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<p>Various crosslinked PDMS films incorporating cyclic epoxy groups were prepared by UV-induced acid generation and thermal curation and evaluated as CO₂-selective permeable membranes. These free-standing, ultrathin PDMS films (~100 nm thick) were formed by crosslinking side-epoxy-PDMS, which contains multiple epoxy groups, and end-epoxy-PDMS, which has epoxy groups at the polymer ends only. Gas permeation tests revealed that the films crosslinked with end-epoxy-PDMS exhibited high CO₂ permeance. Specifically, the membrane composed of UV-crosslinked end-epoxy-PDMS (Mn = 20,000, thickness ~ 200 nm) achieved a CO₂ permeance of 5200 GPU and a CO₂/N₂ selectivity of 11.0. Reducing the membrane thickness increased the permeance without affecting selectivity. However, shortening the siloxane chain, using side-epoxy-PDMS, or reducing the linker length led to decreases in both permeance and selectivity. For example, side-epoxy-PDMS (Mn = 30,000, Si-H/O-Si-O ratio = 37%, thickness ~ 200 nm) had a CO₂ permeance of 400 GPU and a CO₂/N₂ selectivity of 1.16. These results indicate that a lower crosslinking density and longer end-epoxy-PDMS siloxane chains are advantageous for CO₂ dissolution and diffusion, resulting in superior CO₂ permeance and selectivity compared with composed of side-epoxy-PDMS.</p>

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Photocrosslinked films composed of polydimethylsiloxane bearing alicyclic epoxy units and their CO₂-selective permeation properties

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  • 发表日期：

    2025年6月3日

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  • Shiori Hashiguchi,
  • Masahiko Kawata,
  • Takeo Nakano,
  • Kimihiro Matsukawa,
  • Masashi Kunitake

摘要

Various crosslinked PDMS films incorporating cyclic epoxy groups were prepared by UV-induced acid generation and thermal curation and evaluated as CO₂-selective permeable membranes. These free-standing, ultrathin PDMS films (~100 nm thick) were formed by crosslinking side-epoxy-PDMS, which contains multiple epoxy groups, and end-epoxy-PDMS, which has epoxy groups at the polymer ends only. Gas permeation tests revealed that the films crosslinked with end-epoxy-PDMS exhibited high CO₂ permeance. Specifically, the membrane composed of UV-crosslinked end-epoxy-PDMS (Mn = 20,000, thickness ~ 200 nm) achieved a CO₂ permeance of 5200 GPU and a CO₂/N₂ selectivity of 11.0. Reducing the membrane thickness increased the permeance without affecting selectivity. However, shortening the siloxane chain, using side-epoxy-PDMS, or reducing the linker length led to decreases in both permeance and selectivity. For example, side-epoxy-PDMS (Mn = 30,000, Si-H/O-Si-O ratio = 37%, thickness ~ 200 nm) had a CO₂ permeance of 400 GPU and a CO₂/N₂ selectivity of 1.16. These results indicate that a lower crosslinking density and longer end-epoxy-PDMS siloxane chains are advantageous for CO₂ dissolution and diffusion, resulting in superior CO₂ permeance and selectivity compared with composed of side-epoxy-PDMS.