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Composite fiber membrane and preparing method and application thereof

A technology of composite fiber membrane and composite fiber, which is applied in fiber treatment, spinning solution preparation, textile and papermaking, etc., can solve the problems such as the decrease of mechanical strength of the film, and achieve simple preparation method, remarkable effect, good dimensional stability and durability thermal effect

Active Publication Date: 2017-06-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the proton conduction efficiency by increasing the phosphoric acid doping content and reducing the film thickness will lead to a decrease in the mechanical strength of the film

Method used

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  • Composite fiber membrane and preparing method and application thereof
  • Composite fiber membrane and preparing method and application thereof
  • Composite fiber membrane and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1g poly(2,2`-(m-phenyl)5,5`-bibendazole) (mPBI) was dissolved in 15.7g N,N'-dimethylacetamide to prepare a solid content of 6.0wt% 0.01 g of polyoxyethylene was added as a carrier to prepare the spinning solution of polybenzimidazole. 1g of polyvinylidene fluoride (PVDF) was dissolved in 4g of N,N'-dimethylacetamide to prepare a clear spinning solution with a solid content of 20.0wt%. Cover the electrospinning receiving roller with aluminum foil, transfer 5mL mPBI and 5mL PVDF spinning solution into the electrospinning tube respectively, and fix them on both sides of the electrospinning receiving roller, and set the distance from the spinneret to the cathode to the cathode. Set at 20cm, advance speed at 0.04mL / min, spinning voltage at 20KV, use electrospinning tube needle as anode and aluminum foil as cathode to collect two kinds of nanofibers at the same time until all liquid is spun completely. Put the aluminum foil and the collected composite fibers in the steam of ...

Embodiment 2

[0037] 1g of mPBI was dissolved in 15.7g of N,N'-dimethylacetamide to prepare a clear solution with a solid content of 6.0wt%, and 0.01g of polyoxyethylene was added as a carrier to prepare a polybenzimidazole spinning solution. 1g of PVDF was dissolved in 4g of N,N'-dimethylacetamide to prepare a clear spinning solution with a solid content of 15wt%. Wrap the electrospinning receiving roll with aluminum foil, divide 10mL mPBI into two equal parts and transfer them to two electrospinning tubes, and place them on one side of the electrospinning roll; transfer 5mL PVDF spinning liquid to the built-in electrospinning tube On the other side of the electrospinning receiving roller, the distance from the spinneret to the cathode to the cathode is set to 20cm, the advancing speed is 0.04mL / min, and the spinning voltage is 20KV. The needle of the electrospinning tube is used as the anode, and the aluminum foil is used as the cathode. Both nanofibers were collected until the entire liq...

Embodiment 3

[0039]1g of mPBI was dissolved in 15.7g of N,N'-dimethylacetamide to prepare a clear solution with a solid content of 6.0wt%, and 0.01g of polyoxyethylene was added as a carrier to prepare a polybenzimidazole spinning solution. Dissolve 1g of PVDF in 4g of N,N'-dimethylacetamide to prepare a clear spinning solution with a solid content of 15wt%. Wrap the electrospinning receiving roll with aluminum foil, divide 10mL mPBI into two equal parts and transfer to two electrospinning tubes, place on one side of the electrospinning roll; transfer 2.5mL PVDF spinning solution to the electrospinning tube Built into the other side of the electrospinning receiving roller, the distance from the spinneret to the cathode to the cathode is set to 20cm, the advancing speed of the mPBI solution is set to 0.04mL / min, the advancing speed of the PVDF solution is 0.02mL / min, and the spinning voltage is 16.6 - 21KV, the needle of the electrospinning tube is used as the anode, and the aluminum foil i...

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Abstract

The invention discloses a composite fiber membrane. The composite fiber membrane is formed by one or two above of polybenzimidazole polymerized by one of a PBI unit and one or two above of a supporting polymer; polybenzimidazole fibers and supporting polymer fibers are microscopically of interpenetration interweaving network structures, and nodes are arranged between interwoven fibers; the molecular weight of the polybenzimidazole is 6 ten thousand to 20 ten thousand; the molecular weight of the supporting polymer is 2 ten thousand to 100 ten thousand; the quality content of the supporting polymer in a composite fiber proton exchange membrane is 5 wt.% to 80 wt.%. The proton conduction capacity is provided for PBI by doping phosphoric acid, and when the thickness of an electrolyte membrane is low, and the proton conductivity is high, the proton conduction efficiency is highest. Descending of the mechanical strength of the membrane can be caused when the proton conduction efficiency is improved by adding the doping content of the phosphoric acid and reducing the thickness of the membrane. For solving contradictions between the mechanical strength and the thickness of the membrane, an effective way that the supporting polymer fibers with the good mechanical strength are led into the membrane is achieved.

Description

technical field [0001] The invention belongs to the field of polymer materials; specifically, it relates to a composite fiber membrane and an electrospinning preparation method thereof; [0002] The invention also relates to phosphoric acid doped composite fiber membrane and its preparation and application. Background technique [0003] High-temperature proton exchange membrane fuel cells have broad application prospects in the field of portable and power sources due to their strong resistance to CO poisoning and simple system structure. High-temperature proton exchange membrane fuel cells based on phosphoric acid-doped polybenzimidazole (PBI) are more mature than other high-temperature systems. Phosphoric acid doped PBI is considered to be the most likely polymer electrolyte membrane to replace Nafion, due to its high proton conductivity and physical and chemical stability under high temperature and anhydrous conditions. However, so far, PBI-based phosphoric acid-doped hi...

Claims

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Application Information

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IPC IPC(8): D04H1/728D01D1/02D01D5/00D06M11/70H01M8/0202
CPCD01D1/02D01D5/003D04H1/728D06M11/70H01M8/0202Y02E60/50
Inventor 孙公权马文佳王素力杨丛荣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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