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<p>Carbon molecular sieve membranes (CMSM) were fabricated through the pyrolysis of precursor polymer blends membranes composed of polyetherimide (PEI) and polyethersulfone (PES) in varying ratios (97:3, 95:5, and 93:7). The precursor polymer blends exhibited lower thermal stability than pure PEI, while the glass transition temperature of blends increased with PES content. The PEI and PES blends demonstrated molecular-level immiscibility, with PES-dispersed domains surrounded by PEI. Increasing PES content in precursor blends reduced CMSM thickness, increased interplanar spacing, and decreased the graphitization level of carbon structures. The polymer blend with a 93:7 ratio yielded the carbon membrane with selectivities of 20, 55, and 146.7 for O<sub>2</sub>/N<sub>2</sub>, CO<sub>2</sub>/N<sub>2</sub>, and CO<sub>2</sub>/CH<sub>4</sub> gas pair, respectively, indicating a promising relationship between selectivity and permeability for industrial applications. The results suggest that the blend of PEI and PES is a promising precursor for the preparation of CMSM with potential applications in gas separation processes.</p>

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A novel PEI/PES polymer blend for development of carbon molecular sieve membranes applied to gas separation

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Thaís Martins Neves,
  • Liliane Damaris Pollo,
  • Nilson Romeu Marcilio,
  • Isabel Cristina Tessaro

摘要

Carbon molecular sieve membranes (CMSM) were fabricated through the pyrolysis of precursor polymer blends membranes composed of polyetherimide (PEI) and polyethersulfone (PES) in varying ratios (97:3, 95:5, and 93:7). The precursor polymer blends exhibited lower thermal stability than pure PEI, while the glass transition temperature of blends increased with PES content. The PEI and PES blends demonstrated molecular-level immiscibility, with PES-dispersed domains surrounded by PEI. Increasing PES content in precursor blends reduced CMSM thickness, increased interplanar spacing, and decreased the graphitization level of carbon structures. The polymer blend with a 93:7 ratio yielded the carbon membrane with selectivities of 20, 55, and 146.7 for O2/N2, CO2/N2, and CO2/CH4 gas pair, respectively, indicating a promising relationship between selectivity and permeability for industrial applications. The results suggest that the blend of PEI and PES is a promising precursor for the preparation of CMSM with potential applications in gas separation processes.