Electrospun Polyimide Ultrafine Non-woven Fibrous Membranes Containing Phenyl-substituted Quinoxaline Units with Improved Hydrolysis Resistance for Potential Applications in Hightemperature Water Environments 


Vol. 23,  No. 1, pp. 37-47, Jan.  2022
10.1007/s12221-021-0403-5


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  Abstract

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 oC. The fabricated PIPQ UFMs exhibited good thermal stability with the 5 % weight loss temperatures (T5 %) of 537 oC for PIPQ- 1 (6FDA-PQDA) and 517 oC for PIPQ-2 (BPADA-PQDA) in nitrogen, respectively. In addition, the PIPQ UFMs exhibited glass transition temperatures (Tg) higher than 252 oC. 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.

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  Cite this article

[IEEE Style]

L. Yin, M. Yang, Q. Liu, X. Li, null, Y. Zhang, X. Zhi, H. Qi, J. Liu, F. Lv, "Electrospun Polyimide Ultrafine Non-woven Fibrous Membranes Containing Phenyl-substituted Quinoxaline Units with Improved Hydrolysis Resistance for Potential Applications in Hightemperature Water Environments," Fibers and Polymers, vol. 23, no. 1, pp. 37-47, 2022. DOI: 10.1007/s12221-021-0403-5.

[ACM Style]

Lu-meng Yin, Ming-wei Yang, Quan Liu, Xiang Li, null, Yan Zhang, Xin-Xin Zhi, Hao-ran Qi, Jin-gang Liu, and Feng-zhu Lv. 2022. Electrospun Polyimide Ultrafine Non-woven Fibrous Membranes Containing Phenyl-substituted Quinoxaline Units with Improved Hydrolysis Resistance for Potential Applications in Hightemperature Water Environments. Fibers and Polymers, 23, 1, (2022), 37-47. DOI: 10.1007/s12221-021-0403-5.

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pISSN : 1229 - 9197
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