Fluorinated polybenzimidazopyrrolones with excellent alkaline‐hydrolysis resistance |
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Authors: | Liming Tao Haixia Yang Jingang Liu Lin Fan Shiyong Yang |
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Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China;2. Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China |
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Abstract: | Two novel aromatic tetraamines containing bulky lateral phenyl unit and multiple trifluoromethyl groups, 1,1‐bis4‐(3′,4′‐diaminophenoxy)phenyl]‐1‐(3″‐trifluoromethylphenyl)?2,2,2‐trifluoroethane (6FTA) and 1,1‐bis4‐(3′,4′‐diaminophenoxy)phenyl]‐1‐3″,5″‐bis(trifluoromethyl)phenyl]‐2,2,2‐trifluoroethane (9FTA) were synthesized and characterized. A series of fluorinated aromatic polybenzimidazopyrrolones (polypyrrolones, PPys) were synthesized via a two‐step polycondensation procedure. The inherent viscosities of the precursors, poly(amide amino acid) (PAAA), ranged from 0.39 dL/g to 0.54 dL/g. All the FPPys were amorphous. The freestanding FPPy films could be prepared, which exhibited good thermal stability with the glass transition temperature of 315–389°C, the temperatures of 5% weight loss (T5%) of 497–535°C in nitrogen and residual weight retention at 700°C over 60%. All the FPPy films exhibited excellent alkaline‐hydrolysis resistance which retained their original shapes and toughness after boiling 7 days in 10% sodium hydroxide solution. Also after boiling 8 h in 10% sodium hydroxide solution, the tensile strength could retain as high as 56% of the original values. The alkaline‐hydrolysis resistance was much better than the polyimides which had similar chemical structures. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131, 40041. |
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Keywords: | polyimides polycondensation films |
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