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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

Electrospun Polyimide Ultrafine Non-woven Fibrous Membranes Containing Phenyl-substituted... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

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

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References (40)

Publisher
Springer Journals
Copyright
Copyright © The Korean Fiber Society 2021
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/s12221-021-0403-5
Publisher site
See Article on Publisher Site

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 °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.

Journal

Fibers and Polymers – Springer Journals

Published: Jan 1, 2022

Keywords: Polyimide; Phenylquinoxaline; Electrospinning; Membranes; Alkaline stability

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