Abstract
A series of co-polyimides (co-PIs) containing pyrimidine rings were synthesized by reacting the self-synthesized diamine 2,5-bis(4-aminophenyl)-pyrimidine (PRM) with commercial 4,4’-diaminodiphenyl ether (ODA) and aromatic 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA). A series of co-PI fibers were produced using a two-step wet-spinning method, including extrusion, coagulation, washing, drying, thermal imidization and hot-drawing processes. Orientation structures of the precursor co-PAA fibers formed in the wet-spinning process, and their effects on the thermomechanical properties of the as-spun co-PI fibers were discussed. An interesting phenomenon has been found that glass transition temperatures (T gs) of as-spun co-PI fibers decreased with increasing orientation factors, which was explained based on some previous works. Two-dimensional wide-angle X-ray diffraction spectra of the final co-PI fibers showed that samples with higher PRM contents show highly oriented and well-ordered crystalline structures, which account for the enhanced mechanical properties when incorporating PRM moieties. The co-PI fiber with the PRM/ODA molar ratio of 6/4 showed an optimum tensile strength and modulus of 3.1 and 90 GPa, respectively, showing a great potential in light advanced composites.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (No. 51233001), 973 plan (2014CB643603), Shanghai Science and Technology Innovation Action Plan (16JC1403600), Textile Vision Basic Research Project (J201602) and Shanghai Science and Technology Commission “Yangfan” Program (17YF1400500).
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Gan, F., Dong, J., Tan, W. et al. Fabrication and characterization of co-polyimide fibers containing pyrimidine units. J Mater Sci 52, 9895–9906 (2017). https://doi.org/10.1007/s10853-017-1099-1
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DOI: https://doi.org/10.1007/s10853-017-1099-1