Novel diamines containing spirobisbenzoxazole scaffold structure were successfully synthesized. These diamines were homopolymerized with commercial 4,4’-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and cyclohexanedianhydride (H'PMDA) to prepare a series of benzoxazole based polyimides (PBOIs). The obtained PBOIs exhibited good organic solubility and outstanding thermal properties, including glass transition temperature (T_g) of 355–400 °C and 5% thermal decomposition temperatures (T_d5%) of 474–490 °C. Meanwhile, these polymer films exhibited excellent mechanical strength, such as tensile strength of 79.4–92.1 MPa and elongation at break of 19.5%∼31.2%. In addition, such PBOIs have been proved to be novel microporous polymer with pore width distribution of 5–7 Å and BET surface area of 281–378 m²/g. The permeability-selectivity relationship of H'PMDA based PBOIs was close to the 2008 Robeson upper bound for CO₂/CH₄ and O₂/N₂ gas pairs, showing promise in the field of gas separation.

成功合成了含有螺双苯并恶唑支架结构的新型二胺。这些二胺与商业 4,4'-(六氟异亚丙基) 二邻苯二甲酸酐 (6FDA) 和环己烷二酐 (H'PMDA) 均聚以制备一系列基于苯并恶唑的聚酰亚胺 (PBOIs)。所获得的 PBOI 表现出良好的有机溶解性和出色的热性能，包括355-400 ℃的玻璃化转变温度 ( T _{g ) 和 5% 的热分解温度 (} T _d5%) 的 474–490 °C。同时，这些聚合物薄膜表现出优异的机械强度，例如79.4-92.1 MPa的拉伸强度和19.5%~31.2%的断裂伸长率。此外，这种 PBOI 已被证明是一种新型微孔聚合物，孔径分布为 5-7 Å，BET 表面积为 281-378 m ² /g。基于 H'PMDA 的 PBOI 的渗透率-选择性关系接近于2008 年对 CO ₂ /CH ₄和 O ₂ /N _{2气体对的}Robeson 上限，显示出在气体分离领域的前景。