Zhou Jiabei, Zhong Xianzhu, Takada Kenji, Okajima Maiko K, Yamaguchi Masayuki, Kaneko Tatsuo
Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi 923-1292, Japan.
Key Laboratory of Synthetic and Biological Colloids, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Ave., Wuxi 214122, China.
Langmuir. 2024 Nov 12;40(45):23780-23787. doi: 10.1021/acs.langmuir.4c02745. Epub 2024 Oct 31.
Polybenzimidazoles are one of the most thermally and chemically stable polymers due to their rigid chemical structure with π-π stacking and conjugated bonding. Poly(2,5-benzimidazole) (ABPBI), the simplest structure of polybenzimidazole, was synthesized, but the cast film was not homogeneous and featured thick brown areas, which limited their further application. Silica nanospheres were adapted as porogen to generate nanopores in the ABPBI film by successive etching with hydrofluoric acid. As a result of air-composite formation, the ABPBI film became homogeneous and its surface roughness was reduced from 10.0 to 2.5 nm. The obtained air-composite ABPBI film had more favorable mechanical properties than the original film. An air-composite film prepared with 50 wt % silica content had a tensile strength of 128 MPa and an elongation at break of 23%, both of which values were approximately twice as high as the corresponding values of the original film.
聚苯并咪唑是热稳定性和化学稳定性最高的聚合物之一，这归因于其具有π-π堆积和共轭键的刚性化学结构。聚（2,5-苯并咪唑）（ABPBI）是聚苯并咪唑中结构最简单的一种，已被合成出来，但流延膜不均匀，有厚的棕色区域，这限制了它们的进一步应用。二氧化硅纳米球被用作致孔剂，通过氢氟酸连续蚀刻在ABPBI膜中产生纳米孔。由于形成了空气复合结构，ABPBI膜变得均匀一致，其表面粗糙度从10.0纳米降低到2.5纳米。所得的空气复合ABPBI膜比原始膜具有更优异的机械性能。用50 wt%二氧化硅含量制备的空气复合膜的拉伸强度为128 MPa，断裂伸长率为23%，这两个值大约是原始膜相应值的两倍。
