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首页> 外文期刊>Journal of Applied Polymer Science >Fluorinated Polybenzimidazopyrrolones with Excellent Alkaline-Hydrolysis Resistance
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Fluorinated Polybenzimidazopyrrolones with Excellent Alkaline-Hydrolysis Resistance

机译：耐碱性水解性优异的氟化聚苯并咪唑并吡咯烷酮

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摘要

Two novel aromatic tetraamines containing bulky lateral phenyl unit and multiple trifluoromethyl groups, 1,1-bis[4-(3',4'-diaminophenoxy)phenyl]-1-(3"-trifluoromethylphenyl)22,2,2-trifluoroethane (6FTA) and 1,1-bis[4-(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℃, the temperatures of 5% weight loss (T5%) of 497-535℃ in nitrogen and residual weight retention at 700℃ 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.
机译：两种新颖的芳香四胺，均含有庞大的侧向苯基单元和多个三氟甲基，即1,1-双[4-（3'，4'-二氨基苯氧基）苯基] -1-（3“-三氟甲基苯基）22,2,2-三氟乙烷（ 6FTA）和1,1-双[4-（3'，4'-二氨基苯氧基）苯基] -1- [3“，5”-双（三氟甲基）苯基] -2,2,2-三氟乙烷（9FTA）通过两步缩聚反应合成了一系列氟化芳族聚苯并咪唑并吡咯烷酮（聚吡咯烷酮，PPys），其前体的固有粘度（酰胺氨基酸）（PAAA）的粘度为0.39 dL / g至0.54。 dL / g。所有的FPPys均为无定形，可以制备独立的FPPy薄膜，具有良好的热稳定性，玻璃化温度为315-389℃，失重5％（T5％）为497-535℃ FPPy薄膜具有优异的耐碱性水解性，并保持了原有的形状和韧性在10％的氢氧化钠溶液中煮沸7天后，再加水。同样在10％的氢氧化钠溶液中沸腾8小时后，拉伸强度仍可保持高达原始值的56％。耐碱水解性比具有相似化学结构的聚酰亚胺要好得多。

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