Ultrathin-film composite membrane based on thermally rearranged poly(benzoxazole-imide) copolymer, and production method therefor

A technology of benzoxazole and thermal rearrangement polymerization, which is applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve problems such as unconsidered and undisclosed organic solvent separation performance, and achieves high power density, excellent thermal Stability, effect of excellent organic solvent nanofiltration performance

Inactive Publication Date: 2018-12-21
IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of thermally rearranged poly(benzoxazole-imide) copolymer membranes as an organic Solvent Nanofiltration Membrane (Non-Patent Document 1)

Method used

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  • Ultrathin-film composite membrane based on thermally rearranged poly(benzoxazole-imide) copolymer, and production method therefor
  • Ultrathin-film composite membrane based on thermally rearranged poly(benzoxazole-imide) copolymer, and production method therefor
  • Ultrathin-film composite membrane based on thermally rearranged poly(benzoxazole-imide) copolymer, and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0124] [Synthesis Example 1] Synthesis of hydroxyl-containing polyimide-polyimide copolymer

[0125] Dissolve 5.0mmol of 3,3'-diamino-4,4'-dihydroxybiphenyl (HAB) and 5.0mmol of 4,4'-diaminodiphenyl ether (ODA) in 10mL of anhydrous NMP and cool to 0° C., and then 10.0 mmol of 4,4′-oxydiphthalic anhydride (ODPA) dissolved in 10 mL of anhydrous NMP was added. After stirring the reaction mixture at 0° C. for 15 min, the temperature was raised to room temperature and left overnight to obtain a polyamic acid viscous solution. Next, 20 mL of ortho-xylene (ortho-xylene) was added to the polyamic acid solution, followed by vigorous stirring and heating, and imidization at 180° C. for 6 h. During this process, the water liberated by the formation of imide rings was separated as an azeotropic mixture of xylenes. The brown solution thus obtained was cooled to room temperature, precipitated in distilled water, washed several times with warm water, and dried in a convection oven at 120° ...

Embodiment 1

[0136] [Example 1] Preparation of thermally rearranged poly(benzoxazole-imide) copolymer support (electrospun membrane)

[0137] By the ODPA-HAB that synthetic example 1 obtains 5 -ODA 5 Dissolved in dimethyl acetamide (DMAc) to prepare a 10 wt% solution. Next, 6 mL of the polymer solution was filled in a 10 mL syringe equipped with a 23G needle, and the syringe was installed on the syringe pump of the electrospinning device (ES-robot, NanoNC Company, Korea), and then, according to the conventional electrospinning method, Spinning under silk conditions to obtain electrospun membranes (HPI). The obtained above-mentioned electrospun membrane was placed between an alumina plate and a carbon cloth, and the temperature was raised to 400°C at a rate of 3°C / min in a high-purity argon atmosphere, and then kept in an isothermal state at 400°C for 2 hours. Thermal rearrangement was performed, thereby preparing a thermally rearranged poly(benzoxazole-imide) copolymer electrospun membr...

Embodiment 2 to 9

[0140] [Example 2 to 9] Preparation of thermally rearranged poly(benzoxazole-imide) copolymer support (electrospun membrane)

[0141] A thermally rearranged poly(benzoxazole-imide) copolymer electrospun membrane was prepared by the same method as in Example 1 using the samples obtained from Synthesis Examples 2 to 9, and obtained by figure 1 As shown, according to the preparation process of the porous thermally rearranged poly(benzoxazole-imide) copolymer support body (electrospun membrane) and the figure of scanning electron microscope (SEM) according to the above-mentioned embodiments 1 to 9, it can be Porous electrospun membranes in nanofiber morphology were confirmed to have been fabricated.

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Abstract

The invention relates to an ultrathin-film composite membrane based on a thermally rearranged poly(benzoxazole-imide) copolymer and a production method therefor and to a technique for forming a poroussupport by means of a thermally rearranged poly(benzoxazole-imide) copolymer and then producing, on the porous support, an ultrathin-film composite membrane comprising a thin-film active layer. The ultrathin-film composite membrane produced according to the invention has excellent thermal/chemical stability and mechanical physical properties, thus is not only capable of withstanding high operating pressure, but also capable of minimizing internal concentration polarization and thereby obtaining high water permeability and, as a result, high power density, and thus can be applied to a pressure-retarded osmosis or forward osmosis process. Further, said ultrathin-film composite membrane has excellent chemical/thermal stability against organic solvents, has superior organic solvent nanofiltration performance, particularly maintains nanofiltration performance stably even under a high-temperature organic solvent condition, and thus can be applied as an organic solvent nanofiltration membrane.

Description

technical field [0001] The present invention relates to a kind of ultra-thin composite membrane based on thermally rearranged (thermally rearranged) poly(benzoxazole-imide) copolymer and preparation method thereof, relate to a kind of by thermally rearranged poly(benzoxazole-imide) in more detail (oxazole-imide) copolymer to form a porous support (porous support) and prepare a composite membrane comprising an active layer of a thin film on the porous support, and apply the composite membrane to pressure retarded osmosis, positive Osmosis or organic solvent nanofiltration process technology. Background technique [0002] In recent years, salinity difference power generation using seawater osmotic pressure to generate energy has attracted attention, and in particular, pressure retarded osmosis process (pressure retarded osmosis process) has been actively studied. The pressure-delayed osmosis process is a power generation method that uses the osmotic pressure difference of two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D71/64B01D71/56B01D67/00B01D61/00C02F1/44
CPCB01D61/002B01D61/027B01D67/0018B01D67/0093B01D69/122B01D71/56B01D71/64B01D2323/30B01D2323/39B01D2325/04B01D2325/20B01D2325/22B01D2325/24B01D2325/30C02F1/44B01D69/087B01D2323/02B01D2323/08B01D2323/14
Inventor 李永茂金志勋李潒朴相泫文宣周姜娜莱李钟明金柱成郑俊泰
Owner IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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