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Electrospun Polyimide Ultrafine Non-woven Fibrous Membranes Containing Phenyl-substituted Quinoxaline Units with Improved Hydrolysis Resistance for Potential Applications in High-temperature Water Environments
Fibers and Polymers ( IF 2.2 ) Pub Date : 2021-08-10 , DOI: 10.1007/s12221-021-0403-5
Lu-meng Yin 1 , Ming-wei Yang 1 , Quan Liu 1 , Xiang Li 1 , Yan Zhang 1 , Xin-Xin Zhi 1 , Hao-ran Qi 1 , Jin-gang Liu 1 , Feng-zhu Lv 1
Affiliation  

Two organo-soluble polyimide resins containing phenyl-substituted quinoxaline units (PIPQ) were successfully prepared via the two-step chemical imidization procedure from an aromatic diamine, 6(7)-amino-2-(4-aminophenyl)-3-phenylquinoxaline (PQDA) and aromatic dianhydrides with flexible molecular structures. The derived PIPQ-1 resin from PQDA and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and the PIPQ-2 resin from PQDA and 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) were all soluble in polar aprotic solvents, such as N-methyl-2-pyrrolidone (NMP) and N,N-dimethylacetamide (DMAc). The PIPQ/DMAc solutions with the solid contents of 25–35 wt% were used as the starting mediums and the PIPQ ultrafine non-woven fibrous membranes (UFMs) were successfully prepared by the one-step electrospinning (ES) procedure. For comparison, the standard polyimide reference electrospun UFM (PI-ref) was also fabricated via the two-step ES procedure from the soluble poly(amic acid) (PAA) precursor based on pyromellitic anhydride (PMDA) and 4,4′-oxydianiline (ODA), followed by thermal imidization at elevated temperatures from 80–300 °C. The fabricated PIPQ UFMs exhibited good thermal stability with the 5 % weight loss temperatures (T5%) of 537 °C for PIPQ-1 (6FDA-PQDA) and 517 °C for PIPQ-2 (BPADA-PQDA) in nitrogen, respectively. In addition, the PIPQ UFMs exhibited glass transition temperatures (Tg) higher than 252 °C. Meanwhile, the PIPQ UFMs exhibited improved optical properties with the reflectance values over 75 % at the wavelength of 457 nm and high whiteness. At last, the PIPQ UFMs showed greatly enhanced hydrolysis stability in highly alkaline aqueous solution (sodium hydroxide in water, 20 wt%) either at room temperature or at elevated temperature. The PIPQ UFMs survived even during the aging in boiling aqueous sodium hydroxide solution (concentration: 20 wt%) for 3 h while the PI-ref UFM totally hydrolyzed during the test.



中文翻译:

含有苯基取代喹喔啉单元的电纺聚酰亚胺超细无纺纤维膜具有改进的耐水解性,可用于高温水环境中的潜在应用

通过两步化学酰亚胺化过程,从芳香族二胺 6(7)-氨基-2-(4-氨基苯基)-3-苯基喹喔啉中成功制备了两种含有苯基取代喹喔啉单元 (PIPQ) 的有机可溶性聚酰亚胺树脂。 PQDA) 和具有灵活分子结构的芳香族二酐。来自 PQDA 和 4,4'-(六氟异亚丙基)二邻苯二甲酸酐 (6FDA) 的衍生 PIPQ-1 树脂以及来自 PQDA 和 2,2-双[4-(3,4-二羧基苯氧基)苯基]丙烷二酐的 PIPQ-2 树脂(BPADA) 均溶于极性非质子溶剂,如N-甲基-2-吡咯烷酮 (NMP) 和N,N-二甲基乙酰胺(DMAc)。以固含量为 25-35 wt% 的 PIPQ/DMAc 溶液为起始介质,通过一步静电纺丝 (ES) 程序成功制备了 PIPQ 超细无纺纤维膜 (UFM)。为了进行比较,标准聚酰亚胺参考电纺 UFM (PI-ref) 也通过两步 ES 程序从基于均苯四酸酐 (PMDA) 和 4,4'-氧化二苯胺的可溶性聚酰胺酸 (PAA) 前体制造(ODA),然后在 80–300 °C 的高温下进行热酰亚胺化。制造的 PIPQ UFM 在 5% 失重温度 ( T 5%) 在氮气中的 PIPQ-1 (6FDA-PQDA) 和 PIPQ-2 (BPADA-PQDA) 分别为 537 °C 和 517 °C。此外,PIPQ UFMS表现出玻璃化转变温度(Ť)高于252℃。同时,PIPQ UFM 表现出改进的光学性能,在 457 nm 波长处的反射率值超过 75%,白度高。最后,在室温或高温下,PIPQ UFM 在强碱性水溶液(氢氧化钠水溶液,20 wt%)中显示出大大增强的水解稳定性。即使在沸腾的氢氧化钠水溶液(浓度:20 wt%)中老化 3 小时,PIPQ UFM 也能存活,而 PI-ref UFM 在测试过程中完全水解。

更新日期:2021-08-10
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