 °C. Additionally, PIM-BA-350 also shows remarkable CO2/CH4 separation property with CO2 permeability of 619 Barrer and CO2/CH4 selectivity of 124, even at a CO2/CH4 mixed-gas feeding pressure of 550 psi, there is no plasticization, and the selectivity for CO2/CH4 still reaches 106 coupled with a CO2 permeability of 306 Barrer. This low temperature formation of CCMSM paves a new path in searching for advanced membranes, and offers a great perspective in O2 and CO2 based industrial applications.
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