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CN-118979339-B - Flexible nylon 11 piezoelectric separation fiber membrane with adjustable structure, and preparation method and application thereof

CN118979339BCN 118979339 BCN118979339 BCN 118979339BCN-118979339-B

Abstract

The invention discloses a flexible nylon 11 piezoelectric separation fiber membrane with an adjustable structure, a preparation method and application thereof. The preparation method comprises the steps of (1) adding nylon 11 particles and inorganic nano fillers into a cosolvent system for reaction to obtain a homogeneous matrix solution A, (2) adding nylon 11 particles and polyethylene glycol into the cosolvent system for reaction to obtain a homogeneous matrix solution B, and (3) defoaming the homogeneous matrix solution A and the homogeneous matrix solution B, and then forming a membrane through coaxial electrostatic spinning to obtain the flexible nylon 11 piezoelectric separation fiber membrane with an adjustable structure. The invention has the advantages of simple technology, flexible and light weight, changeable and controllable structure, adjustable piezoelectric active crystal phase and high power and electricity output performance, effectively solves the problems of limited mechanical property, poor flexibility, easy folding, large volume ratio, difficult control of structure, low power and electricity output and the like of the traditional material, and has great potential application prospect in energy storage equipment, emergency energy supply and microminiature intelligent wearable energy system.

Inventors

  • ZHANG CHUHONG
  • Wei Xingneng
  • LIU XINGANG
  • WANG QI
  • ZHANG XUAN

Assignees

  • 四川大学

Dates

Publication Date
20260508
Application Date
20240806

Claims (8)

  1. 1. The preparation method of the flexible nylon 11 piezoelectric separation fiber membrane with an adjustable structure is characterized by comprising the following steps of: (1) Adding the nylon 11 particles and the inorganic nano-filler into a cosolvent system for reaction to prepare a homogeneous matrix solution A, wherein the mass ratio of the nylon 11 particles to the inorganic nano-filler is 1-2:0-0.5, and the cosolvent system comprises an organic proton acid solvent and a benign solvent in a volume ratio of 1:1-10; The organic protonic acid solvent is at least one of formic acid, acetic acid, propionic acid, oxalic acid, benzoic acid, malonic acid, trichloroacetic acid and trifluoroacetic acid, and the benign solvent is at least one of hexafluoroisopropanol, acetone and dichloromethane; (2) Adding nylon 11 particles and polyethylene glycol into a cosolvent system for reaction to prepare a homogeneous matrix solution B, wherein the mass ratio of the nylon 11 particles to the polyethylene glycol to the cosolvent system is 0-2.5:5-20:5-15; (3) Defoaming treatment is carried out on the homogeneous matrix solution A and the homogeneous matrix solution B, and then coaxial electrostatic spinning is carried out to form a film, so that the flexible nylon 11 piezoelectric separation fiber film with an adjustable structure is prepared.
  2. 2. The method according to claim 1, wherein the mass ratio of the nylon 11 particles to the cosolvent system in the step (1) is 1:1-5.
  3. 3. The method of claim 1, wherein the inorganic nanofiller is at least one of nano barium titanate, nano zinc oxide, lead zirconate titanate, carbon nanotubes, and graphene nanoplatelets.
  4. 4. The method according to claim 1, wherein the reaction temperature in the step (1) and the step (2) is 25 to 70 ℃ and the stirring speed is 200 to 600 rpm.
  5. 5. The method according to claim 1, wherein the coaxial electrospinning process in step (3) is: the solution in the pushing injection A is a homogeneous matrix solution B, and the speed is 1.0-2.5 mL/h; The solution in the pushing injection B is a homogeneous matrix solution A, and the speed is 2.0-7.5 mL/h; the axial distance from the needle to the roll shaft is 5-15 cm; the rotating speed of the receiver roller is 30-500 rpm; the positive voltage is 12-18V, and the negative voltage is-1.0 to-1.5V.
  6. 6. A structurally adjustable flexible nylon 11 piezoelectric separation fiber membrane, which is characterized by being prepared by the method of any one of claims 1-5.
  7. 7. The use of the flexible nylon 11 piezoelectric separation fiber membrane of claim 6 in the preparation of flexible energy harvesting devices and energy storage devices.
  8. 8. A lithium ion battery, wherein the flexible nylon 11 piezoelectric separation fiber membrane according to claim 6 is used as a separator between a positive electrode material and a negative electrode material.

Description

Flexible nylon 11 piezoelectric separation fiber membrane with adjustable structure, and preparation method and application thereof Technical Field The invention belongs to the field of energy harvesting materials and energy storage battery devices, and particularly relates to a flexible nylon 11 piezoelectric separation fiber membrane with an adjustable structure, a preparation method and application thereof, which are mainly applied to the fields of energy harvesting devices, energy storage batteries, emergency energy supply, microminiature intelligent wearable energy systems and the like. Background Nylon 11, the most studied member of the odd nylon family, is a promising functional material for future electronic devices or energy storage systems. However, nylon 11 produced by conventional means such as coating, casting and single/biaxial stretching is mostly a two-dimensional structure such as a planar film or a block, and cannot exert its effective piezoelectric output performance. Therefore, it is important to optimize or design the structural material in a higher dimension by structure. The electrostatic spinning technology can be used for preparing devices with a first, a second and a three-dimensional structures, and has the advantages of simple operation, controllable conditions, low cost and the like. In addition, the fiber structure such as porous, hollow and other structures can be regulated by precisely controlling the spinning condition and the electrostatic spinning post-treatment, and the fiber performance is optimized, so that the customized application is achieved. But the most stable non-piezoelectric/ferroelectric alpha phase is inevitably formed during electrospinning to spin nylon 11 fibers. The development of flexible power supplies is a promising strategy to solve the problem of wearable electronic devices working without a power supply or charging base. A flexible self-charging battery is an energy storage device that synchronously collects and stores energy through force-to-electricity conversion with a piezoelectric effect. The piezoelectric diaphragm has double functions, on one hand, the diaphragm serving as a battery has the function of preventing the battery from being short-circuited, and on the other hand, the piezoelectric diaphragm can serve as piezoelectric electrolyte to provide piezoelectric potential for driving ion migration in an internal circuit so as to achieve the effect of self-charging. At present, no study report on nylon 11 for flexible self-charging batteries has been made. Disclosure of Invention Aiming at the defects in the prior art, the invention provides the flexible nylon 11 piezoelectric separation fiber membrane with an adjustable structure, the preparation method and the application thereof, and the flexible nylon 11 piezoelectric separation fiber membrane has the advantages of simple technology, flexibility, light weight, changeable and controllable structure, controllable piezoelectric active crystalline phase, high power output performance and portability and self-power supply, and the prepared flexible self-charging battery has great potential application prospect in energy storage equipment, emergency energy supply and microminiature intelligent wearable energy systems. In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a flexible nylon 11 piezoelectric separation fiber membrane with an adjustable structure comprises the following steps: (1) Adding nylon 11 particles and inorganic nano fillers into a cosolvent system for reaction to prepare a homogeneous matrix solution A; (2) Nylon 11 particles and polyethylene glycol are added into a cosolvent system for reaction to prepare a homogeneous matrix solution B; (3) Defoaming treatment is carried out on the homogeneous matrix solution A and the homogeneous matrix solution B, and then coaxial electrostatic spinning is carried out to form a film, so that the flexible nylon 11 piezoelectric separation fiber film with an adjustable structure is prepared. Further, the nylon 11 particles are commercially available products such as RTP nylon 11, french Acoman nylon 11BESMOTL, etc. Further, in the step (1), the mass ratio of the nylon 11 particles to the cosolvent system is 1:1-5, and the mass ratio of the nylon 11 particles to the inorganic nanofiller is 1-2:0-0.5. Further, in the step (2), the mass ratio of the nylon 11 particles to the polyethylene glycol to the cosolvent system is 0-2.5:5-20:5-15. Further, the cosolvent system comprises an organic proton acid solvent and a benign solvent in a volume ratio of 1:1-10. Further, the organic protonic acid solvent is at least one of formic acid, acetic acid, propionic acid, oxalic acid, benzoic acid, malonic acid, trichloroacetic acid and trifluoroacetic acid; the benign solvent is at least one of hexafluoroisopropanol, acetone and methylene chloride.