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| Preparation and Performance Study of Flexible Polysulfonamide Heat-insulating Porous Films |
| Received:November 12, 2025 Revised:December 02, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.03.009 |
| Key Words:Polysulfonamide porous films phase separation method thermal insulation performance high temperature stability |
| Fund Project:国家自然科学基金（22078187）；生物质化学与材料国际联合研究中心（2018GHJD-19）。 |
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| Abstract:To develop a new type of insulating layer material for thermal protection in firefighting clothing, this study first dissolved polyphenylsulfone (PSA) fibers in N, N-dimethylacetamide, then used a water/ethanol mixture as a nonsolvent to prepare lightweight, soft, highly flame-retardant, and thermally insulating flexible PSA porous films via the nonsolvent-induced phase separation (NIPS) technique. The pore structure and thermal insulation properties of the films were precisely controlled by varying the phase separation conditions. The results showed that when the ethanol proportion in the nonsolvent was 80%, the PSA film had the lowest porosity (67.5%) and the smallest average pore size (100.0 nm), with a tensile strength of 13.4 MPa, a thermal conductivity as low as 0.025 W/(m·K), and exhibited excellent flexibility and thermal stability, providing effective thermal protection under high-temperature heating conditions. |
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