Preparation, Thermal Stability, and Preliminary Gas Separation Performance of Furan-Based Bio-Polyimide Films

作者：Wei Jiao, Jie Zhou, Qinying Gu, Zijun Liu, Jiashu Pan, J.M. Qin, Yiyi Zhu, Dengbang Jiang, Jian‐Yong Hu · 发表于：Polymers · 年份：2025 · DOI：10.3390/polym17101362 · 被引用次数：5 · 研究领域：Membrane Separation and Gas Transport、Synthesis and properties of polymers、Dielectric materials and actuators

The need for renewable alternatives to petroleum-based polymers is growing in response to environmental concerns and resource depletion. Polyimides (PIs), which are traditionally synthesized from petroleum-derived monomers, raise sustainability issues. In this work, renewable 2,5-furandicarboxylic acid (FDCA) was employed as a sustainable feedstock to synthesize a bio-based diamine monomer, N,N′-bis(4-aminophenyl)furan-2,5-dicarboxamide (FPA). Subsequently, FPA was polymerized with various aromatic dianhydrides through thermal imidization, yielding four distinct bio-based polyimide (FPA-PI) films. The resulting films exhibited exceptional thermal stability, with 5% weight loss temperatures exceeding 425 °C and char yields ranging from 54% to 60%. Mechanical characterization revealed high elastic moduli (2.14–3.20 GPa), moderate tensile strengths (50–99 MPa), and favorable aging resistance. Gas permeation tests demonstrated promising CO2/N2 separation performance, with FPA-DODDA achieving superior CO2/N2 selectivity (27.721) compared to commercial films such as Matrimid®, polysulfone, and polycarbonate, while FPA-BPFLDA exhibited enhanced CO2 permeability (P(CO2) = 2.526 Barrer), surpassing that of Torlon®. The CO2/N2 separation performance of these FPA-PI films is governed synergistically by size-sieving effects and solution-diffusion mechanisms. This work not only introduces a novel synthetic route for bio-based polymers but also highlights the potential of replacing convent...