Preparation and gas separation properties of spirobisbenzoxazole-based polyimides. (15th June 2022)

• Record Type: Journal Article
• Authors: Chen, Haiquan; Dai, Fengna; Wang, Mengxia; Yan, Xiaoying; Ke, Zhao; Chen, Chunhai; Qian, Guangtao; Yu, Youhai
• Is Part Of: European polymer journal. Volume 173(2022)
• Publication Date: 2022-06-15
• Subjects: Polyimide -- PIM -- Gas separation; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2022.111231
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Novel spirobisbenzoxazole-based polyimides of intrinsic microporosity were prepared. The polyimides showed good solubility, excellent thermal and mechanical properties. Discuss the rotation restriction and thermal annealing process on gas permeation behavior. Abstract: Improving the processability and permeability of aromatic polyimides is a prerequisite for promoting the application in the field of gas separation membranes. Here, a series of novel spirobisbenzoxazole-based polyimides were synthesized. The novel spirobisbenzoxazole unit showed a larger rigid step size than the reported spirobisindane unit, which more effectively destroyed the molecular packing. As a result, the obtained aromatic polyimides showed good organic solubility and significantly improved gas permeability. Such polyimides were also considered as polymers of intrinsic microporous (PIMs) with ultra-micropore distribution of 5 ∼ 7 Å and high BET surface areas ranging from 373 to 449 m 2 /g. Meanwhile, the obtained polyimide membranes exhibited excellent thermal properties ( T g > 400 °C) and outstanding mechanical properties ( σ > 100 MPa). The effects of rotation restriction and thermal annealing process on gas permeation behavior were also studied.