Abstract
In this work, a fully rigid coplanar symmetric heterocyclic unit was introduced into the rigid polyimide macromolecular backbone structure to prepare high-performance polyimide fibers. The novel co-polyimide (co-PI) fibers based on 3,3’,4,4’-biphenyltetracarboxylic anhydride (BPDA), p-phenylenediamine (PDA) and 2,6-(4,4’-diaminodiphenyl) benzo[1,2-d:5,4-d’] bisoxazole (PBOA) were fabricated via a two-step wet-spinning method. The effects of benzobisoxazole moiety on spinnability, aggregation structure, and mechanical properties of fibers were systematically discussed. The detailed structural analysis revealed that the well-defined aggregation structures of co-PI fibers were obtained from initial amorphous structure when post hot-drawing temperature was higher than 460 °C under proper drawing ratio, and the incorporation PBOA into BPDA-PDA structures produced more compact structural co-PI fiber than homo BPDA-PDA fiber. The BPDA-PDA/PBOA co-PI fibers exhibited optimum tensile strength and modulus of 2.65 and 103 GPa, which increased by 182% and 84% compared to the homo BPDA-PDA fiber, respectively.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51903038 and 21975040) and Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515110897).
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Fang, YT., Gan, F., Dong, J. et al. Preparation of High-performance Polyimide Fibers with Wholly Rigid Structures Containing Benzobisoxazole Moieties. Chin J Polym Sci 40, 280–289 (2022). https://doi.org/10.1007/s10118-022-2666-8
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DOI: https://doi.org/10.1007/s10118-022-2666-8